(a) The resistance of the wire is approximately 0.200 Ω.
(b) The total current flowing through the wire is approximately 1.300 A.
(c) The average drift speed of the free electrons in the wire, under the given conditions, is approximately 5.647 × 10^(-5) m/s.
(a) To calculate the resistance (R) of the wire, we can use the formula:
R = (ρ * L) / A
where ρ is the resistivity, L is the length of the wire, and A is the cross-sectional area of the wire.
Given that the diameter of the wire is 3.8 mm, we can calculate the radius (r) and the cross-sectional area (A):
r = (3.8 mm) / 2 = 1.9 mm = 1.9 × 10^(-3) m
A = π *[tex]r^2[/tex] = π * (1.9 × [tex]10^{(-3)} m)^2[/tex]
Using the resistivity value (1.07 × 10^(-7) Ωm) and the length of the wire (28 m), we can calculate the resistance:
R = (1.07 ×[tex]10^{(-7)[/tex]Ωm * 28 m) / (π * (1.9 × [tex]10^{(-3)[/tex] [tex]m)^2)[/tex]
R ≈ 0.200 Ω
Therefore, the resistance of the wire is approximately 0.200 Ω.
(b) The total current (I) can be determined using Ohm's law:
I = E / R
where E is the electric field magnitude and R is the resistance.
Given that the electric field magnitude (E) is 0.26 V/m, and the resistance (R) is 0.200 Ω, we can calculate the total current:
I = 0.26 V/m / 0.200 Ω
I ≈ 1.300 A
Hence, the total current flowing through the wire is approximately 1.300 A.
(c) The average drift speed (v) of the free electrons in the wire can be calculated using the formula:
v = (I / (n * A * e))
where I is the current, n is the number density of free electrons, A is the cross-sectional area of the wire, and e is the elementary charge.
Given that the electric field magnitude (E) is 2.4 V/m, and the number density of free electrons (n) is 8.5 × 10^28 electrons/m^3, we can calculate the average drift speed:
v = (2.4 V/m) / (8.5 ×[tex]10^{28} m^{(-3)[/tex] * A * e)
Substituting the known values for the cross-sectional area (A) and the elementary charge (e), we can calculate the average drift speed:
v ≈ 5.647 × [tex]10^{(-5)[/tex] m/s
Therefore, the average drift speed of the free electrons in the wire, under the given conditions, is approximately 5.647 × [tex]10^{(-5)[/tex] m/s.
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Explain why the Sun appears to move through the stars during the course of a year. How does the Sun's motion through the stars affect the constellations seen in the nighttime sky? 1. How is the distribution of electrons amone the perabiele ererzs levels in a degenerate cas diflerent than that in an ordinary gas? Mow do the properties of a degenerate tat satter from those of an ordinary gas? 2. How do astronomers know that the formation of planetary nebulae is a common occurtence dutime the evolution of medium-mass stars? B 3. Why do the stars in a cluster evolve at different rates? Explain how the H-R diagram of a cluster of stars can be used to find the age of the cluster. 4. Explain how the distance to a Cepheid variable star can be determined from its light curve.
The relationship between a Cepheid variable's luminosity and pulsation period has been established as a way to estimate the distance to the star.
How is the distribution of electrons among the probable energy levels in a degenerate case different from that in an ordinary gas? How do the properties of a degenerate gas differ from those of an ordinary gas? In a degenerate gas, the electrons are compacted in the lower energy levels and become tightly jammed. As a result, their distribution varies from the probable energy levels predicted by the Maxwell-Boltzmann statistics. The most important property of a degenerate gas is that its pressure is not connected to its temperature, unlike an ordinary gas. When the pressure of an ordinary gas is decreased, the molecules move slower, and the temperature drops. This is not the case with a degenerate gas. Because of the limitations of quantum mechanics, the electrons in a degenerate gas are so tightly packed that they cannot be further compressed. The gas pressure is caused by electron compression and is proportional to the number of electrons in the gas.
How do astronomers know that the formation of planetary nebulae is a common occurrence during the evolution of medium-mass stars? Astronomers know that planetary nebulae formation is a common event during the evolution of medium-mass stars since roughly 10% of all stars have a mass between 1 and 8 solar masses. These stars lose a large portion of their original mass when they transform into planetary nebulae in the later phases of their lives. Planetary nebulae may have played a crucial role in the formation of the Milky Way's interstellar medium and the cycles of star formation and interstellar matter redistribution that exist in the universe.
