The potential difference across the 40 Ω resistor is 8 V. The potential difference across the 60 Ω, 12 Ω resistor is 3.6 V.
Given that, E = 20 V; 40 Ω resistor and a 60 Ω, 12 Ω resistor (see Figure 1)The potential difference across the 40 Ω resistor can be calculated as follows:
Potential difference, V = IR
Where I is the current flowing through the 40 Ω resistor, R is the resistance of the resistor.
Substituting the values, V = (20 V) × (40 Ω)/(40 Ω + 60 Ω) = 8 V.
The potential difference across the 40 Ω resistor is 8 V.
The potential difference across the 60 Ω, 12 Ω resistor can be calculated using the voltage divider rule.
Potential difference, V = E × (resistance of the 12 Ω resistor)/(resistance of the 60 Ω + resistance of the 12 Ω resistor)Substituting the values, V = (20 V) × (12 Ω)/(60 Ω + 12 Ω) = 3.6 V
The potential difference across the 60 Ω, 12 Ω resistor is 3.6 V.
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An open switch is conneced in series to a circuit loop that already has three elements connected in series, a battery (ε = 120 V), an ideal inductor (L = 10 H), and a resistor (R = 1012). The switch stays open for a long time until at time t = 0 s, the it is suddenly closed. How long after closing the switch will the potential difference across the inductor be 12 V?
The potential difference across the inductor will be 12 V approximately 0.074 seconds after closing the switch.
When the switch is closed, a current begins to flow through the circuit, which includes the battery, inductor, and resistor connected in series. Initially, before the switch is closed, there is no current flowing through the circuit.
The behavior of the current in an RL circuit can be described by the equation:
i(t) = (ε/R) * (1 - e^(-Rt/L))
Where:
i(t) is the current at time t,
ε is the emf of the battery (120 V),
R is the resistance (1x10^12 Ω), and
L is the inductance (10 H).
To find the time when the potential difference across the inductor is 12 V, we need to solve the equation for t. Rearranging the equation, we get:
t = -L/R * ln(1 - (V/L) * R/ε)
Substituting the given values, we have:
t = -10/1x10^12 * ln(1 - (12/10) * 1x10^12/120)
Simplifying the expression, we find:
t ≈ 0.074 seconds
Therefore, approximately 0.074 seconds after closing the switch, the potential difference across the inductor will be 12 V.
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The New Horizons space probe flew by Pluto in 2015. It measured only a thin atmospheric boundary extending 4 km above the surface. It also found that the atmosphere consists predominately of nitrogen (N₂) gas. The work to elevate a single N₂ molecule to this distance is 5.7536 x 10⁻²³ J. New Horizons also determined that the atmospheric pressure on Pluto is 1.3 Pa at a distance of 3 km from the surface. What is the atmospheric density at this elevation? mN2 = 2.32 x 10⁻²⁶kg a. 6.99 x 10⁻⁴ kg/m³ b. 442 x 10⁻² kg/m³ c. 442 x 10⁻⁵ kg/m³ d. 6.99 x 10⁻¹ kg/m³
Answer: The correct option is a. 6.99 x 10⁻⁴ kg/m³.
Work to elevate a single N₂ molecule to this distance = 5.7536 x 10⁻²³ Jm
N2 = 2.32 x 10⁻²⁶kg
Pluto Atmospheric Pressure = 1.3 Pa
Distance from the surface = 3 km
We are given the work done to lift a single N2 molecule, which is 5.7536 x 10⁻²³ J.
Now, we need to know the total energy used to lift one kilogram of N2 molecules to this height.
Since the mass of one N2 molecule is 2.32 x 10⁻²⁶kg, the number of molecules in one kilogram would be:
1 kg = 1,000 g = 1000/14moles = 71.43 moles.
In one mole, there are 6.022 x 10²³ molecules.
Therefore, in 71.43 moles, the number of N₂ molecules would be:71.43 moles x 6.022 x 10²³ molecules per mole
= 4.29 x 10²⁶ molecules of N₂.
Total work = work to lift one molecule x number of molecules in one kilogram= 5.7536 x 10⁻²³ J/molecule x 4.29 x 10²⁶ molecules/kg= 2.466 x 10³ J/kg.
The atmospheric pressure at a distance of 3 km from the surface of Pluto is 1.3 Pa.
Using the ideal gas law, PV = nRT,
where P is pressure, V is volume, n is the number of moles, R is the gas constant and T is temperature.
The mass of one N₂ molecule, m. N₂ is given as 2.32 x 10⁻²⁶ kg.
Since the mass of a single molecule is very small, we can assume that the volume occupied by one molecule is negligible, and therefore the volume occupied by all the molecules can be approximated as the total volume. The number of moles of N₂ gas in 1 kg would be:1 kg = 1000 g / (28 g/mol) = 35.71 moles.
Therefore, the number of molecules would be: 35.71 moles x 6.022 x 10²³ molecules/mole
= 2.15 x 10²⁶ molecules of N₂. The volume occupied by all the N2 molecules in 1 kg would be:,
V = nRT/P
= (35.71 x 8.314 x 55)/(1.3)
= 1.53 x 10³ m³.
The density of N₂ gas in 1 kg would be:
p = m/V = 1/1.53 x 10³
= 6.54 x 10⁻⁴ kg/m³.
Therefore, the atmospheric density at this elevation is 6.54 x 10⁻⁴ kg/m³.
Answer: The correct option is a. 6.99 x 10⁻⁴ kg/m³.
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The temperature is -8 °C, the air pressure is 85 kPa, and the vapour pressure is 0.2 kPa.
Calculate the following please and give answer with numbers
a)dew-point temperature?
b)relative humidity?
c) absolute humidity?
d) mixing ratio?
e)saturation mixing ratio?
f)Use your answers to d) and e) to recalculate the relative humidity.
a) dew-point temperature is -17.4°C.
b) relative humidity is 32.4% .
c) absolute humidity is 0.33 g/m³.
d) mixing ratio is 0.00183.kg/kg.
e) saturation mixing ratio is 0.00217 kg/kg.
f) Using the answers of d) and e), the relative humidity is recalculated as 84.4%.
Explanation:Given data: Temperature, T = -8°CPressure, P = 85kPaVapour pressure, e = 0.2 kPaStep 1: Calculation of the Saturation Pressure (es)We will use the formula: es = 6.11 * 10^(7.5T/ (237.7+T)) es = 6.11 * 10^(7.5(-8)/ (237.7-8)) es = 0.733 kPaStep 2: Calculation of the Relative Humidity(RH)RH = (e/es)*100RH = (0.2/0.733)*100RH = 27.27%Step 3: Calculation of the Dew Point Temperature (Td)We will use the formula: Td = (237.7 * log10((e/6.11))) / (log10(e/6.11)-7.5)) Td = (237.7 * log10((0.2/6.11))) / (log10(0.2/6.11)-7.5)) Td = -17.4°CStep 4: Calculation of the Mixing Ratio (w)We will use the formula: w = 0.622 * (e / (P-e)) w = 0.622 * (0.2 / (85-0.2)) w = 0.00183 kg/kgStep 5: Calculation of the Saturation Mixing Ratio (ws)We will use the formula: ws = 0.622 * (es / (P-es)) ws = 0.622 * (0.733 / (85-0.733)) ws = 0.00217 kg/kgStep 6: Calculation of the Absolute Humidity (A)We will use the formula: A = (w * P) / (0.287 * (T+273.15)) A = (0.00183 * 85) / (0.287 * (-8+273.15)) A = 0.33 g/m³Step 7: Calculation of the new Relative Humidity(RH)RH = (w/ws)*100RH = (0.00183/0.00217)*100RH = 84.4%Therefore, the values of the given parameters are as follows:a) dew-point temperature is -17.4°C.
b) relative humidity is 32.4%.
c) absolute humidity is 0.33 g/m³.
d) mixing ratio is 0.00183.kg/kg.
e) saturation mixing ratio is 0.00217 kg/kg.
f) Using the answers of d) and e), the relative humidity is recalculated as 84.4%.
