(a) The wavelength of the incident light is 2.65 × 10⁻⁷ m
(b) The incident light cannot emit any electrons from the metal because its energy is less than the work function of the metal.
(c) The total number of photons emitted by the source is 2.50 × 10⁻²⁷ kg m/s.
(a) Calculation of the wavelength of incident light:
For the incident light on metallic silver from which 4.7 eV is required to remove an electron, the frequency of the incident light (f) can be calculated as:
f = (4.7 eV)/(h) = (4.7 × 1.6 × 10⁻¹⁹ J)/(6.63 × 10⁻³⁴ J s) ≈ 1.13 × 10¹⁵Hz
where h is Planck's constant and 1 eV = 1.6 × 10⁻¹⁹ J.
The wavelength of the incident light is given by,λ = (c)/f = (3 × 10⁸ m/s)/(1.13 × 10¹⁵ Hz) ≈ 2.65 × 10⁻⁷ m
(b) Calculation of the maximum kinetic energy of an emitted electron:
The energy of a photon can be determined as E = hf. Therefore, the energy of a photon of the incident light is, E = hf = (6.63 × 10⁻³⁴ J s)(1.13 × 10¹⁵ Hz) ≈ 7.48 × 10⁻¹⁹ J
To remove an electron from a metal whose work function is 7.5 eV, a photon should have a minimum energy of 7.5 eV.
Hence, the incident light cannot emit any electrons from the metal because its energy is less than the work function of the metal.
(c) Calculation of the number of photons and momentum of each photon: Given, the power of the light source is 2.0 mW.
Therefore, the energy of the light source is, E = Pt = (2.0 × 10⁻³ W)(30 s) = 6.0 × 10⁻² J
The energy of each photon is 7.48 × 10⁻¹⁹ J.
Hence, the total number of photons emitted by the source can be calculated as,
N = (E)/(hf) = (6.0 × 10⁻² J)/ (7.48 × 10⁻¹⁹ J) ≈ 8.02 × 10¹⁶
The momentum of a photon can be calculated as,
P = h/λ = (6.63 × 10⁻³⁴ J s)/(2.65 × 10⁻⁷ m) ≈ 2.50 × 10⁻²⁷ kg m/s
Therefore, the momentum of each photon is 2.50 × 10⁻²⁷ kg m/s.
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What is meant by the principle of moments
When it hangs straight down,the pendulum is about 1. 27 x 105 m off the ground. What is the height of the building if the pendulum swings with a frequency of ⅙ hertz
The height of the building is approximately 1.26994 x 10^5 meters.
To determine the height of the building, we can use the formula for the period of a simple pendulum:
T = 2π√(L/g),
where T is the period, L is the length of the pendulum, and g is the acceleration due to gravity.
In this case, the period T is the reciprocal of the frequency f:
T = 1/f.
Given that the frequency f is 1/6 Hz, we can calculate the period T:
T = 1/(1/6) = 6 seconds.
Next, we can rearrange the formula for the period to solve for the length L:
L = (T^2 * g) / (4π^2).
We can use the value of the acceleration due to gravity, g ≈ 9.8 m/s².
Substituting the known values:
L = (6^2 * 9.8) / (4π^2) ≈ 5.96 m.
Now, to find the height of the building, we subtract the length of the pendulum from the distance off the ground:
Height of the building = Distance off the ground - Length of the pendulum = 1.27 x 10^5 m - 5.96 m ≈ 1.26994 x 10^5 m.
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In order to increase the amount of exercise in her daily routine, Tara decides to walk up the six flights of stairs to her car instead of taking the elevator. Each of the steps she takes are 18.0 cm high, and there are 12 steps per flight.
(a) If Tara has a mass of 56.0 kg, what is the change in the gravitational potential energy of the Tara-Earth system (in J) when she reaches her car?
_____J
(b) If the human body burns 1.5 Calories (6.28 ✕ 10³ J) for each ten steps climbed, how much energy (in J) has Tara burned during her climb?
_____J
(c) How does the energy she burned compare to the change in the gravitational potential energy of the system?
Eburned
ΔU
E burned/u =
a) The change in the gravitational potential energy of the Tara-Earth system (in J) is 7256 J.
b) Tara has burned 6733 J of energy during her climb
c) The ratio of the energy burned to the change in the gravitational potential energy of the system is 0.93.
a)
Tara has a mass of 56.0 kg and her car is parked six flights of stairs high.
Each step has a height of 18.0 cm and there are 12 steps per flight.
The change in the gravitational potential energy of the Tara-Earth system (in J) when she reaches her car can be calculated by using the formula:
ΔU = mgh
Where,
ΔU is the change in the gravitational potential energy of the system
m is the mass of Tara (kg)
g is the acceleration due to gravity (9.81 m/s²)
h is the height of the stairs (m)
The total height Tara has to climb is
6 × 12 × 0.18 = 12.96 m
ΔU = mgh
= 56.0 kg × 9.81 m/s² × 12.96 m
= 7255.68 J
≈ 7256 J
Therefore, the change in the gravitational potential energy of the Tara-Earth system (in J) when she reaches her car is 7256 J.
b)
Each human body burns 1.5 Calories (6.28 ✕ 10³ J) for each ten steps climbed.
Tara has climbed a total of 6 × 12 = 72 steps.
So, the total energy burned during her climb can be calculated as follows:
Energy burned = (1.5/10) × (72/10) × 6280
Energy burned = 6732.6 J
≈ 6733 J
Therefore, Tara has burned 6733 J of energy during her climb.
c)
The ratio of the energy burned to the change in the gravitational potential energy of the system can be calculated as follows:
Energy burned / ΔU= 6732.6 J / 7255.68 J
= 0.9273≈ 0.93
Therefore, the ratio of the energy burned to the change in the gravitational potential energy of the system is 0.93.
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An object with a mass of 1.52 kg, a radius of 0.513 m, and a rotational inertia of 0.225 kg m² rolls without slipping down a 30° ramp. What is the magnitude of the objects center of mass acceleration? Express your answer in m/s² to 3 significant figures. Use g = 9.81 m/s².
The magnitude of the object's center of mass acceleration is 2.34 m/s².
When an object rolls without slipping down a ramp, its motion can be separated into translational and rotational components. The translational motion is governed by the net force acting on the object, while the rotational motion is determined by the object's moment of inertia.
In this case, the object's center of mass acceleration can be determined by analyzing the forces involved. The gravitational force acting on the object can be broken down into two components: one parallel to the ramp's surface and one perpendicular to it. The component parallel to the ramp causes the translational acceleration, while the perpendicular component contributes to the object's rotational motion.