Why do the stars in a cluster evolve at different rates? Explain how the H-R diagram of a cluster of stars can be used to find the age of the cluster. The stars in a cluster evolve at different rates due to variations in their initial mass. Massive stars, for example, evolve much more quickly than less massive stars and die as supernovae. Star clusters are valuable laboratories for testing our theories about stellar evolution since all of the stars were formed at the same time from the same material. By analyzing the H-R diagram of a star cluster, we can determine the age of the cluster. This is due to the fact that the brightness and surface temperature of a star are both dependent on its mass and stage of evolution.
Explain how the distance to a Cepheid variable star can be determined from its light curve. The relationship between a Cepheid variable's luminosity and pulsation period has been established as a way to estimate the distance to the star. The period of a Cepheid variable star is directly linked to its absolute luminosity: brighter stars have longer periods. When we determine the star's period and apparent brightness, we can use this relationship to calculate the star's absolute brightness. The distance to the star may be calculated once we know its actual brightness and apparent brightness. The period-luminosity relationship for Cepheid variables was discovered by Henrietta Swan Leavitt in 1912.
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An acgenerator has a frequency of 6.5kHz and a voltage of 45 V. When an inductor is connected between the terminals of this generator, the current in the inductor is 65 mA. What is the inductance of the inductor? L= Attempts: 0 of Sersed Using multiple attempts will impact your score. 5% score reduction after attempt 3
The inductance of the inductor connected between the terminals of this generator is 10.77 millihenries (mH).
In an AC circuit, the relationship between voltage, current, frequency, and inductance can be described using the formula V = I * X_L, where V is the voltage, I is the current, and X_L is the inductive reactance.
To find the inductance, we need to rearrange the formula as L = X_L / (2πf), where L represents the inductance and f is the frequency.
Given that the frequency is 6.5 kHz and the current is 65 mA, we first need to convert the current to amperes (A) by dividing it by 1000.
Next, we calculate the inductive reactance (X_L):
X_L = V / I,
X_L = 45 V / (65 mA / 1000) = 692.31 Ω.
Finally, we can find the inductance:
L = X_L / (2πf),
L = 692.31 Ω / (2π * 6500 Hz) ≈ 0.01077 H.
Converting the inductance to millihenries:
0.01077 H * 1000 ≈ 10.77 mH.
Therefore, the inductance of the inductor is approximately 10.77 millihenries (mH)
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You are given a black box circuit and you are to apply an input vi(t)=3u(t)V. The voltage response can be described by vo(t)=(5e−8t−2e−5t)V for t≥0. What will be the steady-state response of the circuit if you apply another input voltage described by vi(t)=100cos6t V for t≥0 ?
The steady-state response of the circuit to the input voltage vi(t) = 100cos(6t) V is given by vo(t) = 100*cos(6t + φ) V
To determine the steady-state response of the circuit to the input voltage described by vi(t) = 100cos(6t) V, we need to find the response after transient effects have settled. The given voltage response vo(t) = 5e^(-8t) - 2e^(-5t) V is the transient response for the previous input.
To find the steady-state response, we need to find the particular solution that corresponds to the new input. Since the input is a sinusoidal signal, we assume the steady-state response will also be sinusoidal with the same frequency.
1. Find the steady-state response of the circuit for the new input voltage:
We assume the steady-state response will be of the form vp(t) = A*cos(6t + φ), where A is the amplitude and φ is the phase angle to be determined.
2. Apply the new input voltage to the circuit:
vi(t) = 100cos(6t) V
3. Find the output voltage in the steady-state:
vo(t) = vp(t)
4. Substitute the input and output voltages into the equation:
100cos(6t) = A*cos(6t + φ)
5. Compare the coefficients of the same terms on both sides of the equation:
100 = A (since the cos(6t) terms are equal)
6. Solve for the amplitude A:
A = 100
7. The steady-state response of the circuit for the new input voltage is:
vo(t) = 100*cos(6t + φ) V
Therefore, the steady-state response of the circuit to the input voltage vi(t) = 100cos(6t) V is given by vo(t) = 100*cos(6t + φ) V, where φ is the phase angle that depends on the initial conditions of the circuit.