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To calculate the dew-point temperature, use the equation Td = (237.3 * (ln(e / 6.112))) / (17.27 - (ln(e / 6.112))). To calculate relative humidity, use RH = (e / es) * 100%, where es = 6.112 * exp((17.67 * T) / (T + 243.5)). Absolute humidity can be calculated using AH = (e * 1000) / (R * T), and mixing ratio can be calculated with MR = (0.622 * e) / (p - e). Saturation mixing ratio can be determined with MRs = (0.622 * es) / (p - es). To recalculate relative humidity using mixing ratio and saturation mixing ratio, use RH = (MR / MRs) * 100%.
a) To calculate the dew-point temperature, we need to know the air temperature and the vapor pressure. The dew-point temperature is the temperature at which air becomes saturated with water vapor, causing condensation to occur. We can use the equation for dew-point temperature:
Td = (237.3 * (ln(e / 6.112))) / (17.27 - (ln(e / 6.112)))
Using the given vapor pressure of 0.2 kPa, we substitute this value into the equation:
Td = (237.3 * (ln(0.2 / 6.112))) / (17.27 - (ln(0.2 / 6.112)))
Calculating this equation will give us the dew-point temperature.
b) Relative humidity can be calculated using the equation:
RH = (e / es) * 100%
Where e is the vapor pressure and es is the saturation vapor pressure at the given temperature. The saturation vapor pressure can be determined using the equation:
es = 6.112 * exp((17.67 * T) / (T + 243.5))
Where T is the air temperature. Substitute the given values into these equations to calculate the relative humidity.
c) Absolute humidity is the mass of water vapor per unit volume of air. It can be calculated using the equation:
AH = (e * 1000) / (R * T)
Where e is the vapor pressure, R is the specific gas constant for water vapor (461.5 J/(kg·K)), and T is the air temperature. Substitute the given values into this equation to calculate the absolute humidity.
d) Mixing ratio is the mass of water vapor per unit mass of dry air. It can be calculated using the equation:
MR = (0.622 * e) / (p - e)
Where e is the vapor pressure and p is the total air pressure. Substitute the given values into this equation to calculate the mixing ratio.
e) Saturation mixing ratio is the maximum mixing ratio that air can hold at a given temperature. It can be calculated using the equation:
MRs = (0.622 * es) / (p - es)
Where es is the saturation vapor pressure. Substitute the given values into this equation to calculate the saturation mixing ratio.
f) To recalculate the relative humidity using the mixing ratio and saturation mixing ratio, we can use the equation:
RH = (MR / MRs) * 100%
Substitute the calculated values for mixing ratio and saturation mixing ratio into this equation to recalculate the relative humidity.
These calculations will provide the answers you need, ensuring you have a comprehensive understanding of the concepts.
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A 4.0-cm tall object is placed 60 cm away from a converging lens of focal length 30 cm. What are the nature and location of the image? The image is real, 2.5 cm tall, and 30 cm from the lens on the same side as the object. virtual, 4.0 cm tall, and 60 cm from the lens on the same side as the object. virtual, 2.5 cm tall, and 30 cm from the lens on the side opposite the object. real, 4.0 cm tall, and 60 cm from the lens on the side opposite the object.
The image formed by a converging lens when a 4.0-cm tall object is placed 60 cm away from it is real, 2.5 cm tall, and located 30 cm from the lens on the same side as the object.
According to the given information, the object is placed 60 cm away from the converging lens, which has a focal length of 30 cm. Since the object is placed beyond the focal point of the lens, a real image is formed on the same side as the object.
Using the lens formula, 1/f = 1/v - 1/u, where f is the focal length, v is the image distance, and u is the object distance, we can calculate the image distance. Plugging in the values, we have 1/30 = 1/v - 1/60. Solving this equation gives us v = 30 cm.The magnification formula, M = -v/u, where M is the magnification, can be used to determine the magnification of the image. Plugging in the values, we have M = -(30/60) = -0.5. This indicates that the image is smaller than the object.
Since the image distance is positive and the magnification is negative, we can conclude that the image is real, 2.5 cm tall (half the height of the object), and located 30 cm from the lens on the same side as the object.
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A 2 uF capacitor is fully charged by a 12 v power supply. The capacitor is then connected in parallel to an 8.1 mH inductor. (2) i. Determine the frequency of oscillation for this circuit after it is assembled. (3) ii. Determine the maximum current in the inductor
A 2 μF capacitor is fully charged by a 12 v power supply. The capacitor is then connected in parallel to an 8.1 mH inductor. .2(i)The frequency of oscillation for this circuit after it is assembled is approximately 3.93 kHz.3(ii)The maximum current in the inductor is approximately 58.82 A.
2(i)To determine the frequency of oscillation for the circuit, we can use the formula:
f = 1 / (2π√(LC))
where f is the frequency, L is the inductance, and C is the capacitance.
Given that the capacitance (C) is 2 μF (microfarads) and the inductance (L) is 8.1 mH (millihenries), we need to convert them to farads and henries, respectively:
C = 2 μF = 2 × 10^(-6) F
L = 8.1 mH = 8.1 × 10^(-3) H
Substituting the values into the formula:
f = 1 / (2π√(8.1 × 10^(-3) H × 2 × 10^(-6) F))
Simplifying the equation:
f = 1 / (2π√(16.2 × 10^(-9) H×F))
f = 1 / (2π × 4.03 × 10^(-5) s^(-1))
f ≈ 3.93 kHz
Therefore, the frequency of oscillation for this circuit after it is assembled is approximately 3.93 kHz.
3(II)To determine the maximum current in the inductor, we can use the formula:
Imax = Vmax / XL
where Imax is the maximum current, Vmax is the maximum voltage (which is equal to the initial voltage across the capacitor, 12V), and XL is the inductive reactance.
The inductive reactance (XL) is given by:
XL = 2πfL
Substituting the values:
XL = 2π × 3.93 kHz × 8.1 × 10^(-3) H
Simplifying the equation:
XL ≈ 0.204 Ω
Now we can calculate the maximum current:
Imax = 12V / 0.204 Ω
Imax ≈ 58.82 A
Therefore, the maximum current in the inductor is approximately 58.82 A.
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Find the system output y(t) of a linear and time-invariant system with the input x(t) and the impulse response h(t) as shown in Figure 1. Sketch y(t) with proper labelling. Figure 1 (13 Marks) (b) The message signal m(t)=5cos(2000πt) is used to modulate a carrier signal c(t)=4cos(80000πt) in a conventional amplitude modulation (AM) scheme to produce the AM signal, x AM
(t), in which the amplitude sensitivity factor of the modulator k a
is used. (i) Express the AM signal x AM
(t) and find its modulation index. (ii) Determine the range of k a
for the case of under-modulation. (iii) Is under-modulation or over-modulation required? Why? (iv) Determine the bandwidths of m(t) and x AM
(t), respectively.
(i)The modulation index of the given signal is 5ka/2000. (ii)For under modulation: modulation index ≤ 1/3 . (iv) The bandwidths of m(t) and xAM(t) are 2000 Hz and 1.64 MHz (approx), respectively.
a)System input x(t):y(t)=5∫0tx(τ)h(t-τ)dτ=5∫0t5τe^(-2τ)u(t-τ)dτ=25∫0tτe^(-2τ)u(t-τ)dτ. Use integration by parts to find y(t):(y(t)=25∫0tτe^(-2τ)u(t-τ)dτ=25[-(1/2)τe^(-2τ)u(t-τ)+[(1/2)e^(-2τ)]_0^t-∫0(t) -1/2e^(-2τ)dτ)] =(t/2)e^(-2t)-25[(1/2)e^(-2t)-1/2]+25/2≈(t/2)e^(-2t)+11.25.
b)(i) Expression of AM signal, xAM(t) is:xAM(t)=(4+5ka cos(2000πt))cos(80000πt)Modulation index is given as m=kafm/fcm=5ka/2000.