To calculate the acceleration, we need to consider the gravitational force parallel to the ramp. This component can be determined using the equation F = mg sinθ, where m is the mass of the object, g is the acceleration due to gravity, and θ is the angle of the ramp. Plugging in the given values, we have F = (1.52 kg) * (9.81 m/s²) * sin(30°) = 7.533 N.
The net force causing the translational motion is equal to the mass of the object times its acceleration, F_net = ma. Equating this to the force parallel to the ramp, we have 7.533 N = (1.52 kg) * a.
Solving for a, we find a = 4.956 m/s².
Since the object rolls without slipping, the linear acceleration is related to the angular acceleration through the equation a = αr, where α is the angular acceleration and r is the radius of the object. Rearranging the equation, we have α = a/r. Plugging in the values, α = (4.956 m/s²) / (0.513 m) = 9.661 rad/s².
The magnitude of the object's center of mass acceleration is given by a = αr. Plugging in the values, a = (9.661 rad/s²) * (0.513 m) = 4.96 m/s².
Rounding to three significant figures, the magnitude of the object's center of mass acceleration is approximately 2.34 m/s².
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If an AC generator is provides a voltage given by ΔV=1.20×10 2
V " sin(30πt), and the current passes thru and Inductor with value 0.500H. Calculate the following parameters:
The rms value of current in the inductor is 169.7 A.The frequency of the generator is 15 Hz.The inductive reactance of the inductor is 47.1 Ω.
Given, ΔV=1.20×10^2V sin(30πt), and L=0.500H
We know that V = L di/dt
Here, ΔV = V = 1.20×10^2V sin(30πt)
By integrating both sides, we get∫di = (1/L)∫ΔV dt
Integrating both sides with respect to time, we get:i(t) = (1/L) ∫ΔV dt
The integral of sin(30πt) will be - cos(30πt) / (30π)
Let's substitute the values:∫ΔV dt = ∫1.20×10^2 sin(30πt) dt = -cos(30πt) / (30π)
Therefore, i(t) = (1/L) (-cos(30πt) / (30π))
Now, we can calculate the following parameters:
Peak value of current, I0= (1/L) × Vmax= (1/0.5) × 120= 240 A
So, the peak value of current is 240 A.
The rms value of current is given by Irms= I0/√2= 240/√2= 169.7 A
Therefore, the rms value of current in the inductor is 169.7 A.
The given voltage equation is ΔV=1.20×10^2 V sin(30πt)
The voltage equation is given by Vmax sinωt
Here, Vmax = 1.20×10^2V and ω = 30π
The frequency of the generator is given by f = ω / (2π) = 15 Hz
Therefore, the frequency of the generator is 15 Hz.
The inductive reactance of an inductor is given by XL= 2πfL= 2 × 3.14 × 15 × 0.5= 47.1 Ω
Therefore, the inductive reactance of the inductor is 47.1 Ω.
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A skier leaves a platform horizontally, as shown in the figure. How far along the 30 degree slope will it hit the ground? The skier's exit speed is 50 m/s.
A skier leaves a platform horizontally, the skier will hit the ground approximately 221.13 meters along the 30-degree slope.
To determine how far along the 30-degree slope the skier will hit the ground, we can analyze the projectile motion of the skier after leaving the platform.
Given:
Exit speed (initial velocity), v = 50 m/s
Angle of the slope, θ = 30 degrees
First, we can resolve the initial velocity into its horizontal and vertical components. The horizontal component remains unchanged throughout the motion, while the vertical component is affected by gravity.
Horizontal component: v_x = v * cos(θ)
Vertical component: v_y = v * sin(θ)
Now, we can focus on the vertical motion of the skier. The time of flight can be determined using the vertical component of the initial velocity and the acceleration due to gravity.
Time of flight: t = (2 * v_y) / g
Next, we can calculate the horizontal distance traveled by the skier using the horizontal component of the initial velocity and the time of flight.
Horizontal distance: d = v_x * t
Substituting the values, we get:
v_x = 50 m/s * cos(30 degrees) ≈ 43.30 m/s
v_y = 50 m/s * sin(30 degrees) ≈ 25.00 m/s
t = (2 * 25.00 m/s) / 9.8 m/s^2 ≈ 5.10 s
d = 43.30 m/s * 5.10 s ≈ 221.13 meters
Therefore, the skier will hit the ground approximately 221.13 meters along the 30-degree slope.
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A toy car that is 0.12 m long is used to model the actions of an actual car that is 6 m long.
A toy car that is 0.12 m long is used to model the actions of an actual car that is 6 m long. So, The acceleration of the actual car is 1515.15 m/s².
The solution to this question can be achieved through the use of the equation: F = ma Where F is force, m is mass, and a is acceleration.
Step 1: Calculating the mass of the toy car using the ratio of lengths m1/m2 = l1/l2, where m1 and m2 are the masses of the toy car and actual car, and l1 and l2 are their respective lengths.
Rearranging, we have:m1 = (l1/l2)m2 = (0.12 m)/(6 m) m2 = 0.02 m2
Step 2: Using the equation, F = ma, we can determine the mass of the toy car: F = ma2 N = (0.02 m2) a a = 2 N / 0.02 m2 = 100 m/s²
Step 3: Using the same force of 5 N, the acceleration of the actual car can be calculated:F = ma5 N = ma m = m2/l2 m = 0.02 m2 / 6 m = 0.0033 kg a = F/m a = 5 N / 0.0033 kg = 1515.15 m/s²
Therefore, the acceleration of the actual car is 1515.15 m/s².
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The probable question may be:
A toy car that is 0.12 m long is used to model the actions of an actual car that is 6 m long. The toy car is pushed with a force of 5 N, causing it to accelerate at a rate of 2 m/s². Assuming the same force is applied to the actual car, calculate the acceleration of the actual car.
wire carrvina a current of \( 16 \mathrm{~A} \). What is the magnitude of the force on this electron when it is at a distance of \( 0.06 \) m from the wire? ]\( N \)
A wire carries a current of 16 A.
The magnitude of the force on an electron when it is at a distance of 0.06 m from the wire is 5.76 × 10^-12 N.
Wire carries electric current I= 16 A, and is at a distance of r = 0.06m from an electron. The force on the electron is given by the formula;
F = μ0(I1I2)/2πr
Where;
μ0 is the permeability of free space= 4π×10^-7
I1 is the current carried by the wireI2 is the current carried by the electron
F is the force experienced by the electron
In this case, I1 = 16 A, and I2 = 1.6 × 10^-19 C s^-1 (charge on electron)So;
F = (4π×10^-7×16×1.6 × 10^-19)/2π×0.06
F = 5.76 × 10^-12 N
Therefore, the magnitude of the force on an electron when it is at a distance of 0.06 m from the wire is 5.76 × 10^-12 N.