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A 1.40-m-long metal bar is pulled to the right at a steady 4.8 m/s perpendicular to a uniform, 0.715-T magnetic field. The bar rides on parallel metal rails connected through R=25.8−Ω, as shown in the figure, so the apparatus makes a complete circuit. You can ignore the resistance of the bar and the rails. Calculate the magnitude of the emf induced in the circuit. 4,8 V 0.186 V 2,45 V 124 V
The magnitude of the emf induced in the circuit is 124 V.
When a metal bar is pulled at a steady rate through a magnetic field, an electromotive force (emf) is induced. This emf is caused by a change in the magnetic flux that passes through the circuit that the bar is a part of.
According to Faraday’s law, the magnitude of this induced emf is equal to the rate of change of the magnetic flux, or emf=−NΔΦΔt, where N is the number of turns in the circuit, and ΔΦΔt is the rate of change of the magnetic flux that passes through each turn of the circuit. In this case, the bar is being pulled through a uniform magnetic field of 0.715 T at a steady rate of 4.8 m/s.
The magnetic flux that passes through the circuit is then equal to BAh, where A is the area of each turn of the circuit, h is the height of each turn of the circuit, and B is the strength of the magnetic field. Since the bar is moving perpendicular to the magnetic field, the area of each turn of the circuit that the bar moves through is simply equal to the length of the bar times the height of each turn.
Therefore, A=1.40m×h. The rate of change of the magnetic flux is then equal to BAdhdt, where dhdt is the rate at which the bar is moving through the circuit.
Therefore, emf=−NABdhdt=−NABv. In this case, the bar is connected to parallel metal rails connected through R=25.8Ω, which form a complete circuit.
The induced emf then drives a current I=emfR through this circuit. Since the resistance of the bar and the rails is ignored, the induced emf is simply equal to the voltage across the resistance R, or emf=IR.
Therefore, emf=I(R)=−NABvR.
Substituting the given values, we have emf=−1×0.715×(1.40m×h)×4.8ms−1×25.8Ω=−124V.
Hence the magnitude of the emf induced in the circuit is 124 V.
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A hollow metal sphere has 5 cmcm and 9 cmcm inner and outer radii, respectively, with a point charge at its center. The surface charge density on the inside surface is −250nC/m2−250nC/m2 . The surface charge density on the exterior surface is +250nC/m2+250nC/m2 .
What is the strength of the electric field at point 12 cm from the center?
Therefore, the strength of the electric field at a distance of 12 cm from the center of the sphere is 10125 NC-1.
The electric field due to a uniformly charged hollow sphere at any point outside the sphere is given by E = kQ/r2 where k is the Coulomb constant, Q is the charge on the sphere, and r is the distance from the center of the sphere to the point where electric field is to be determined.
The electric field inside the hollow sphere is zero as there is no charge inside.Let's first calculate the charge on the sphere. The charge on the sphere can be calculated by surface charge density * surface areaQ = σAσA = surface charge density * area of the sphere = σ * 4πr2So, for the inner surface, Q = -250 * 4π * 5² * 10⁻⁹ CFor the outer surface, Q = 250 * 4π * 9² * 10⁻⁹ CSo,
the total charge on the sphere isQ = -250 * 4π * 5² * 10⁻⁹ + 250 * 4π * 9² * 10⁻⁹ CQ = 18 * 10⁻⁶ CNow, we need to find the electric field at a distance of 12 cm from the center of the sphere.Electric field, E = kQ/r²E = 9 * 10^9 * 18 * 10^-6 / (0.12)²E = 10125 NC-1
Therefore, the strength of the electric field at a distance of 12 cm from the center of the sphere is 10125 NC-1.
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3cos(wt/3), where I is in meters and t in seconds. The acceleration of the particle The position of a partide is given by in my when2mis 249 2.1 275 228
The given equation represents the position of a particle as a function of time, given by x(t) = 3cos(wt/3), where x is in meters and t is in seconds. To find the acceleration of the particle, we need to take the second derivative of the position function with respect to time.