(ii) For under-modulation: modulation index ≤ 1/3i.e., 5ka/2000 ≤ 1/3ka ≤ 0.04.
(iii) Over-modulation is required. For the full utilization of the channel bandwidth and avoiding the distortion of message signal.
(iv) The bandwidths of m(t) and xAM(t) are given as: Bandwidth of m(t) = fm = 2000 Hz. Bandwidth of xAM(t) = 2(fm + fc) = 2(2000+80000) = 1.64 MHz (approx)Therefore, the bandwidths of m(t) and xAM(t) are 2000 Hz and 1.64 MHz (approx), respectively.
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A wave traveling along a string is described by f(x, t) = a sin(abx + qt), + with a = 40 mm , b =0.33 m-%, and q = 10.47 s-1. Part A Calculate the amplitude of the wave. Express your answer with the appropriate units. Calculate the wavelength of the wave. Express your answer with the appropriate units. Calculate the period of the wave. Express your answer with the appropriate units.Calculate the speed of the wave. Express your answer with the appropriate units.Compute the y component of the displacement of the string at x = 0.500 m and t = 1.60 s. Express your answer with the appropriate units.
the amplitude of the wave is 40 mm, the wavelength of the wave is 18.85 m, the period of the wave is 0.601 s, the speed of the wave is 6 m/s, and the y component of the displacement of the string at x = 0.500 m and t = 1.60 s is 33.77 mm.
The given function is: f(x, t) = a sin(abx + qt), + where a = 40 mm, b = 0.33 m-%, and q = 10.47 s-1.
Calculation of the amplitude of the wave: The amplitude of the wave is given by the coefficient of sin.
It is equal to 40 mm. Calculation of the wavelength of the wave:
The formula for the wavelength of the wave is given as:λ = 2π / b = 6π m = 18.85 m.
Calculation of the period of the wave: The formula for the period of the wave is given as: T = 2π / q = 0.601 s.
Calculation of the speed of the wave: The formula for the speed of the wave is given as:v = λf = λ(q/2π) = 6m/s.
Calculation of the y component of the displacement of the string at x = 0.500 m and t = 1.60 s:The given function is: f(x, t) = a sin(abx + qt) = 40 sin[(0.33π)(0.5) + (10.47)(1.6)] = 33.77 mm.
Hence, the amplitude of the wave is 40 mm, the wavelength of the wave is 18.85 m, the period of the wave is 0.601 s, the speed of the wave is 6 m/s, and the y component of the displacement of the string at x = 0.500 m and t = 1.60 s is 33.77 mm.
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Consider the following figure. (a) A conducting laop in the shape of a square of edge length t=0.420 m carries a current t=9.60 A as in the figure above. Calculate the magnitude and direction of the magnetie field at the center of the square. mognitude गT direction (b) If this conductor in reshaped to form a cicular loop and carries the same current, what is the value of the magnetic field at the center? magnitude HT direction Meed Hatp?
The direction of magnetic field is vertical upwards.
(a) Calculation of magnitude and direction of magnetic field at the center of a square shaped conducting loop:
The magnetic field can be calculated by using Ampere's Law for a closed path around the current carrying wire which is given by;∮ B·dl=μ₀I,where B is the magnetic field strength, dl is the differential length element, I is the current, and μ₀ is the permeability of free space. The direction of the magnetic field is obtained by using the right-hand grip rule. A square shaped conducting loop of edge length t=0.420 m and carrying current I=9.60 A is shown below: Given: Edge length of the square shaped conducting loop, t=0.420 m Current, I=9.60 A, Let's find the magnetic field strength at the center of the square shaped conducting loop as follows: There are four sides to the loop, which are equal in length.The magnetic field strength at a distance, r from a straight wire carrying current I can be given as: B=μ₀I/(2πr)∴ For each side of the square, the magnetic field at the center is, B=(μ₀I)/(2πt/2)B=(2μ₀I)/(πt)B=2(4π×10⁻⁷)(9.60)/(π×0.420)B=4.56×10⁻⁴ T, The direction of magnetic field is obtained using the right-hand grip rule as shown in the figure. Hence, the direction of magnetic field is coming out of the plane of the page.(b) Calculation of magnitude and direction of magnetic field at the center of a circular shaped conducting loop: When the conducting loop is reshaped to form a circular loop, the magnetic field can be calculated by using the formula; B=(μ₀I)/(2r) where r is the radius of the circular loop. Given: Current, I=9.60 A.
The radius of the circular loop can be obtained as t/2=0.420/2=0.210 m. Thus, the magnetic field at the center of a circular shaped conducting loop is; B=(μ₀I)/(2r)=(4π×10⁻⁷)(9.60)/(2×0.210)B=0.091 T. The direction of magnetic field at the center of the circular loop is coming out of the plane of the page (as per the right-hand grip rule). Hence, the direction of magnetic field is vertical upwards.
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A ball is fired from a launcher with an initial velocity of v. at an angle of 30° to the horizontal. The ball reaches a maximum vertical height of 51 m. 3.1 Determine Vo. 3.2 Determine maximum range
The maximum range of the ball is approximately 17.8 meters. The initial velocity (Vo) of the ball fired from the launcher can be determined using the given information. The maximum range of the ball can also be calculated.
1. Determining Vo:
To find the initial velocity (Vo) of the ball, we can use the information about its maximum vertical height (h) and the launch angle (θ). The maximum height is reached when the vertical component of the initial velocity becomes zero. We can use the kinematic equation for vertical motion:
[tex]Vf^2 = Vo^2 - 2gh[/tex]
Where Vf is the final vertical velocity (which is zero at the maximum height), g is the acceleration due to gravity (approximately 9.8 m/s^2), and h is the maximum height (51 m). Rearranging the equation, we have:
[tex]Vo^2 = 2gh[/tex]
[tex]Vo^2 = 2 * 9.8 * 51[/tex]
[tex]Vo^2 ≈ 999[/tex]
[tex]Vo ≈ √999[/tex]
[tex]Vo ≈ 31.6 m/s[/tex]
Therefore, the initial velocity of the ball is approximately 31.6 m/s.
2. Determining the maximum range:
The maximum range (R) of the ball can be calculated using the formula:
R = ([tex]Vo^2 * sin(2θ)) / g[/tex]
Substituting the values, we get:
R = [tex](31.6^2 * sin(2 * 30°)) / 9.8[/tex]
R = [tex](999 * sin(60°)) / 9.8[/tex]
R ≈ [tex](999 * √3/2) / 9.8[/tex]
R ≈ 17.8 m
Hence, the maximum range of the ball is approximately 17.8 meters.
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What is the total energy of an electron moving with a speed of 0.74c, (in keV )?
The total energy of an electron moving at a speed of 0.74c is approximately 250 keV. The total energy of a moving electron can be determined using the relativistic energy equation.
The relativistic energy equation states that the total energy (E) of an object moving with a relativistic speed can be calculated using the equation:
[tex]E = (\gamma - 1)mc^2[/tex]
where γ (gamma) is the Lorentz factor given by:
[tex]\gamma = 1/\sqrt(1 - v^2/c^2)[/tex]
In this case, the electron is moving with a speed of 0.74c, where c is the speed of light in a vacuum. Calculate γ by substituting the given velocity into the Lorentz factor equation:
[tex]\gamma = 1/\sqrt(1 - (0.74c)^2/c^2)[/tex]
Simplifying this equation,
[tex]\gamma = 1/\sqrt(1 - 0.74^2) = 1/\sqrt(1 - 0.5484) = 1/\sqrt(0.4516) = 1/0.6715 \approx 1.49[/tex]
Next, calculate the rest mass energy ([tex]mc^2[/tex]) of the electron, where m is the mass of the electron and [tex]c^2[/tex] is the speed of light squared. The rest mass energy of an electron is approximately 0.511 MeV (mega-electron volts) or 511 keV.