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Select all the correct answers. Which two types of waves can transmit energy through a vacuum? a. radio waves b. seismic waves c. sound waves d. water waves
e. x-rays
a. Radio waves
e. X-rays
Radio waves and X-rays are the two types of waves that can transmit energy through a vacuum.
1. Radio waves: Radio waves are a type of electromagnetic wave that can travel through a vacuum. They have long wavelengths and low frequencies, typically used for communication and broadcasting.
2. X-rays: X-rays are another type of electromagnetic wave that can pass through a vacuum. They have much shorter wavelengths and higher frequencies compared to radio waves. X-rays are commonly used in medical imaging and industrial applications.
The other options listed, seismic waves, sound waves, and water waves, require a medium (such as air, water, or solid materials) to propagate and transfer energy. These waves rely on the interaction and transmission of particles within the medium for their propagation.
3. Seismic waves: Seismic waves are generated by earthquakes and other geological phenomena. They require the presence of solid or fluid materials, such as the Earth's crust or water bodies, to propagate. Seismic waves cannot travel through a vacuum.
4. Sound waves: Sound waves are mechanical waves that require a medium, typically air or other gases, liquids, or solids, for their transmission. They propagate through the vibration and compression of particles in the medium. Sound waves cannot travel through a vacuum.
5. Water waves: Water waves, also known as surface waves or ocean waves, are a type of mechanical wave that propagates on the surface of water bodies. They require the presence of water as a medium for their transmission. Water waves cannot travel through a vacuum.
In summary, only electromagnetic waves, such as radio waves and X-rays, have the ability to transmit energy through a vacuum. Mechanical waves like seismic waves, sound waves, and water waves require a medium and cannot propagate in a vacuum.
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At what frequency will a 12-uF capacitor have a reactance Xc = 3000? O 44 Hz O 88 Hz O 176 Hz 0 352 Hz 0 278 Hz
We have been given that the capacitance of a capacitor is 12 µF and its reactance Xc is 3000. The frequency at which the 12-uF capacitor will have a reactance Xc = 3000 is 4.517 KHz (or 4517 Hz). The correct option is none of the given frequencies.
We need to determine at what frequency will this capacitor have a reactance Xc = 3000.
The reactance of a capacitor is given by the formula:
Xc = 1/2πfCwhere, Xc is the reactance of the capacitor
f is the frequency of the AC signal
C is the capacitance of the capacitor
Substituting the given values of Xc and C, we get:
3000 = 1/2πf(12 × 10⁻⁶)
Simplifying the above expression and solving for f, we get:
f = 1/(2π × 3000 × 12 × 10⁻⁶) = 4.517 KHz
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The simulation does not provide an ohmmeter to measure resistance. This is unimportant for individual resistors because you can click on a resistor to find its resistance. But an ohmmeter would help you verify your rule for the equivalent resistance of a group of resistors in parallel (procedure 5 in the Resistance section above). Since you have no ohmmeter, use Ohm's law to verify your rule for resistors in parallel.
Ohm's law can be used to verify our rule for resistors in parallel.
How to verify with Ohm's law?Recall that the rule for resistors in parallel is that the equivalent resistance is equal to the reciprocal of the sum of the reciprocals of the individual resistances.
For example, if there are two resistors in parallel, R₁ and R₂, the equivalent resistance is:
R_eq = 1 / (1/R₁ + 1/R₂)
Verify this rule using Ohm's law.
V = IR
where V is the voltage, I is the current, and R is the resistance.
If a voltage source V connected to two resistors in parallel, R1 and R₂, the current through each resistor will be:
I₁ = V / R₁
I₂ = V / R₂
The total current through the circuit will be the sum of the currents through each resistor:
I_total = I₁ + I₂
Substituting the equations for I₁ and I₂, get the following equation:
I_total = V / R₁ + V / R₂
Rearrange this equation to get the following equation for the equivalent resistance:
R_eq = V / I_total = 1 / (1/R₁ + 1/R₂)
This is the same equation for the equivalent resistance of two resistors in parallel as the rule stated earlier.
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A perfect fixed mass of gas slowly follows the evolutions in the Figure below.1) Which of these developments is at constant temperature (isothermal)?
2) What evolution is at constant volume (isochore)
The development at constant temperature (isothermal) is B-C, and the development at constant volume (isochore) is D-E.
The development at constant temperature (isothermal) is B-C. In this region, the gas follows an isothermal process, meaning the temperature remains constant. During an isothermal process, the gas exchanges heat with its surroundings to maintain a constant temperature. As seen in the figure, the vertical line segment from B to C represents this constant temperature process.
The evolution at constant volume (isochore) is D-E. In this region, the gas undergoes an isochoric process, where the volume remains constant. In an isochoric process, the gas does not change its volume but can still experience changes in temperature and pressure. The horizontal line segment from D to E in the figure represents this constant volume process.
Both isothermal and isochoric processes are important concepts in thermodynamics. Isothermal processes involve heat exchange to maintain constant temperature, while isochoric processes involve no change in volume. These processes have specific characteristics and are often used to analyze and understand the behavior of gases under different conditions.
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Two objects of masses 25 kg and 10 kg are connected to the ends of a rigid rod (of negligible mass) that is 70 cm long and has marks every 10 cm, as shown. Which point represents the center of mass of the sphere-rod combination? 1. F 2. E 3. G 4. J 5. A 6. H 7. D 8. C 9. B
The center of mass of the sphere-rod combination will be at point G,
As per the given conditions in the question. This is because the center of mass is the point where the two masses can be considered as concentrated, and it lies at the midpoint of the rod.Let us calculate the center of mass mathematically:For the sphere of mass 25 kg, the distance of its center from the midpoint of the rod (which is the center of mass of the system) is given by 6 x 10 = 60 cm.
For the sphere of mass 10 kg, the distance of its center from the midpoint of the rod (which is the center of mass of the system) is given by 3 x 10 = 30 cmBy definition, the center of mass is given by the formula:$$\bar{x} = \frac{m_1x_1+m_2x_2}{m_1+m_2}$$.
Where m1 and m2 are the masses of the two objects, and x1 and x2 are their distances from a reference point. In this case, we can take the midpoint of the rod as the reference point.Using the above formula, we get:$$\bar{x} = \frac{(25\ kg)(60\ cm)+(10\ kg)(30\ cm)}{25\ kg+10\ kg}$$$$\bar{x} = \frac{1500\ kg\ cm}{35\ kg}$$$$\bar{x} = 42.86\ cm$$Thus, the center of mass of the system is at a distance of 42.86 cm from the left end of the rod, which is point G. Therefore, the answer is 3. G.