The first derivative of x(t) gives us the velocity function v(t):
v(t) = dx(t)/dt = -3w/3 * sin(wt/3)
Differentiating again, we find the second derivative, which is the acceleration function a(t):
a(t) = dv(t)/dt = d²x(t)/dt² = (-3w/3)² * cos(wt/3)
Simplifying further, we get:
a(t) = w² * cos(wt/3)
The acceleration of the particle, a(t), is given by w² times the cosine of wt/3.
In the given context, the values of w, which is the angular frequency, are not provided. Therefore, we cannot determine the specific numerical value of the acceleration. However, we can analyze its behavior based on the equation. The acceleration is directly proportional to w², meaning that increasing the value of w will result in a larger acceleration. Additionally, the cosine function oscillates between -1 and 1, so the acceleration will oscillate between -w² and w².
In summary, the acceleration of the particle is given by the equation a(t) = w² * cos(wt/3). The specific numerical value of the acceleration depends on the value of the angular frequency w, which is not provided in the given information.
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What is the starting angular velocity of an elementary particle in the following circumstance? The particle moves through a radius of 4.2 m with an angular acceleration of 1.32 rad/s2. The process ends with a linear velocity of 28.2 m/s and takes 6.1 seconds to complete.
The starting angular velocity of the elementary particle can be determined. Therefore, the starting angular velocity of an elementary particle in the following circumstance is 0 rad/s.
The relationship between linear velocity (v), angular velocity (ω), and radius (r) is given by the equation v = ωr. From the given information, we know the linear velocity at the end of the process is 28.2 m/s and the radius is 4.2 m. Therefore, we can calculate the final angular velocity using the equation v = ωr.
v = ωr
28.2 = ω * 4.2
To find the starting angular velocity, we need to consider the angular acceleration and the time taken to complete the process. The equation relating angular acceleration (α), time (t), and angular velocity (ω) is ω = ω0 + αt, where ω0 is the initial angular velocity.
Using the given information, we have α = 1.32 rad/s^2 and t = 6.1 s. By rearranging the equation, we can solve for ω0:
ω = ω0 + αt
28.2 = ω0 + (1.32 * 6.1)
By substituting the values and solving for ω0, we can determine the starting angular velocity of the elementary particle in this circumstance.
Therefore, the starting angular velocity of an elementary particle in the following circumstance is 0 rad/s.
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A plastic rod of length 1.54 meters contains a charge of 1.9nC. The rod is formed into semicircle. What is the magnitude of the electric field at the center of the semicircle? Express your answer in N/C A silicon rod of length 2.30 meters contains a charge of 5.8nC. The rod is formed into a quartercircle What is the magnitude of the electric field at tho center? Express your answer in N/C
the electric field at the center of the quarter circle is E = 2.29 × 107 N/C.Therefore, the magnitude of the electric field at the center of the semicircle is 1.12 × 107 N/C, and the magnitude of the electric field at the center of the quarter circle is 2.29 × 107 N/C.
The electric field at the center of a semicircle or quarter circle can be determined by considering the contributions from each segment of the rod. Each segment can be treated as a point charge, and the electric field at the center can be obtained by summing the contributions from all segments.
For the semicircle formed by the plastic rod, the electric field at the center can be calculated using the formula:E = k * (Q / r²),where E is the electric field, k is the Coulomb's constant, Q is the charge on the rod, and r is the radius of the semicircle (which is equal to half the length of the rod).
Similarly, for the quarter circle formed by the silicon rod, the electric field at the center can be calculated using the same formula, taking into account the appropriate length and charge.By plugging in the given values into the formula, the magnitudes of the electric fields at the centers of the semicircle and quarter circle can be determined.
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Look at the circuit diagram.
What type of circuit is shown?
open series circuit
open parallel circuit
closed series circuit
closed parallel circuit
The type of circuit shown in the diagram is a closed series circuit. The Option C.
What type of circuit is depicted in the circuit diagram?The circuit diagram illustrates a closed series circuit, where the components are connected in a series, forming a single loop. In a closed series circuit, the current flows through each component in sequence, meaning that the current passing through one component is the same as the current passing through the other components.
The flow of current is uninterrupted since the circuit forms a complete loop with no breaks or open paths. Therefore, the correct answer is a closed series circuit.