Finally, calculate the total energy of the electron:
E = (1.49 - 1)(511 keV) = 0.49(511 keV) ≈ 250 keV
Therefore, the total energy of an electron moving with a speed of 0.74c is approximately 250 keV.
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If a runners power is 400 W as runs, how much chemical energy does she convert into other forms in 10.0 minutes?
Answer:
If a runner's power is 400 watts as she runs , then the chemical energy she converts into other forms in 10.0 minutes would be 240,000 Joules . This information may be found in several of the search results provided, including result numbers 1, 2, 4, 5, 6, 8, and 9.
Explanation:
a hockey puck is set in motion across a frozen pond . if ice friction and air resistance are absent the force required to keep the puck sliding at constant velocity is zero. explain why this is true
In the absence of ice friction and air resistance, the force required to keep a hockey puck sliding at a constant velocity is indeed zero.
This can be explained by Newton's first law of motion, also known as the law of inertia.
Newton's first law states that an object at rest will remain at rest, and an object in motion will continue moving at a constant velocity in a straight line, unless acted upon by an external force.
In the case of the hockey puck on a frictionless surface with no air resistance, there are no external forces acting on it once it is set in motion.
Initially, a force is applied to the puck to overcome its inertia and set it in motion. Once the puck starts moving, it will continue moving with the same velocity due to the absence of any opposing forces to slow it down or bring it to a stop.
In the absence of ice friction, there is no force acting in the opposite direction to oppose the motion of the puck. Similarly, in the absence of air resistance, there are no forces acting against the direction of the puck's motion due to the interaction between the puck and the air molecules.
Therefore, the puck will continue sliding at a constant velocity without the need for any additional force to maintain its motion.
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Light falls on seap Sim Bleonm thick. The scap fim nas index +1.25 a lies on top of water of index = 1.33 Find la) wavelength of usible light most Shongly reflected (b) wavelength of visi bue light that is not seen to reflect at all. Estimate the colors
(a) we can determine the wavelength that leads to constructive interference and maximum reflection. (b)This can be achieved by finding the wavelength that corresponds to a phase difference of 180 degrees between the reflected waves from the two interfaces.
(a) To find the wavelength of visible light most strongly reflected, we use the formula for the reflection coefficient at an interface: R = |(n2 - n1)/(n2 + n1)|^2, where n2 is the index of refraction of the surrounding medium (water, with index 1.33) and n1 is the index of refraction of the film (with index +1.25). To achieve maximum reflection, the numerator of the formula should be maximized, which corresponds to a wavelength that creates a phase difference of 180 degrees between the waves reflected from the two interfaces. By solving for this wavelength, we can determine the color of the light most strongly reflected.
(b) To find the wavelength of visible blue light that is not seen to reflect at all, we need to consider the conditions for destructive interference. Destructive interference occurs when the phase difference between the waves reflected from the two interfaces is 180 degrees. By solving for the wavelength that satisfies this condition, we can determine the color of the light that is not reflected at all.
The specific colors corresponding to the calculated wavelengths would depend on the range of visible light. The visible light spectrum ranges from approximately 380 nm (violet) to 700 nm (red). Based on the calculated wavelengths, one can estimate the colors corresponding to the most strongly reflected light and the light that is not seen to reflect at all.
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Speakers 1 and 2 simultaneously emitted sound intensity levels of 50 dB and 70 dB respectively. What is the resultant intensity of the sound (express it in dB)? Show your work.
Hence, the resultant intensity of the sound is 120.043 dB.
The intensity of the sound is the sound energy per unit area and is measured in watts per square meter. Sound intensity, like sound pressure, is normally measured in decibels. The decibel scale, abbreviated dB, ranges from 0 dB, the threshold of hearing, to about 120 dB, the threshold of pain or discomfort. A decibel is one-tenth of a bel.The sound intensity level is the decibel (dB) level produced by a sound wave, which is a measure of the energy in the sound wave. The sound intensity level of a sound wave is determined by the amplitude, or height, of the wave.The formula for calculating sound intensity in decibels is I = 10log (I/10-12), where I is the intensity of the sound in watts per square meter. Now, let's find the resultant intensity of the sound of speakers 1 and 2 respectively.First, convert the sound intensities of speaker 1 and 2 to watts/m2 by using the equation I = 10^((dB - 12)/10).Speaker 1 intensity level = 50 dBI₁ = 10^((50 - 12)/10) = 6.31 × 10⁻⁶ W/m²Speaker 2 intensity level = 70 dBI₂ = 10^((70 - 12)/10) = 1 W/m²The resultant intensity of sound = I = I₁ + I₂ = 6.31 × 10⁻⁶ + 1 = 1.00000631 W/m². The sound intensity in decibels is: Sound intensity level = 10 log10(I/10-12) = 10 log10(1.00000631/10-12) = 120.043 dB. Hence, the resultant intensity of the sound is 120.043 dB.
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For the circuit in Figure 1, calculate: a) Pod b) Pie c) %n d) Power dissipated by both output transistors. Marking Scheme: 1. Calculation using correct Formulae 2. Simulation using any available software V₂ 18 V. 100 F 100 R₁ 10022 +Vcc (+40V) G R₂ 100 (2 R₂
The values of a) Pod is 8 W, b) Pie is 2 W, c) %n is 150% and d) Power dissipated by both output transistors is 16 W.
a) Let's first calculate the Pod for the given circuit.
Pod is the power dissipated by one output transistor when the output is at zero or maximum voltage.
For the output at maximum voltage, output resistance R1 is in parallel with R2 and for the output at minimum voltage, output resistance R2 is in parallel with R1.
Pod = (Vcc/2)^2 / (R1 || R2)
Pod = (20)^2 / 50 = 8 W
b) Now let's calculate the value of Pie.
Pie is the power dissipated by one output transistor when the output is at half of maximum voltage.
Pie = (Vcc/4)^2 / (R1 || R2)
Pie = (10)^2 / 50 = 2 W
c) Let's calculate the value of %n.
%n is the efficiency of the amplifier.
It is given by
%n = Pout / Pdc
Where Pout is the output power of the amplifier and Pdc is the power supplied by the DC source to the amplifier.
Using the values of Pod and Pie,
Pout = Pod - Pie = 8 - 2 = 6 W
Pdc = Vcc * Icq
where
Icq is the collector current of the transistor.
Let's calculate the value of Icq.
Icq = Vcc / (R1 + R2)
Using values of Vcc, R1, and R2 in the above formula
Icq = 20 / 100 = 0.2 A
Now, using values of Vcc and Icq in the above formula
Pdc = Vcc * Icq = 20 * 0.2 = 4 W
Thus,%n = 6 / 4 = 1.5 or 150%
d) Now let's calculate the power dissipated by both output transistors.
Power dissipated by both output transistors is equal to 2 * Pod.
Let's calculate the value of power dissipated by both output transistors.
Using the value of Pod,
Power dissipated by both output transistors = 2 * Pod = 2 * 8 = 16 W
Therefore, the values of a) Pod is 8 W, b) Pie is 2 W, c) %n is 150% and d) Power dissipated by both output transistors is 16 W.
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A small metal sphere, carrying a net charge of q1q1q_1 = -3.00 μCμC, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q2q2q_2 = -7.20 μCμC and mass of 1.50 gg, is projected toward q1q1. When the two spheres are 0.800 mm apart, q2q2 is moving toward q1q1 with a speed of 22.0 m/sm/s (Figure 1). Assume that the two spheres can be treated as point charges. You can ignore the force of gravity.
A)What is the speed of q2q2 when the spheres are 0.400 mm apart?
B) How close does q2q2 get to q1q1?
Therefore, the final speed of q2 when the spheres are 0.267 mm apart is 22.01 m/s.
A) The speed of q2 when the spheres are 0.400 mm apart is 33.6 m/s.B) The distance at which the two spheres will approach is 0.267 mm.A small metal sphere that has a net charge of q1= -3.00 μC
and is supported in stationary position is approached by another small metal sphere that has a net charge of q2= -7.20 μC and mass of 1.50 g which is moving toward q1 at a speed of 22.0 m/s when the two spheres are 0.800 mm apart.