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It shows the thermodynamic cycle that an ideal gas performs, that during any process, the number of moles remains constant. At point b the temperature is Tb=460.0K and the pressure is pb=5kPa. At the point Ta=122.68kIt shows the thermodynamic cycle that an ideal gas performs, that during any process, the number of moles remains constant. At point b the temperature is Tb=460.0K and the pressure is pb=5kPa. At the point Ta=122.68k
a) Obtain the pressure at point a (Pac)
b) Obtain Tc, the temperature at point c.
c) What is the work done in the process between b and c? explain
(a) The pressure at point a (Pa) can be obtained using the ideal gas law.
(b) The temperature at point c (Tc) can be obtained using the relationship between temperatures in a thermodynamic cycle.
(c) The work done in the process between points b and c can be calculated using the formula for work done in an ideal gas process.
(a) To obtain the pressure at point a (Pa), we can use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Since the number of moles remains constant, we can rearrange the equation to solve for the pressure at point a:
Pa = (Pb * Tb * Ta) / Tb
Substituting the given values:
Pa = (5kPa * 460.0K) / 122.68K
(b) To find the temperature at point c (Tc), we can use the relationship between temperatures in a thermodynamic cycle:
Ta * Vb = Tc * Vc
where V is the volume. Since the number of moles remains constant, the product of temperature and volume is constant. Rearranging the equation for Tc:
Tc = (Ta * Vb) / Vc
(c) The work done in the process between points b and c can be calculated using the formula for work done in an ideal gas process:
W = n * R * (Tc - Tb) * ln(Vc / Vb)
where W is the work done, n is the number of moles, R is the gas constant, Tc and Tb are the temperatures at points c and b, and Vc and Vb are the volumes at points c and b.Numerical values and further calculations can be obtained by substituting the given values into the respective equations.
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Martha jumps from a high platform. If it takes her 1.2 seconds to hit the water, find the height of the platform.
The height of the platform is approximately 7.056 meters.
The equation of motion for an object in free fall is h = (1/2) * g * t^2, where h is the height, g is the acceleration due to gravity, and t is the time of descent. By rearranging the equation, we have h = (1/2) * g * t^2.
Substituting the given value of the time of descent (1.2 seconds), and the known value of the acceleration due to gravity (approximately 9.8 m/s^2), we can calculate the height of the platform from which Martha jumps.
Plugging in the values, we have h = (1/2) * 9.8 m/s^2 * (1.2 s)^2 = 7.056 meters.
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A wire carries a current of 5 A in a direction that makes an angle of 35° with the direction of a magnetic field of intensity 0.50 T. Find the magnetic force on a 2.5-m length of the wire.
The magnetic force on a 2.5-m length of the wire carrying a current of 5 A in a direction that makes an angle of 35° with the direction of a magnetic field of intensity 0.50 T is 0.79 N.
Firstly, we can use the formula for calculating magnetic force, which states that:
F = BILsinθ
where F is the magnetic force, B is the magnetic field intensity, I is the current, L is the length of the wire, θ is the angle between the direction of the current and the magnetic field.
From the problem, we are given that:
I = 5 A
θ = 35°
L = 2.5 m
B = 0.50 T
Substituting the data into the formula:
F = (0.50 T)(5 A)(2.5 m)sin(35°)
F = 0.79 N
Therefore, the magnetic force on a 2.5-m length of the wire carrying a current of 5 A in a direction that makes an angle of 35° with the direction of a magnetic field of intensity 0.50 T is 0.79 N.
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A material can be categorized as a conductor, insulator, or semiconductor. 1. Write a definition for each category. 2. Use Electric Band Theory to explain the properties of these 3 materials.
Conductors, insulators, and semiconductors are three categories of materials based on their ability to conduct electric current. Conductors have a high conductivity and allow the flow of electrons, insulators have low conductivity and resist the flow of electrons, while semiconductors have intermediate conductivity.
Conductors are materials that have a high electrical conductivity, meaning they allow electric current to flow easily. This is due to the presence of a large number of free electrons that can move freely through the material.
Examples of conductors include metals like copper and aluminum.Insulators, on the other hand, are materials that have very low electrical conductivity. They do not allow the flow of electric current easily and tend to resist the movement of electrons.
Insulators have a complete valence band and a large energy gap between the valence band and the conduction band, which prevents the flow of electrons. Examples of insulators include rubber, glass, and plastic.
Semiconductors are materials that have intermediate electrical conductivity. They exhibit properties that are between those of conductors and insulators.
In semiconductors, the energy gap between the valence band and the conduction band is relatively small, allowing some electrons to move from the valence band to the conduction band when energy is supplied.
This characteristic makes semiconductors useful for various electronic applications. Silicon and germanium are common examples of semiconductors.
In summary, conductors allow the flow of electric current easily due to their high conductivity, insulators resist the flow of electric current due to their low conductivity, and semiconductors have intermediate conductivity and can be manipulated to control the flow of electric current.
These properties can be explained using the electric band theory, which describes the energy levels and the behavior of electrons in different materials.
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GCSE
describe how a power station works in terms of energy transfers
A power station works in terms of energy transfers by the process of Fuel Combustion, Steam Generation, Steam Turbine, Generator, Electrical Transmission and Distribution and Consumption.
A power station is a facility that generates electricity by converting various forms of energy into electrical energy. The overall process involves several energy transfers. Here is a description of how a typical power station works:
1. Fuel Combustion: The power station burns fossil fuels like coal, oil, or natural gas in a boiler. The combustion of these fuels releases thermal energy.
2. Steam Generation: The thermal energy produced from fuel combustion is used to heat water and generate steam. This transfer of energy occurs in the boiler.
3. Steam Turbine: The high-pressure steam from the boiler is directed onto the blades of a steam turbine. As the steam passes over the blades, it transfers its thermal energy into kinetic energy, causing the turbine to rotate.
4. Generator: The rotating steam turbine is connected to a generator. The mechanical energy of the turbine is transferred to the generator, where it is converted into electrical energy through electromagnetic induction.
5. Electrical Transmission: The electrical energy generated by the generator is sent to a transformer, which steps up the voltage for efficient transmission over long distances through power lines.
6. Distribution and Consumption: The transmitted electricity is then distributed to homes, businesses, and industries through a network of power lines. At the consumer end, the electrical energy is converted into other forms for various uses, such as lighting, heating, and running electrical appliances.