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During 9.839.83 s, a motorcyclist changes his velocity from
1,x=−41.1v1,x=−41.1 m/s and 1,y=14.7v1,y=14.7 m/s to
2,x=−23.7v2,x=−23.7 m/s and 2,y=28.9v2,y=28.9 m/s.
During 9.839.83 s, a motorcyclist changes his velocity from 1,x=−41.1v1,x=−41.1 m/s and 1,y=14.7v1,y=14.7 m/s to 2,x=−23.7v2,x=−23.7 m/s and 2,y=28.9v2,y=28.9 m/s.
During the time interval of 9.83 s, a motorcyclist's velocity changes from (-41.1 m/s, 14.7 m/s) to (-23.7 m/s, 28.9 m/s). The initial velocity of the motorcyclist (v1) is (-41.1 m/s, 14.7 m/s).
The final velocity of the motorcyclist (v2) is (-23.7 m/s, 28.9 m/s).
The magnitude of the change in velocity (|Δv|) can be calculated using the formula:
|Δv| = √[(v2,x - v1,x)² + (v2,y - v1,y)²]
|Δv| = √[(-23.7 - (-41.1))² + (28.9 - 14.7)²]
|Δv|= √[322.56 + 202.5]
|Δv| = √525.06
|Δv| = 22.92 m/s
The direction of the change in velocity (θ) can be calculated using the formula:
θ = tan⁻¹[(v2,y - v1,y) / (v2,x - v1,x)]
θ = tan⁻¹[(28.9 - 14.7) / (-23.7 - (-41.1))]
θ = tan⁻¹[14.2 / 17.4]
θ = 42.1°
The change in velocity is 22.92 m/s in the direction of 42.1°.
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If an electron (mass =9.1×10 −31
kg ) is released at a speed of 4.9×10 5
m/s in a direction perpendicular to a uniform magnetic field, then moves in a circle of radius 1.0 cm, what must be the magnitude of that field? μTx
The magnitude of the field is 1.41 × 10^-3 T.
When a charged particle moves in a magnetic field perpendicular to the magnetic field, the Lorentz force acts as a centripetal force causing the charged particle to move in a circle. The centripetal force is given by the relation: F = ma = (mv²)/r.
Where m is the mass of the charged particle, v is the velocity of the charged particle, r is the radius of the circle and a is the acceleration of the charged particle due to the magnetic field.Based on the information given in the question;Mass of the electron, m = 9.1 × 10^-31 kgVelocity of the electron, v = 4.9 × 10^5 m/s.
Radius of the circle, r = 1.0 cm = 0.01 mThe force acting on the electron due to the magnetic field is given by the relation: F = qvB. Where q is the charge of the electron, v is the velocity of the electron and B is the magnetic field strength.
Since the force acting on the electron is the centripetal force, equating these two forces we get: F = mv²/r = qvB. Therefore, B = mv/rq = (9.1 × 10^-31 kg × (4.9 × 10^5 m/s))/((0.01 m) × 1.6 × 10^-19 C) = 1.41 × 10^-3 T.So, the magnitude of the magnetic field is 1.41 × 10^-3 T.Answer: The magnitude of the field is 1.41 × 10^-3 T.
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How wide is the central maximum in degrees and cm? (wavelength=670nm) (L=30.0cm) (w=1.2E-5m)
To calculate the width of the central maximum in degrees, we can use the formula: θ = λ / w
The width of the central maximum is approximately 1.6749 cm.
The width of the central maximum is approximately 3.19 degrees.
Given:
Wavelength (λ) = 670 nm = 670 × 10⁻⁹ m
Width of the slit (w) = 1.2 × 10⁻⁵ m
Substituting these values into the formula:
θ = (670 × 10⁻⁹ m) / (1.2 × 10⁻⁵ m)
θ ≈ 0.05583 radians
To convert the angular width from radians to degrees, we can use the conversion factor:
1 radian = 180 degrees / π
θ° = θ × (180 degrees / π)
θ° ≈ 3.19 degrees
Therefore, the width of the central maximum is approximately 3.19 degrees.