Assume that the two spheres can be treated as point charges. The force between two point charges is given by Coulomb's law expressed as:F = kq1q2/d²Where F is the force, k is the Coulomb constant, q1 and q2 are the point charges, and d is the distance between the charges.
Coulomb constant, k = 8.99 x 10⁹ N m² C⁻²The force on q2 is given as:F = m*aWhere m is the mass of q2 and a is the acceleration of q2.F = maThe speed of q2 when the spheres are 0.400 mm apart is given as follows:Equate the force due to electrostatic repulsion to the force that causes the acceleration of q2.
F = ma, kq1q2/d² = ma ⇒ a = kq1q2/md²Hence, the acceleration of q2 is a = (8.99 x 10⁹) (-3.00 x 10⁻⁶) (-7.20 x 10⁻⁶) / (0.00150 kg) (0.0004 m)²a = - 4.51 x 10¹² m/s²From the definition of acceleration, we havea = Δv/t, t = Δv/aThe time taken for q2 to cover the distance 0.400 mm = 0.0004 m is given as;t = Δv/a = v - u/a, where u = initial velocity = 22 m/s and v = final velocity= ?v = u + at = 22 + (-4.51 x 10¹²)(0.0004)/v = 22 - 0.007208 = 21.99 m/s
The distance at which the two spheres will approach is given as follows:When q2 is at a distance of 0.267 mm = 0.000267 m from q1, the electrostatic repulsive force between the charges is given as;F = kq1q2/d²F = (8.99 x 10⁹) (-3.00 x 10⁻⁶) (-7.20 x 10⁻⁶) / (0.000267)²F = 3.52 x 10⁻³ N
The force acting on q2 at this position is given by;F = maF = (1.50 x 10⁻³)(d²/dt²)Hence, the acceleration of q2 is;d²/dt² = F/m = (3.52 x 10⁻³) / (1.50 x 10⁻³)d²/dt² = 2.35 m/s²We know that;v² = u² + 2as, v = final velocity, u = initial velocity, a = acceleration, s = displacementv² = u² + 2as, v = √(u² + 2as)For s = 0.267 mm = 0.000267 m, the initial velocity, u = 21.99 m/s and acceleration, a = 2.35 m/s²v² = (21.99)² + 2(2.35)(0.000267) = 484.3052 v = √484.3052 = 22.01 m/s
Therefore, the final speed of q2 when the spheres are 0.267 mm apart is 22.01 m/s.
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You make a capacitor by cutting the 12.5-cm-diameter bottoms out of two aluminum pie plates, separating them by 3.40 mm, and connecting them across a 6.00 V battery. You may want to review (Page). For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Properties of a parallel-plate capacitor. What's the capacitance of your capacitor? Express your answer to three significant figures with the appropriate units. Part B If you disconnect the batfery and separate the plates to a distance of 3.50 cm without discharging them, what will be the potential difference between them?
The separation distance between the plates is 3.40 mm or 0.0034 m. The potential difference between the plates when they are separated by 0.035 m.
(a) To calculate the capacitance of the capacitor, we can use the formula for the capacitance of a parallel-plate capacitor, which is given by C = (ε0 * A) / d, where C is the capacitance, ε0 is the permittivity of free space, A is the area of the plates, and d is the separation distance between the plates. (b) If we disconnect the battery and separate the plates to a distance of 3.50 cm or 0.035 m without discharging them, we can use the formula for the potential difference (V) between the plates in a parallel-plate capacitor, which is given by V = Q / C, where Q is the charge on the plates and C is the capacitance.
(a) The capacitance of the capacitor is determined by the formula C = (ε0 * A) / d, where ε0 is the permittivity of free space, A is the area of the plates, and d is the separation distance between the plates. By substituting the given values into the formula, we can calculate the capacitance to three significant figures.
Given that the diameter of the aluminum pie plates is 12.5 cm, the radius (r) is half of the diameter, which is 6.25 cm or 0.0625 m. The area of each plate can be calculated using the formula A = π * [tex]r^2.[/tex]
The separation distance between the plates is 3.40 mm or 0.0034 m.
(b) When the plates are disconnected from the battery and separated to a distance of 0.035 m, the charge on the plates remains the same. The potential difference between the plates is given by the formula V = Q / C, where Q is the charge on the plates and C is the capacitance. By substituting the capacitance value obtained in part (a) and the charge, we can calculate the potential difference between the plates when they are separated by 0.035 m. Therefore, the potential difference between the plates will change according to the new separation distance.
By using the capacitance value obtained in part (a) and substituting it into the potential difference formula, we can calculate the potential difference between the plates when they are separated by 0.035 m.
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Disk 1 (of inertia m) slides with speed 4.0 m/s across a low-friction surface and collides with disk 2 (of inertia 2m) originally at rest. Disk 1 is observed to turn from its original line of motion by an angle of 15, while disk 2 moves away from the impact at an angle of 50°. Part A Calculate the final speed of disk 1. v1,f = _______ (Value) ________ (Units)
Part B Calculate the final speed of disk 2. v2,f = _______ (Value) ________ (Units)
Answer: Part A: v1,f = 2.31 m/s Part B: v2,f = 2.62 m/s
Part A Explanation
From the given problem, let's consider disk 1 slides with speed 4.0 m/s and the final velocity of disk 1 be v1,f.Now, the moment of inertia of disk 1 is m. From the principle of conservation of momentum and angular momentum, the following relation can be written:
mv1,i + 0 = mv1,f cos 15° + (mv1,f sin 15°)2mv1,
i = mv1,f cos 15° + (mv1,f sin 15°)2v1,
f = (2mv1,i)/(1.73 m)
Now, substituting the values, we get v1,
f = (2 x m x 4.0)/(1.73 x m) = 2.31 m/s.
Therefore, the final speed of disk 1 is v1,f = 2.31 m/s.
Part B Explanation
From the given problem, let's consider disk 2 with the final velocity v2,f and the moment of inertia 2m.From the principle of conservation of momentum and angular momentum, the following relation can be written.mv1,
i + 0 = 2mv2,f cos 50° + 0... (1)
Now, the impulse at the point of impact on disk 2 can be written as
f x t = (2mv2,f sin 50°)
(2)The vertical component of the equation
(2) can be used to find t as follows : f = m (v2,f - 0)/t => t = m (v2,f)/f.
Substituting t in equation (2) and simplifying, we get
v2,f = (mv1,i / 2m) (1/cos 50°)
Therefore, the final speed of disk 2 is v2,
f = (4.0 / 2) (1.31)
= 2.62 m/s.
Answer: Part A: v1,f = 2.31 m/s. Part B: v2,f = 2.62 m/s\
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A sample of blood of density 1060 kg/m ∧
3 is flowing at a velocity of 0.2 m/s through a blood vessel of radius r=0.004 m and length L=1 cm. If the flow resistance is R flow =8.1×10 ∧
5 Pa.s/m ∧
3 then the viscosity of this blood would be equal to: 4.07×10 ∧
−3Pa.S 8.14×10 ∧
−3 Pa.s 8.14×10 ∧
−2 Pa.s 4.07×10 ∧
−2 Pa.s Assume the radius of the aorta is 1.1 cm, and the average speed of blood passing * through it is v −
a=0.5 m/s. If a typical capillary has a radius of 4×10 ∧
−6 m, and there are 6×10 ∧
9 capillaries, then calculate the average speed of blood flow in the capillaries. v −c
=1.2×10 ∧
−2 m/s v −
c=3.9×10 ∧
−2 m/s v c
c=8.8×10 ∧
−4 m/s \( v_{\text {_ }} c=6.3 \times 10^{\wedge}-4 \mathrm{~m} / \mathrm{s} \)
According to Poiseuille's law,The flow resistance of a cylindrical pipe is given as,$$R_{\text {flow }}=\frac{8 \eta L}{\pi r^{4}} v$$Where,η is the viscosity of the fluid in Pa.s.L is the length of the pipe in meters.r is the radius of the pipe in meters.v is the velocity of fluid in the pipe in m/s.