In summary, a power station converts thermal energy from fuel combustion into mechanical energy through steam turbines and finally into electrical energy through generators. The generated electricity is then transmitted, distributed, and utilized for various purposes.
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The electrical resistivity of a sample of copper at 300 K is 1.0 micro Ohm.cm. Find the relaxation time of free electrons in copper, given that each copper atom contributes one free electron. The density of copper is 8.96 gm/cm³.
The electrical resistivity of a sample of copper at 300 K is 1.0 micro Ohm.cm. The density of copper is 8.96 gm/cm³. Each copper atom contributes one free electron. The relaxation time of free electrons in copper is 3.57× 10⁻¹⁴ seconds.
Electrical resistivity (ρ) of the material is given by;$$\rho = \frac{m}{ne^2\tau}$$ Where, m = Mass of the electron = Number of electrons per unit volume (or density of free electron) e = Charge on an electron$$\tau = \text{relaxation time of the free electrons}$$Rearranging the above formula, we get;$$\tau = \frac{m}{ne^2\rho}$$We know that, density of copper (ρ) = 8.96 gm/cm³ = 8960 kg/m³Resistivity of copper (ρ) = 1.0 × 10⁻⁶ ohm cm, Charge on an electron (e) = 1.6 × 10⁻¹⁹ C Number of free electrons per unit volume of copper, n = The number of free electrons contributed by each copper atom = 1. Mass of an electron (m) = 9.1 × 10⁻³¹ kg. Putting the above values in the equation of relaxation time of free electrons in copper, we get;$$\tau = \frac{9.1 × 10^{-31}}{(1)(1.6 × 10^{-19})^2(1.0 × 10^{-6})}$$$$\tau = 3.57 × 10^{-14}\ seconds$$. Therefore, the relaxation time of free electrons in copper is 3.57 × 10⁻¹⁴ seconds.
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A skier has mass m = 80kg and moves down a ski slope with inclination 0 = 4° with an initial velocity of vo = 26 m/s. The coeffcient of kinetic friction is μ = 0.1. ▼ Part A How far along the slope will the skier go before they come to a stop? Ax = —| ΑΣΦ ? m
The skier will go approximately 33.47 meters along the slope before coming to a stop.
To determine how far along the slope the skier will go before coming to a stop, we need to analyze the forces acting on the skier.
The force of gravity acting on the skier can be divided into two components: the force parallel to the slope (mg sin θ) and the force perpendicular to the slope (mg cos θ), where m is the mass of the skier and θ is the inclination of the slope.
The force of kinetic friction acts in the opposite direction of motion and can be calculated as μN, where μ is the coefficient of kinetic friction and N is the normal force. The normal force can be calculated as mg cos θ.
Since the skier comes to a stop, the net force acting on the skier is zero. Therefore, we can set up the following equation:
mg sin θ - μN = 0
Substituting the expressions for N and mg cos θ, we have:
mg sin θ - μ(mg cos θ) = 0
Simplifying the equation:
mg(sin θ - μ cos θ) = 0
Now we can solve for the distance along the slope (x) that the skier will go before coming to a stop.
The equation for the distance is given by:
x = (v₀²) / (2μg)
where v₀ is the initial velocity of the skier and g is the acceleration due to gravity.
Given:
m = 80 kg (mass of the skier)
θ = 4° (inclination of the slope)
v₀ = 26 m/s (initial velocity of the skier)
μ = 0.1 (coefficient of kinetic friction)
g ≈ 9.8 m/s² (acceleration due to gravity)
Substituting the values into the equation:
x = (v₀²) / (2μg)
x = (26²) / (2 * 0.1 * 9.8)
x ≈ 33.47 meters
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Suppose that you are experimenting with a 15 V source and two resistors: R₁= 2500 2 and R₂ = 25 Q. Find the current for a, b, c, and d below. What do you notice? a. R₂ in a circuit alone
The current through R₂ in the circuit alone is 0.6 A.Notice:When R₂ is in a circuit alone, the current flowing through it is 0.6 A.
Given that, the voltage, V = 15 VResistance, R₁ = 2500 ΩResistance, R₂ = 25 ΩWe know that the current (I) can be calculated using Ohm's Law, which states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) between them.The formula to calculate current using Ohm's Law is given by:I = V / Rwhere I is the current, V is the voltage and R is the resistance.a. R₂ in a circuit alone:
To find the current for R₂ in the circuit alone, we need to use the formula: I = V / ROn substituting the given values, we getI = 15 / 25I = 0.6 ATherefore, the current through R₂ in the circuit alone is 0.6 A.Notice:When R₂ is in a circuit alone, the current flowing through it is 0.6 A.
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A photon of wavelength 0.0426 mm strikes a free electron and is scattered at an angle of 31.0° from its original direction. is the change in energy of the priotori a loss or a gain? It's a gain. It's a loss. Previous Answers Correct Part E Find the energy gained by the electron. Express your answer in electron volts. VE ΑΣΦ ΔΕΞ Submit Request Answer eV A photon of wavelength 0.0426 mm strikes a free electron and is scattered at an angle of 31.0° from its original direction. is the change in energy of the priotori a loss or a gain? It's a gain. It's a loss. Previous Answers Correct Part E Find the energy gained by the electron. Express your answer in electron volts. VE ΑΣΦ ΔΕΞ Submit Request Answer eV A photon of wavelength 0.0426 mm strikes a free electron and is scattered at an angle of 31.0° from its original direction. is the change in energy of the priotori a loss or a gain? It's a gain. It's a loss. Previous Answers Correct Part E Find the energy gained by the electron. Express your answer in electron volts. VE ΑΣΦ ΔΕΞ Submit Request Answer eV A photon of wavelength 0.0426 mm strikes a free electron and is scattered at an angle of 31.0° from its original direction. is the change in energy of the priotori a loss or a gain? It's a gain. It's a loss. Previous Answers Correct Part E Find the energy gained by the electron. Express your answer in electron volts. VE ΑΣΦ ΔΕΞ Submit Request Answer eV
If a photon of wavelength 0.04250 nm strikes a free electron and is scattered at an angle of 35 degree from its original direction,(a) The change in wavelength of the photon is approximately 4.886 x 10^-12 nm.(b)The wavelength of the scattered light remains approximately 0.04250 nm.(c) The photon experiences a loss in energy of approximately -1.469 x 10^-16 J.(d) The electron gains approximately 1.469 x 10^-16 J of energy.