To calculate the width of the central maximum in centimeters, we can use the formula:
Width(cm) = L × θ
where L is the distance from the slit to the screen and θ is the angular width.
Given:
Distance from the slit to the screen (L) = 30.0 cm
Substituting the values:
Width(cm) = (30.0 cm) × (0.05583 radians)
Width(cm) ≈ 1.6749 cm
Therefore, the width of the central maximum is approximately 1.6749 cm.
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A batter hits a baseball in a batting-practice cage. The ball undergoes an average acceleration of 5.4x 103 m/s2 [W] in 2.12 x 10-2 s before it hits the cage wall. Calculate the velocity of the baseball when it hits the wall.
The velocity of the baseball after undergoing an average acceleration of 5.4x 103 m/s2 when it hits the wall is 114.48 m/s.
Average acceleration = 5.4 x 10³ m/s²
Time taken, t = 2.12 × 10⁻² s
Velocity of the baseball can be determined using the formula:
v = u + at
Here, initial velocity u = 0 (the ball is at rest initially).
Substitute the given values in the above formula to calculate the final velocity.
v = u + at
v = 0 + (5.4 x 10³ m/s²) (2.12 x 10⁻² s)v = 114.48 m/s
Therefore, the velocity of the baseball when it hits the wall is 114.48 m/s.
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A particle with charge 4 µC is located at the origin of a reference frame and two other identical particles with the same charge are located 3 m and 3 m from the origin on the X and Y axis, respectively. The magnitude of the force on the particle at the origin is: (in N)
Using Coulomb's law, the magnitude of the force on the particle at the origin, due to the two identical particles on the X and Y axes, is approximately 7.99 x 10⁻³ N.
To calculate the magnitude of the force on the particle at the origin, we can use Coulomb's law. Coulomb's law states that the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. The formula for the force between two charged particles is:
F = (k * |q1 * q2|) / r^2
Where:
F is the magnitude of the force,
k is the Coulomb's constant (k = 8.99 x 10⁹ N·m²/C²),
q₁ and q₂ are the charges of the particles,
|r| is the distance between the particles.
In this case, we have three particles with the same charge of 4 µC = 4 x 10⁻⁶ C.
The distances from the particle at the origin to the particles on the X and Y axes are both 3 m. Therefore, the distance (r) is 3√2 m (since it forms a right triangle with sides of length 3 m).
Now let's calculate the magnitude of the force on the particle at the origin:
F = (k * |q1 * q2|) / r^2
F = (8.99 x 10⁹ N·m²/C² * |4 x 10^(-6) C * 4 x 10⁻⁶ C|) / (3√2 m)²
F = (8.99 x 10⁹ N·m²/C² * 16 x 10¹² C²) / (18 m²)
F = (143.84 x 10⁻³ N·m²/C²) / (18 m²)
F = 7.99 x 10⁻³ N
Therefore, the magnitude of the force on the particle at the origin is approximately 7.99 x 10⁻³ N.
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The position of a particle is r(t) = (2.5t²x + 4y − 4tz) m. a. Determine its velocity and acceleration as a function of time. v(t) = (____ x + ____ ŷ + ____ z) m/s a(t) = (____ x + ____ ŷ + ____ z) m/s².
b. What are its velocity and acceleration at time t = 0? v(t = 0) = ______ m/s a (t=0) = _______ m/s²
The velocity of the particle is given by v(t) = (5tx i - 4z j) m/s. The acceleration of the particle is given by a(t) = (5x i - 4z j) m/s². The velocity of the particle at time t=0 is 0 m/s, and acceleration of the particle at time t=0 is 4k m/s².
The position of the particle is described by the function r(t) = (2.5t²x + 4y − 4tz) in meters.
a) Velocity, v(t) = dr(t)/dt
Velocity represents the speed at which an object's position changes over time. Let's differentiate r(t) with respect to time, we get,
v(t) = dr(t)/dt
= d/dt (2.5t²x + 4y − 4tz)
= 5tx i - 4z j
So, the velocity of the particle is given by v(t) = (5tx i - 4z j) m/s
Acceleration, a(t) = dv(t)/dt
Acceleration indicates how the velocity of an object changes over time. Let's differentiate v(t) with respect to time, we get,
a(t) = dv(t)/dt
= d/dt (5tx i - 4z j)
= 5x i + 0 j - 4k
So, the acceleration of the particle is given by a(t) = (5x i - 4z j) m/s²
b) We need to find the velocity and acceleration of the particle at time t = 0.
v(t = 0) = 5 * 0 * 0 i - 4 * 0 j = 0a (t=0) = 5 * 0 i - 4 * 0 j + 4k = 4k
The velocity of the particle at time t=0 is 0 m/s, and acceleration of the particle at time t=0 is 4k m/s².