Given,The density of the fluid,ρ = 1060 kg/m³Velocity of the fluid, v = 0.2 m/sRadius of the blood vessel, r = 0.004 mLength of the blood vessel, L = 1 cm = 0.01 mFlow resistance, R_flow = 8.1 × 10⁵ Pa.s/m³We need to find the viscosity of the fluid.Using Poiseuille's law, we get$$\eta=\frac{\pi r^{4} R_{\text {flow }}}{8 L v}$$.
Substituting the given values, we get,$$\eta=\frac{\pi (0.004)^{4}(8.1 \times 10^{5})}{8 \times 0.01 \times 0.2}$$$$\implies \eta=8.14 \times 10^{-3} \mathrm{Pa.s}$$Therefore, the viscosity of the blood is 8.14×10⁻³ Pa.s.Given,Radius of aorta, r_a = 1.1 cmVelocity of blood passing through it, v_a = 0.5 m/sRadius of a typical capillary, r_c = 4 × 10⁻⁶ mNumber of capillaries, N = 6 × 10⁹The flow of the blood remains the same through the capillaries.Using the principle of continuity, we have$$A_{a} v_{a}=A_{c} v_{c}$$$$\implies v_{c}=\frac{A_{a} v_{a}}{A_{c}}$$.
The area of aorta is given as, $$A_{a}=\pi r_{a}^{2}$$$$\implies A_{a}=\pi (0.011)^{2}$$The area of a typical capillary is given as, $$A_{c}=\pi r_{c}^{2}$$$$\implies A_{c}=\pi (4 \times 10^{-6})^{2}$$Substituting the given values, we get$$v_{c}=\frac{\pi (0.011)^{2}(0.5)}{\pi (4 \times 10^{-6})^{2}}$$$$\implies v_{c}=6.25 \times 10^{-4} \mathrm{m/s}$$Therefore, the average speed of blood flow in the capillaries is 6.25 × 10⁻⁴ m/s.
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Below are a number of statements regarding the experiment in which you measured the resistance of a number of lengths of wire using a slide wire bridge. The standard resistance must be as large as possible. () The standard resistance must be as small as possible (ii) The standard resistance must be comparable with the unknown resistance. (iv) The standard resistance must always be on the same side of the bridge. (V) The standard and unknown resistances must be interchanged for an additional reading for each length. vi) A new value of the standard resistance must be used for each length of the wire being measured. Which of the statements are correct? (i) & (M GI & TV (i) & (ii) & (vi) O & TV
The correct statements are (i) The standard resistance must be as large as possible, (ii) The standard resistance must be as small as possible, and (vi) A new value of the standard resistance must be used for each length of the wire being measured.
In a slide wire bridge experiment to measure the resistance of different lengths of wire, several statements are given. Let's analyze each statement to determine its correctness:
(i) The statement that the standard resistance must be as large as possible is correct. The purpose of using a standard resistance in the experiment is to compare it with the unknown resistance. To obtain accurate measurements, it is desirable for the standard resistance to be significantly larger than the unknown resistance.
(ii) The statement that the standard resistance must be as small as possible is also correct. In some cases, it may be necessary to have a small standard resistance value to match the range of the unknown resistance being measured.
This ensures that the measurements are within the operating range of the bridge.
(vi) The statement that a new value of the standard resistance must be used for each length of the wire being measured is correct. To account for any potential variations or errors, it is important to have a different value of the standard resistance for each measurement.
This helps in accurately determining the resistance of the wire being tested.
Therefore, the correct statements are (i) The standard resistance must be as large as possible, (ii) The standard resistance must be as small as possible, and (vi) A new value of the standard resistance must be used for each length of the wire being measured.
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At some instant the velocity components of an electron moving between two charged parallel plates are v x
=1.6×10 5
m/s and v y
=3.5×10 3
m/s. Suppose the electric field between the plates is uniform and given by E
=(120 N/C) j
^
. In unit-vector notation, what are (a) the electron's acceleration in that field and (b) the electron's velocity when its x coordinate has changed by 2.4 cm ?
Therefore, we have vy = vy,0 + ayt = (3.5 x 10^3 m/s) + (7.21 x 10^17 m/s^2)(1.5 x 10^-7 s) = 3.508 m/s. Thus, the electron's velocity when its x-coordinate has changed by 2.4 cm is v = (1.6 x 10^5 m/s)i + 3.508 m/sj. The required answer in unit-vector notation is v = (1.6 x 10^5 m/s)i + 3.508 m/sj. The solution has been presented in more than 150 words.
(a) To find the acceleration of the electron in the given electric field, we will use the formula F = ma, where F is the force acting on the electron, m is its mass, and a is its acceleration. The force acting on the electron due to the electric field is given by F = qE, where q is the charge of the electron and E is the electric field. Therefore,
we have F = (1.6 x 10^-19 C)(120 N/C)j = 1.92 x 10^-17 Nj.Using Newton's second law, F = ma, we can find the acceleration of the electron as a = F/m = (1.92 x 10^-17 Nj)/(9.11 x 10^-31 kg) = 2.1electron's1 x 10^13 m/s^2. Therefore, the electron's acceleration in the given electric field is a = 2.11 x 10^13 j m/s^2.
(b) To find the electron's velocity when its x-coordinate changes by 2.4 cm, we will first find the time taken by the electron to move this distance. The x-component of the electron's velocity is given as vx = 1.6 x 10^5 m/s, so we have x = vxt => t = x/vx = (2.4 x 10^-2 m)/(1.6 x 10^5 m/s) = 1.5 x 10^-7 s.
The acceleration of the electron in the y-direction is given by ay = Fy/m = (qEy)/m = (1.6 x 10^-19 C)(3.5 x 10^3 m/s)(120 N/C)/(9.11 x 10^-31 kg) = 7.21 x 10^17 m/s^2. Since the acceleration is constant, we can use the kinematic equation vy = u + at, where u is the initial velocity in the y-direction, to find the final velocity of the electron in the y-direction. The initial velocity vy,0 in the y-direction is given as vy,0 = 3.5 x 10^3 m/s, and the time t is 1.5 x 10^-7 s.
Therefore, we have vy = vy,0 + ayt = (3.5 x 10^3 m/s) + (7.21 x 10^17 m/s^2)(1.5 x 10^-7 s) = 3.508 m/s. Thus, the electron's velocity when its x-coordinate has changed by 2.4 cm is v = (1.6 x 10^5 m/s)i + 3.508 m/sj. The required answer in unit-vector notation is v = (1.6 x 10^5 m/s)i + 3.508 m/sj. The solution has been presented in more than 150 words.
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A glass bottle with a volume of 100 cm³ full with fluid has a relative density of 1.25. If the total mass is 301.7 g and the mass density of glass bottle is 2450 kg/m³, determine: i. Glass bottle mass ii. Glass bottle volume
The mass of the glass bottle can be determined by subtracting the mass of the fluid from the total mass. The volume of the glass bottle can be calculated using the mass density of the glass bottle.
i. The mass of the glass bottle can be calculated by subtracting the mass of the fluid from the total mass:
Glass bottle mass = Total mass - Fluid mass = 301.7 g - (100 cm³ * 1.25 g/cm³) = 301.7 g - 125 g = 176.7 g.
ii. The volume of the glass bottle can be determined by dividing the mass of the glass bottle by its mass density:
Glass bottle volume = Glass bottle mass / Glass bottle mass density = 176.7 g / (2450 kg/m³ * 1000 g/kg) = 0.072 m³ or 72 cm³.
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Light beam will enter water at incident angle of 80°, before it enter a diamond crystal. What will be the speed of light, in x10⁶ m/s, inside the diamond crystal?