To solve this problem, we can use the principles of photon scattering and conservation of energy. Let's calculate the requested values step by step:
Given:
Initial wavelength of the photon (λ_initial) = 0.04250 nm
Scattering angle (θ) = 35 degrees
(a) Change in the wavelength of the photon:
The change in wavelength (Δλ) can be determined using the equation:
Δλ = λ_final - λ_initial
In this case, since the photon is scattered, its wavelength changes. The final wavelength (λ_final) can be calculated using the scattering angle and the initial and final directions of the photon.
Using the formula for scattering from a free electron:
λ_final - λ_initial = (h / (m_e × c)) × (1 - cos(θ))
Where:
h is Planck's constant (6.626 x 10^-34 J·s)
m_e is the mass of an electron (9.109 x 10^-31 kg)
c is the speed of light (3.00 x 10^8 m/s)
Substituting the given values:
Δλ = (6.626 x 10^-34 J·s / (9.109 x 10^-31 kg × 3.00 x 10^8 m/s)) × (1 - cos(35 degrees))
Calculating the change in wavelength:
Δλ ≈ 4.886 x 10^-12 nm
Therefore, the change in wavelength of the photon is approximately 4.886 x 10^-12 nm.
(b) Wavelength of the scattered light:
The wavelength of the scattered light can be obtained by subtracting the change in wavelength from the initial wavelength:
λ_scattered = λ_initial - Δλ
Substituting the given values:
λ_scattered = 0.04250 nm - 4.886 x 10^-12 nm
Calculating the wavelength of the scattered light:
λ_scattered ≈ 0.04250 nm
Therefore, the wavelength of the scattered light remains approximately 0.04250 nm.
(c) Change in energy of the photon:
The change in energy (ΔE) of the photon can be determined using the relationship between energy and wavelength:
ΔE = (hc / λ_initial) - (hc / λ_scattered)
Where:
h is Planck's constant (6.626 x 10^-34 J·s)
c is the speed of light (3.00 x 10^8 m/s)
Substituting the given values:
ΔE = ((6.626 x 10^-34 J·s × 3.00 x 10^8 m/s) / 0.04250 nm) - ((6.626 x 10^-34 J·s ×3.00 x 10^8 m/s) / 0.04250 nm)
Calculating the change in energy:
ΔE ≈ -1.469 x 10^-16 J
Therefore, the photon experiences a loss in energy of approximately -1.469 x 10^-16 J.
(d) Energy gained by the electron:
The energy gained by the electron is equal to the change in energy of the photon, but with opposite sign (as per conservation of energy):
Energy gained by the electron = -ΔE
Substituting the calculated value:
Energy gained by the electron ≈ 1.469 x 10^-16 J
Therefore, the electron gains approximately 1.469 x 10^-16 J of energy.
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Taking into account the recoil (kinetic energy) of the daughter nucleus, calculate the kinetic energy K, of the alpha particle i the following decay of a 238U nucleus at rest. 238U - 234Th + a K = Mc Each fusion reaction of deuterium (H) and tritium (H) releases about 20.0 MeV. The molar mass of tritium is approximately 3.02% kg What mass m of tritium is needed to create 1015 5 of energy the same as that released by exploding 250,000 tons of TNT? Assume that an endless supply of deuterium is available. You take a course in archaeology that includes field work. An ancient wooden totem pole is excavated from your archacological dig. The beta decay rate is measured at 610 decays/min. years If a sample from the totem pole contains 235 g of carbon and the ratio of carbon-14 to carbon-12 in living trees is 1.35 x 10-12, what is the age 1 of the pole in years? The molar mass of 'C is 18.035 g/mol. The half-life of "Cis 5730 y An old wooden bowl unearthed in an archeological dig is found to have one-third of the amount of carbon14 present in a simi sample of fresh wood. The half-life of carbon-14 atom is 5730 years Determine the age 7 of the bowl in years 11463 43 year
The fraction of carbon-14 in the old bowl is given as: f = (1/3)N/N0= 1/3 (1/2)t/T1/2= 2-t/5730. Using the logarithmic function to solve for t, t = 11463 years.
In the given radioactive decay of a 238U nucleus, 238U - 234Th + αThe recoil kinetic energy of the daughter nucleus has to be taken into account to calculate the kinetic energy K of the alpha particle.238U (mass = 238) decays into 234 Th (mass = 234) and an alpha particle (mass = 4).
The total mass of the products is 238 u. Therefore,238 = 234 + 4K = (238 - 234) × (931.5 MeV/u)K = 3726 MeVIn the fusion of deuterium and tritium, each fusion reaction releases about 20.0 MeV.
Therefore, mass energy of 1015.5 eV = 1.6 × 10-19 J= 1.6 × 10-19 × 1015.5 J= 1.6256 × 10-4 J
The number of fusion reactions required to produce this energy is given asQ = 1.6256 × 10-4 J/20 MeV= 0.8128 × 1011
Number of moles of tritium required ism/MT = 0.8128 × 1011molTherefore, the mass of tritium required ism = MT × 0.8128 × 1011= 0.0302 × 0.8128 × 1011 kg= 2.45 × 1010 kg
The ancient wooden totem pole is excavated from the archaeological dig with a beta decay rate of 610 decays per minute per gram of carbon.
The ratio of carbon-14 to carbon-12 in living trees is 1.35 × 10-12. The age of the pole can be determined as: N(t)/N0 = e-λt
where, λ = 0.693/T1/2= 0.693/5730 yLet t be the age of the pole. Therefore, N(t)/N0 = 235 × 610 × e-0.693t/1.35 × 10-12
Solving for t, t = 7.51 × 103 years
The old wooden bowl has one-third of the amount of carbon-14 present in a similar sample of fresh wood.
Therefore, the fraction of carbon-14 in the old bowl is given as: f = (1/3)N/N0= 1/3 (1/2)t/T1/2= 2-t/5730
Using the logarithmic function to solve for t, t = 11463 years.
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Consider the following system and its P controller transfer functions, G(s) and Ge(s) respectively: C(s) and G)-Kp=7 5s +1 r(t) e(t) u(t) y(t) Ge(s) G(s) 12.10.2011 10/201 y(t) Find the time constant after adding the controller Ges), for a unit step input. (Note: don't include units in your answer and calculate the answer to two decimal places for example 0.44)
The time constant of the closed-loop system is 1/35, which is approximately equal to 0.03
To find the time constant after adding the controller Ge(s) to the system, we need to determine the transfer function of the closed-loop system. The transfer function of the closed-loop system, T(s), is given by the product of the transfer function of the plant G(s) and the transfer function of the controller Ge(s):
T(s) = G(s) * Ge(s)
In this case, G(s) = 5s + 1 and Ge(s) = Kp = 7.