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The Maxwell speed distribution (a) Verify from the Maxwell speed distribution that the most likely speed of a molecule is √2kT/m. - (b) Use a computer to plot the Maxwell speed distribution for nitrogen molecules at T 300 K and T 600 K. Plot both graphs on the same axes, and label the axes values.
The Maxwell speed distribution of a gas is given by the expression,1. f(v) = (m/2πkT)3/2 exp[-m*v2/2kT]. Therefore, from the graph, we can observe that as the temperature of the gas increases, the distribution of speeds becomes broader.
Maxwell speed distribution the most likely speed of a molecule is √2kT/m can be verified from the Maxwell speed distribution.
The Maxwell speed distribution of a gas is given by the expression,1. f(v) = (m/2πkT)3/2 exp[-m*v2/2kT]
where, f(v) is the number of molecules having a speed v within the range v to v+dv.
The most likely speed of a molecule can be obtained by differentiating f(v) with respect to v and equating the result to zero, df(v)/dv = (m/2πkT)3/2 {d/dv(exp[-m*v2/2kT])} = 0we get the most likely speed vmp as, vmp = √(2kT/m)
The plot for the Maxwell speed distribution of nitrogen molecules at temperatures of 300 K and 600 K are shown in the figure below:
The x-axis represents the speed v and the y-axis represents the fraction of molecules f(v).
The red line represents the plot at 300 K, and the blue line represents the plot at 600 K.
Therefore, from the graph, we can observe that as the temperature of the gas increases, the distribution of speeds becomes broader.
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A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m>s. Assuming that air resistance can be ignored, find (a) the initial speed of the rock and (b) the greatest height of the rock as measured from the base of the cliff.
The initial speed of the rock is 14.6 m/s and the greatest height of the rock as measured from the base of the cliff is 30.08 m.
Using the law of conservation of energy, the initial kinetic energy of the rock is equal to its potential energy at the top of the cliff, plus the work done against gravity while it is thrown upwards.
Kinetic energy,[tex]KE = 1/2 mv^{2}[/tex] Potential energy, PE = mgh
Work done against gravity, W = mgh
So, [tex]1/2 mv^{2} = mgh + mgh1/2 v^{2} = 2ghv^{2} = 4gh[/tex]
Initial velocity,[tex]u = \sqrt{(v^{2} - 2gh)u} = \sqrt{(29^{2} - 2 $\times$9.8 $\times$ 32)u} = \sqrt{(841 - 627.2)u } = \sqrt{213.8u } = 14.6 m/s[/tex]
Therefore, the initial speed of the rock is 14.6 m/s.
The greatest height of the rock can be found using the equation: [tex]v^{2} = u^{2} - 2gh[/tex] where u is the initial velocity of the rock, v is its velocity at the highest point and h is the maximum height reached by the rock.
At the highest point, v = 0.
So, [tex]0^{2} = (14.6)^{2} - 2gh, h = (14.6)^{2} / 2g h = 30.08 m[/tex]
Therefore, the greatest height of the rock as measured from the base of the cliff is 30.08 m.
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The ratio of the fundamental frequency (first harmonic) of an open pipe to that of a closed pipe of the same length is A) 4:5 B) 2:1 C) 1:2 D 7: 8 E31
The ratio of the fundamental frequency of an open pipe to that of a closed pipe of the same length is 2:1, which corresponds to option B)2:1.
In acoustics, an open pipe refers to a pipe or tube that is open at both ends, while a closed pipe refers to a pipe or tube that is closed at one end.
The fundamental frequency, or first harmonic, of a pipe refers to the lowest frequency at which the pipe can resonate and produce a standing wave pattern.