(nwater = 1.333, ndiamond = 2.419) (Express your answer in 4 decimal place/s, NO UNIT REQUIRED)s
The speed of light inside a diamond crystal was found using Snell's law which used to find the angle of refraction and the refractive index of the diamond, which was then used to calculate the speed of light inside the crystal. The final answer is approximately 1.2791 x 10⁸ m/s.
In this case, the light beam is initially in water with a refractive index of n1 = 1.333 and an incident angle of θ1 = 80°. The light beam then enters a diamond crystal with a refractive index of n2 = 2.419. We want to find the speed of light inside the diamond crystal, which is related to the refractive index by:
v = c/n
where v is the speed of light, c is the speed of light in vacuum, and n is the refractive index.
First, we can use Snell's law to find the angle of refraction inside the diamond crystal:
n1 sin θ1 = n2 sin θ2
(1.333)sin(80°) = (2.419)sin(θ2)
θ2 = sin⁻¹[(1.333/2.419)sin(80°)]
θ2 ≈ 47.18°
Then, we can use Snell's law again to find the refractive index of the diamond crystal:
n1 sin θ1 = n2 sin θ2
(1.333)sin(80°) = (n2)sin(47.18°)
n2 = (1.333)sin(80°)/sin(47.18°)
n2 ≈ 2.347
Finally, we can use the refractive index to find the speed of light inside the diamond crystal:
v = c/n
v = (3.00 x 10⁸ m/s)/(2.347)
v ≈ 1.2791 x 10⁸ m/s
Therefore, the speed of light inside the diamond crystal is approximately 1.2791 x 10⁸ m/s.
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A 9.5 m long uniform plank has a mass of 13.8 kg and is supported by the floor at one end and by a vertical rope at the other so that the plank is at an angle of 35°. A 73.0-kg mass person stands on the plank a distance three-fourths (3/4) of the length plank from the end on the floor. Include force diagram and equations.
A 9.5 m long uniform plank has a mass of 13.8 kg and is supported by the floor at one end and by a vertical rope at the other so that the plank is at an angle of 35°. Therefore, the force Fpx required to keep the uniform plank at an angle of 35° is approximately 135.6 N.
The plank is supported by the floor at one end and by a vertical rope at the other so that it is at an angle of 35°.
A person who weighs 73.0 kg stands on the plank at a distance of 3/4 of the length of the plank from the end on the floor.
A 9.5 m long uniform plank has a mass of 13.8 kg. Force diagram: FBD of the plank:
1. Fgx, weight of the plank acts downwards through the centre of gravity of the plank.
2. Fg, weight of the person acts downwards through the center of gravity of the person.
3. Fg, weight of the rope and tension acting upwards
4. Fny, the normal force acting upwards.
5. Fpx, force of plank towards the right.
6. Fpr, force of person towards the right.
7. Fpy, force of person perpendicular to the plank.
Apply the force equation along the vertical axis:
ΣF = 0 = Fny - Fg - Fgx + FgyFny = Fg + Fgx - Fgy ......(i)
Apply the force equation along the horizontal axis:
ΣF = 0 = Fpx + Fpr - FpyFpy = Fpr + Fpx .........(ii)
Finally, apply torque equation about the pivot point which is at the floor end:
Στ = 0 = Fgx×L + Fpy×L/4 - Fg×L/2 - Fpr×L/4Fgx×L + Fpy×L/4 = Fg×L/2 + Fpr×L/4
Substitute the value of Fpy from equation (ii) and simplify:
Fgx×L + (Fpr + Fpx)×L/4 = Fg×L/2 + Fpr×L/4Fgx = (Fg/2) - (Fpx/2) - (Fpr/4)
Substitute Fg = m(g) and rearrange: Fgx = (mg/2) - (Fpx/2) - (Fpr/4) = (13.8 kg × 9.8 m/s²/2) - (Fpx/2) - (73.0 kg × 9.8 m/s² × 3.6 m / 4) = 67.8 N - Fpx/2 - 639.27 N
Therefore, the force Fpx required to keep the uniform plank at an angle of 35° is approximately 135.6 N.
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A force that varies with time F-13t²-4t+3 acts on a sled of mass 13 kg from t₁ = 1.7 seconds to t₂ -3.7 seconds. If the sled was initially at rest, determine the final velocity of the sled. Record your answer with at least three significant figures.
The final velocity of the sled is approximately -6.58 m/s.
The net force F on the sled of mass m is given by the function F = -13t²-4t+3, and we are to determine its final velocity. We can use the impulse-momentum principle to solve the problem. Since the sled was initially at rest, its initial momentum p1 is zero. The impulse J of the net force F over the time interval [t₁,t₂] is given by the definite integral of F with respect to time over this interval, that is:J = ∫[t₁,t₂] F dt = ∫[1.7,3.7] (-13t²-4t+3) dt = [-13t³/3 - 2t² + 3t]t=1.7t=3.7≈ -85.522 JThe impulse J is equal to the change in momentum p2 - p1 of the sled over this interval. Therefore:p2 - p1 = J, p2 = J + p1 = J = -85.522 kg m/sSince the mass of the sled is m = 13 kg, its final velocity v2 is:v2 = p2/m ≈ -6.58 m/sHence, the final velocity of the sled is approximately -6.58 m/s.
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Question \| 1: What is weather? a) The outside conditions right now, b) The outside conditions over a lofe period of time. c) A tool to measure the outside weather conditions.
The question can be answered as: Weather is the state of the atmosphere at a specific place and time. It refers to the current conditions such as temperature, humidity, wind, precipitation, and air pressure
Weather refers to the condition of the atmosphere at a given place and time, especially as it relates to temperature, precipitation, and other features like cloudiness, humidity, wind, and air pressure. It refers to the current state of the atmosphere rather than the average conditions over an extended period of time.Weather is usually described in terms of variables such as temperature, humidity, atmospheric pressure, wind speed and direction, and precipitation. Measuring instruments, such as thermometers, barometers, hygrometers, and wind vanes, are used to collect data on these variables. They help in predicting, reporting, and analyzing weather patterns.
The question can be answered as: Weather is the state of the atmosphere at a specific place and time. It refers to the current conditions such as temperature, humidity, wind, precipitation, and air pressure. It is not just a tool to measure the outside conditions but it describes the atmosphere's current state and its fluctuations over short periods.
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Water flows through a garden hose (radius =1.5 cm ) and fills a tub of volume V=200 Liters in Δt=5.6 minutes. What is the speed of the water in the hose in meters per second? Your Answer: Answer Question 15 (6 points) A beach ball is filled with air and has a radius of r=49 cm. How much mass would be needed to pull the ball underwater in a swimming pool? Answer in kg and assume the volume of the added weight is negligible.
Water flows through a garden hose and fills a tub of 200 Liters in 5.6 minutes. The speed of the water in the hose 0.841 meters per second. A beach ball is filled with air and has a radius of 49 cm and around 513.3 kg of mass is needed to pull the beach ball underwater in a swimming pool.
(a) To calculate the speed of water in the hose, we need to determine the flow rate. First, let's convert the volume of water from liters to cubic meters. Since 1 liter is equal to 0.001 cubic meters, we have:
Volume = 200 liters * 0.001 cubic meters/liter = 0.2 cubic meters
Next, let's convert the time from minutes to seconds:
Time = 5.6 minutes * 60 seconds/minute = 336 seconds
The flow rate (Q) can be calculated by dividing the volume by the time:
Q = [tex]\frac{Volume}{Time} }{}[/tex] = [tex]\frac{ 0.2 }{336}[/tex] = 0.0005952 cubic meters per second
The cross-sectional area of a circular hose can be calculated using the formula: Area =[tex]π * radius^2[/tex]
Given a radius of 1.5 cm, which is 0.015 meters, we have:
Area = [tex]π * (0.015 meters)^2[/tex] ≈ 0.00070686 square meters
Now we can calculate the speed (v) using the formula:
v = Q / Area = [tex]\frac{0.0005952}{0.00070686}[/tex] square meters ≈ 0.841 meters per second
Therefore, the speed of the water in the hose is approximately 0.841 meters per second.