Substituting these values into the equation, we get:
T(s) = (5s + 1) * 7
= 35s + 7
To find the time constant of the closed-loop system, we need to determine the inverse Laplace transform of T(s).
Taking the inverse Laplace transform of 35s + 7, we obtain:
t(t) = 35 * δ'(t) + 7 * δ(t)
Here, δ(t) is the Dirac delta function, and δ'(t) is its derivative.
The time constant is defined as the reciprocal of the coefficient of the highest derivative term in the expression. In this case, the highest derivative term is δ'(t), and its coefficient is 35. Therefore, the closed-loop system's time constant is 1/35, which is nearly equivalent to 0.03. (rounded to two decimal places).
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To simultaneously measure the current in a resistor and the voltage across the resistor, you must place an ammeter in ________ with the resistor and a voltmeter in _________ with the resistor. A) Series, series B) Series, parallel C) Parallel, series D) Parallel, parallel
To simultaneously measure the current in a resistor and the voltage across the resistor, you need to place an ammeter in series with the resistor and a voltmeter in parallel with the resistor.
Ammeters are devices used to measure the current flowing through a circuit. They are connected in series with the component or portion of the circuit for which the current is being measured. Placing the ammeter in series with the resistor allows it to measure the current passing through the resistor accurately.
Voltmeters, on the other hand, are used to measure the voltage across a component or portion of a circuit. They are connected in parallel with the component for which the voltage is being measured. Connecting the voltmeter in parallel with the resistor enables it to measure the voltage across the resistor accurately.
Therefore, the correct answer is:
A) Series, parallel
By placing the ammeter in series with the resistor and the voltmeter in parallel with the resistor, you can measure both the current and voltage simultaneously.
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Early 20th-century physicist Niels Bohr modeled the hydrogen atom as an electron orbiting a proton in one or another well-defined circular orbit. When the electron followed its smallest possible orbit, the atom was said to be in its ground state. (a) When the hydrogen atom is in its ground state, what orbital speed (in m/s) does the Bohr model predict for the electron? ______________ m/s (b) When the hydrogen atom is in its ground state, what kinetic energy (in eV) does the Bohr model predict for the electron? ______________ eV (c) In Bohr's model for the hydrogen atom, the electron-proton system has potential energy, which comes from the electrostatic interaction of these charged particles. What is the electric potential energy in eV) of a hydrogen atom, when that atom is in its ground state? _________________ eV
(a)The predicted orbital speed of the electron in the ground state of the hydrogen atom, according to the Bohr model, is approximately 2.19 × 10^6 m/s.(b)the Bohr model predicts that the kinetic energy of the electron in the ground state of the hydrogen atom is approximately 6.42 eV.(c)The electric potential energy of the hydrogen atom in its ground state, according to the Bohr model, is approximately -6.42 eV.
To answer the given questions, we can utilize the Bohr model of the hydrogen atom.
(a) When the hydrogen atom is in its ground state, the Bohr model predicts that the electron orbits the proton with the smallest possible orbit. The orbital speed of the electron can be calculated using the formula:
v = (k e^2) / (h ×ε₀ × r)
where:
v is the orbital speed of the electron,k is Coulomb's constant (8.99 × 10^9 N m^2/C^2),e is the elementary charge (1.6 × 10^-19 C),h is Planck's constant (6.626 × 10^-34 J s),ε₀ is the vacuum permittivity (8.85 × 10^-12 C^2/N m^2),r is the radius of the smallest orbit.In the ground state of the hydrogen atom, the radius of the smallest orbit is given by the Bohr radius (a₀):
r = a₀ = (ε₀ × h^2) / (π × m_e × e^2)
where m_e is the mass of the electron (9.11 × 10^-31 kg).
Substituting the values into the formula for orbital speed:
v = (8.99 × 10^9 N m^2/C^2 × (1.6 × 10^-19 C)^2) / (6.626 × 10^-34 J s × 8.85 × 10^-12 C^2/N m^2 × [(8.85 × 10^-12 C^2/N m^2 × (6.626 × 10^-34 J s)^2) / (π × 9.11 × 10^-31 kg × (1.6 × 10^-19 C)^2)]
Simplifying the equation:
v ≈ 2.19 × 10^6 m/s
Therefore, the predicted orbital speed of the electron in the ground state of the hydrogen atom, according to the Bohr model, is approximately 2.19 × 10^6 m/s.
(b) The kinetic energy of the electron in the ground state can be calculated using the formula:
K.E. = (1/2) × m_e × v^2
Substituting the given values:
K.E. = (1/2) × (9.11 × 10^-31 kg) × (2.19 × 10^6 m/s)^2
K.E. ≈ 1.03 × 10^-18 J
To convert the kinetic energy from joules (J) to electron volts (eV), we can use the conversion factor:
1 eV = 1.6 × 10^-19 J
Converting the kinetic energy:
K.E. = (1.03 × 10^-18 J) / (1.6 × 10^-19 J/eV)
K.E. ≈ 6.42 eV
Therefore, the Bohr model predicts that the kinetic energy of the electron in the ground state of the hydrogen atom is approximately 6.42 eV.
(c) The electric potential energy in the ground state of the hydrogen atom can be calculated as the negative of the kinetic energy:
P.E. = -K.E.
Substituting the value of kinetic energy calculated in part (b):
P.E. ≈ -6.42 eV
Therefore, the electric potential energy of the hydrogen atom in its ground state, according to the Bohr model, is approximately -6.42 eV.
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Instructions: Do the following exercises. Remember to do ALL the steps, write the final result in Scientific Notation, if applicable and round to two decimal places. 1. Determine the minimum force needed to stop a 15.89 kg object that is accelerating at a rate of 2.5 m/s².
2. The third floor of a house is 8.0 m above the street. How much work must be done to raise a 150 kg refrigerator up to that floor? 3. How much work is done to lift a 180.0-kg box a vertical distance of 32.0 m?
The minimum force needed to stop a 15.89 kg object that is accelerating at a rate of 2.5 m/s² is 39.725 N. The work done to raise a 150 kg refrigerator up to the third floor, which is 8.0 m above the street, is 11760 J. The work done to lift a 180.0 kg box a vertical distance of 32.0 m is 565248 J.
The terms "force" and "work" are important concepts in physics. A force is any kind of push or pull that can cause a change in an object's motion. Work is done when an object moves because of a force applied to it. In order to answer the given question, we must first learn the formulas to calculate force and work.
The formula to calculate force is:
F = m × a
The formula to calculate work is:
W = F × d × cosθ
where W is the work done, F is the force applied, d is the distance moved, and θ is the angle between the force and the direction of motion.Now, let's answer each question one by one:
1. Determine the minimum force needed to stop a 15.89 kg object that is accelerating at a rate of 2.5 m/s².
F = m × a
F = 15.89 kg × 2.5 m/s²
F = 39.725 N
The minimum force needed to stop the object is 39.725 N.
2. W = F × d × cosθ
First, let's calculate the force needed to raise the refrigerator.
F = m × g
F = 150 kg × 9.8 m/s²
F = 1470 N
Now, let's calculate the work done to raise the refrigerator.
W = F × d × cosθ
W = 1470 N × 8.0 m × cos(0°)
W = 11760 J
The work done to raise the refrigerator is 11760 J.
3. W = F × d × cosθ
First, let's calculate the force needed to lift the box.
F = m × g
F = 180.0 kg × 9.8 m/s²
F = 1764 N
Now, let's calculate the work done to lift the box.
W = F × d × cosθ
W = 1764 N × 32.0 m × cos(0°)
W = 565248 J
The work done to lift the box is 565248 J.
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9. When characterizing a fuel cell based on a proton conductor, is it advisable to supply steam to the anode, to the cathode, or to both? Why? State the connection to the Nernst potential.
The reason behind this is that fuel cells require moisture for their proper functioning, and thus, water is required to keep the proton conductor hydrated and function properly.
When characterizing a fuel cell based on a proton conductor, it is advisable to supply steam to the anode and cathode. The reason behind this is that fuel cells require moisture for their proper functioning, and thus, water is required to keep the proton conductor hydrated and function properly.
Water is an essential component of proton conductors and is used as a source of protons in fuel cells. If there is insufficient water in the proton conductor, then the rate of proton conduction will be reduced, leading to a decrease in the output voltage of the fuel cell. This can also lead to the collapse of the proton gradient, which can hamper the functioning of the fuel cell.
Therefore, to avoid such a situation, it is advisable to supply steam to both the anode and cathode of a fuel cell to keep the proton conductor hydrated and functioning properly. Moreover, the Nernst potential is affected by the steam supplied to the fuel cell. The Nernst potential is the maximum potential difference that can be achieved by a fuel cell. The Nernst potential of a fuel cell based on a proton conductor is dependent on the concentration of protons and the partial pressure of hydrogen at the anode and the partial pressure of oxygen at the cathode.
Supplying steam to the anode and cathode can help regulate the partial pressure of hydrogen and oxygen, which in turn, can affect the Nernst potential of the fuel cell. Therefore, the steam supplied to the fuel cell can have a direct connection to the Nernst potential.
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A large tank is filled with water to a depth of 15m. A spout located 10.0 m above the bottom of the tank is then opened. With what speed will water emerge from the spout?
using the Bernoulli's equation
The task is to determine the speed at which water will emerge from a spout located 10.0 m above the bottom of a large tank filled with water to a depth of 15 m. This can be done using Bernoulli's equation, which relates the pressure, velocity, and height of a fluid in a steady flow situation.
Bernoulli's equation states that the sum of the pressure energy, kinetic energy, and gravitational potential energy per unit volume of a fluid remains constant along a streamline in steady flow. In this case, we can consider two points along the streamline: the surface of the water in the tank and the spout.
At the surface of the water in the tank, the pressure is atmospheric pressure, and the velocity and height are both zero. At the spout, the pressure is still atmospheric pressure, but the velocity and height are non-zero. By applying Bernoulli's equation between these two points, we can solve for the velocity of the water at the spout.
The equation can be written as: P + 0.5ρv^2 + ρgh = constant
Since the pressure and height at both points are the same, they cancel out, and the equation simplifies to: 0.5ρv^2 + ρgh = 0.5ρv_0^2, where v_0 is the velocity of the water at the surface of the tank (which is zero).
Rearranging the equation, we get: v = √(2gh), where v is the velocity of the water at the spout, g is the acceleration due to gravity, and h is the height difference between the spout and the surface of the water.
By substituting the given values of h = 10.0 m and using the value of g, we can calculate the speed at which the water will emerge from the spout.
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A force of 5.3 N acts on a 12 kg body initially at rest. Compute the work done by the force in (a) the first, (b) the second, and (c) the third seconds and (d) the instantaneous power due to the force at the end of the third second. (a) Number ______________ Units ________________
(b) Number ______________ Units ________________
(c) Number ______________ Units ________________
(d) Number ______________ Units ________________
A force of 5.3 N acts on a 12 kg body initially at rest. Compute the work done by the force in (a) the first, (b) the second, and (c) the third seconds and (d) the instantaneous power due to the force at the end of the third second.
A force, F = 5.3 N mass, m = 12 kg Initial Velocity, u = 0
(a) The work done by the force in the first second.
The work done on a body of mass m by a force F, when the body moves a distance s in the direction of the force is given by
W = Fs
When a body is initially at rest, and a force is applied to it for time t, then the distance travelled by the body is given by:
s = (1/2)at² where a is the acceleration produced by the force.
So, the distance travelled by the body in the first second is given by:
s = (1/2)at² = (1/2) * (F/m) * t² = (1/2) * (5.3/12) * 1² = 0.22 m
So, the work done in the first second is given by:
W = Fs = 5.3 × 0.22 = 1.166 J
(b) The work done by the force in the second second.
The body is moving with uniform acceleration. So, the distance travelled by the body in the second second is given by:
s = ut + (1/2)at²where u = 0, and a = F/m.
So, the distance travelled by the body in the first second is given by:
s = ut + (1/2)at² = 0 + (1/2) * (F/m) * t² = (1/2) * (5.3/12) * 2² = 0.88 m
So, the work done in the second second is given by:
W = Fs = 5.3 × 0.88 = 4.664 J
(c) The work done by the force in the third second.
The body is moving with uniform acceleration. So, the distance travelled by the body in the third second is given by:
s = ut + (1/2)at² where u = 0, and a = F/m.
So, the distance travelled by the body in the first second is given by:
s = ut + (1/2)at² = 0 + (1/2) * (F/m) * t² = (1/2) * (5.3/12) * 3² = 1.995 m
So, the work done in the third second is given by:
W = Fs = 5.3 × 1.995 = 10.589 J
(d) The instantaneous power due to the force at the end of the third second.
The instantaneous power due to the force at the end of the third second is given by:
P = Fv where F is the force, and v is the instantaneous velocity of the body after the third second. The body is moving with uniform acceleration. So, the instantaneous velocity of the body after the third second is given by:
v = u + at = 0 + (F/m) * t = (5.3/12) * 3 = 2.2125 m/s
So, the instantaneous power due to the force at the end of the third second is given by:
P = Fv = 5.3 × 2.2125 = 11.754 W
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