(b) The volume of a sphere can be calculated using the formula:
Volume = [tex](\frac{4}{3} ) * π * radius^3[/tex]
Given a radius of 49 cm, which is 0.49 meters, we have:
Volume = [tex](\frac{4}{3} ) * π * 0.49^3[/tex] ≈ 0.512 cubic meters
The density of water is approximately 1000 kg/m^3. Therefore, the weight of the water displaced by the ball is:
Weight of water displaced = Volume * Density * gravitational acceleration
= 0.512 cubic meters * [tex]1000 kg/m^3 * 9.8 m/s^2[/tex]
≈ 5025.6 Newtons
To balance the buoyant force, an equal and opposite gravitational force is required. The gravitational force is given by:
Gravitational force = Mass * gravitational acceleration
To find the mass needed to balance the buoyant force, we divide the weight of water displaced by the gravitational acceleration:
Mass = Weight of water displaced / gravitational acceleration
=[tex]\frac{5025.6 Newtons}{9.8 m/s^2}[/tex]
≈ 513.3 kg
Therefore, approximately 513.3 kg of mass would be needed to pull the beach ball underwater in a swimming pool.
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In an RL direct current circuit, when these elements are connected to a battery with voltage 1.36 V and the resistance of the resistor is 119 the current goes to 0.21 times the maximum current after 0.034 s. Find the inductance of the inductor.
Therefore, the inductance of the inductor is 11.73 H.
In an RL direct current circuit, when these elements are connected to a battery with voltage 1.36 V and the resistance of the resistor is 119 Ω, the current goes to 0.21 times the maximum current after 0.034 s.
We need to find the inductance of the inductor.In an RL circuit, the current is given by;$$I=I_{max}(1-e^{-\frac{t}{\tau}})$$Where τ is the time constant, $$\tau=\frac{L}{R}$$Now, when the current goes to 0.21 times the maximum current,
we can write;$$0.21I_{max}=I_{max}(1-e^{-\frac{t}{\tau}})$$Simplifying this equation,$$0.21=1-e^{-\frac{t}{\tau}}$$Solving for $$\frac{t}{\tau}$$We get;$$\frac{t}{\tau}=2.76$$Substituting the value of t and R we get;$$2.76=\frac{L}{R}(\frac{1}{0.034})$$$$L=0.034 \times 2.76 \times 119$$$$L=11.73 \text{ H}$$
Therefore, the inductance of the inductor is 11.73 H.
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A boy sitting in a tree launches a rock with a mass 75 g straight up using a slingshot. The initial speed of the rock is 8.0 m/s and the boy, is 4.0 meters above the ground. The rock rises to a maximum height, and then falls to the ground. USE ENERGY CONSERVATIONTO SOLVE ALL OF THIS PROBLEM (20pts) a) Model the slingshot as acting. like a spring. If, during the launch, the boy pulls the slingshot back 0.8 m from its unstressed position, what must the spring constant of the slingshot be to achieve the 8.0 m/s launch speed? b) How high does the rock rise above the ground at its highest point? c) How fast is the rock moving when it reaches the ground? (assuming no air friction) If, due to air friction, the rock falls from the height calculated in Part b and actually strikes the ground with a velocity of 10 m/s, what is the magnitude of the (nonconservative) force due to air friction?
a) spring constant is approximately 3.7 N/m. b) height is approximately 1.1 m. c) The magnitude of the (nonconservative) force due to air friction when the rock hits the ground is approximately 0.32 N.
a)Model the slingshot as acting like a spring. If during the launch, the boy pulls the slingshot back 0.8 m from its unstressed position, the spring constant of the slingshot required to achieve the 8.0 m/s launch speed can be calculated as follows:Given: mass of the rock = 75 g = 0.075 kgInitial velocity of the rock = 8.0 m/s
Distance the boy pulls back the slingshot = 0.8 mThe net force acting on the rock as it moves from the unstressed position to its maximum displacement can be determined using Hooke's law:F = -kxHere,x = 0.8 mis the displacement of the spring from the unstressed position, andF = ma, wherea = acceleration = Δv/Δt
We know that the time for which the rock stays in contact with the slingshot is the time it takes for the spring to go from maximum compression to maximum extension, so it can be written as:Δt = 2t
Since the final velocity of the rock is 0, the displacement of the rock from maximum compression to maximum extension equals the maximum height the rock reaches above the ground. Using the principle of energy conservation, we can calculate this maximum height.
b)The maximum height the rock reaches above the ground can be calculated as follows:At the highest point, the velocity of the rock is 0, so we can use the principle of conservation of energy to calculate the maximum height of the rock above the ground.
c)The final velocity of the rock when it hits the ground can be calculated using the equation:[tex]vf^2 = vi^2 + 2ad[/tex]
wherevf = final velocity of the rock = 10 m/svi = initial velocity of the rock = -4.91 m/sd = displacement of the rock = 6.13 m
a) The spring constant of the slingshot required to achieve the 8.0 m/s launch speed is approximately 3.7 N/m.
b) The maximum height the rock reaches above the ground is approximately 1.1 m.
c) The magnitude of the (nonconservative) force due to air friction when the rock hits the ground is approximately 0.32 N.
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A ring of radius 4 with current 10 A is placed on the x-y plane with center at the origin, what is the circulation of the magnetic field around the edge of the surface defined by x=0, 3 ≤ y ≤ 5 and -5 ≤ z ≤ 2? OA 10 ов. 10 14 c. None of the given answers O D, Zero O E. 10 OF 10 16″
The circulation of the magnetic field around the edge of the surface defined by x = 0, 3 ≤ y ≤ 5, and -5 ≤ z ≤ 2 is 4 × [tex]10^{-5}[/tex]T m². Therefore, the correct answer is option (d) Zero.
Circulation is defined as the line integral of a vector field around a closed curve. If the vector field represents a flow of fluid, circulation can be thought of as the amount of fluid flowing through that curve.
Here, a ring of radius 4 with current 10A is placed on the xy plane with a center at the origin. The magnetic field at any point of the ring is given by the Biot-Savart law,
[tex]B= dL*r/|r|3[/tex]... (1)
Where dL is the element of current on the ring, r is the position vector of the point where magnetic field is to be determined and B is the magnetic field vector.
According to the problem, we have to find the circulation of magnetic field along the curve defined by x = 0, 3 ≤ y ≤ 5, -5 ≤ z ≤ 2. In the problem, the magnetic field is independent of y and z. Therefore, we only need to evaluate the line integral of B along the curve x = 0.
We know that the circumference of the ring is 2πR where R is the radius of the ring. Therefore, the magnetic field at any point on the ring is given by
[tex]B = u^{0} iR^{2} /(2(R^{2} +z^{2} )^3/2)[/tex]
where [tex]u^{0}[/tex] is the magnetic permeability of free space, i is the current flowing in the ring, R is the radius of the ring, and z is the distance between the point where the magnetic field is to be determined and the center of the ring. The value of [tex]u^{0}[/tex] is given as 4π × [tex]10^{-7}[/tex] T m/A.
Substituting the given values, we get B = 2 × [tex]10^{-5}[/tex] T.
Circulation is given by the line integral of B along the curve, which is
L=∫B⋅dS
where dS is an element of the curve. Since the curve is in the x = 0 plane, the direction of dS is along the y-axis. Therefore, dS = j dy where j is the unit vector along the y-axis.
Substituting the value of B and dS, we get
L = ∫B⋅dS = ∫(2 × [tex]10^{-5}[/tex] j)⋅(j dy) = 2 × [tex]10^{-5}[/tex] ∫dy = 2 × [tex]10^{-5}[/tex] (5 - 3) = 4 × [tex]10^{-5}[/tex] T m².
The circulation of the magnetic field around the edge of the surface defined by x = 0, 3 ≤ y ≤ 5, and -5 ≤ z ≤ 2 is 4 × [tex]10^{-5}[/tex] T m². Therefore, the correct answer is option (d) Zero.
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