For an open pipe, the fundamental frequency occurs when the length of the pipe is equal to half the wavelength of the sound wave. Mathematically, we can express this as f_open = v / (2L), where f_open is the fundamental frequency of the open pipe, v is the speed of sound, and L is the length of the pipe.
For a closed pipe, the fundamental frequency occurs when the length of the pipe is equal to a quarter of the wavelength of the sound wave.
Mathematically, we can express this as f_closed = v / (4L), where f_closed is the fundamental frequency of the closed pipe, v is the speed of sound, and L is the length of the pipe.
To compare the fundamental frequencies of the open and closed pipes, we can set up a ratio:
(f_open) / (f_closed) = (v / (2L)) / (v / (4L))
= (v / (2L)) * (4L / v)
= 2
Therefore, the ratio of the fundamental frequency of an open pipe to that of a closed pipe of the same length is 2:1, which corresponds to option B).
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What distance does an oscillator of amplitude a travel in 9. 5 periods?
Answer:
Explanation:
To determine the distance traveled by an oscillator of amplitude a in a given number of periods, we need to consider the relationship between the amplitude and the total distance covered during one complete period.
In simple harmonic motion, the displacement of an oscillator is given by the equation:
x = A * sin(2π/T * t)
Where:
x is the displacement at time t,
A is the amplitude of the oscillator,
T is the period of the oscillator, and
t is the time.
In one complete period (T), the oscillator starts at the equilibrium position, moves to the maximum displacement (amplitude A), returns to the equilibrium position, and finally moves to the opposite maximum displacement (-A) before returning to the equilibrium position again.
Therefore, the total distance traveled by the oscillator in one complete period is twice the amplitude (2A).
Given that the amplitude (a) is provided, and we want to find the distance traveled in 9.5 periods, we can calculate it as follows:
Distance traveled in 9.5 periods = 9.5 * 2 * amplitude (a)
Distance traveled in 9.5 periods = 19 * a
Therefore, the distance traveled by the oscillator in 9.5 periods is 19 times the amplitude (a).
A capacitor with a capacitance of 773 μF is placed in series with a 10 V battery and an unknown resistor. The capacitor begins with no charge, but 30 seconds after being connected, reaches a voltage of 6.3 V. What is the time constant of this RC circuit?
The time constant of the RC circuit is approximately 42.1 seconds.
An RC circuit involves a resistor and a capacitor in series. The time constant of the circuit (denoted τ) is defined as the time required for the capacitor to charge to 63.2% of its maximum voltage (or discharge to 36.8% of its initial voltage).
To find the time constant (τ) of the RC circuit, use the following equation:τ = RC, where R is the resistance of the unknown resistor and C is the capacitance of the capacitor. The voltage across the capacitor, V(t), at any given time t can be found using the following equation:
V(t) = V(0)(1 - e^(-t/τ)). where V(0) is the initial voltage across the capacitor and e is Euler's number (approximately 2.71828).
We are given that the capacitance of the capacitor is C = 773 μF and the voltage across the capacitor after 30 seconds is V(30) = 6.3 V.
The initial voltage across the capacitor, V(0), is zero because it begins with no charge. The voltage of the battery is 10 V. Using these values, we can solve for the resistance and time constant of the RC circuit as follows:
V(t) = V(0)(1 - e^(-t/τ))6.3 = 10(1 - e^(-30/τ))e^(-30/τ) = 0.37-30/τ = ln(0.37)τ = -30/ln(0.37)τ ≈ 42.1 seconds
The time constant of the RC circuit is approximately 42.1 seconds.
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(a) Calculate the classical momentum of a electron traveling at 0.972c, neglecting relativistic effects. (Use 9.11 x 10⁻³¹ for the mass of the electron.) _________________ kg⋅m/s (b) Repeat the calculation while including relativistic effects. kg⋅m/s (c) Does it make sense to neglect relativity at such speeds? O yes O no
A. The classical momentum of the electron traveling at 0.972c is 2.66×10⁻²² Kg.m/s
B. The momentum of the electron while including relativistic effects is 1.13×10⁻²¹ Kg.m/s
C. No, it does not make sense to neglect relativity at such speed.
A. How do i determine the momentum?The classical momentum of the electron traveling at 0.972c can be obtained as follow:
Mass of electron = 9.11×10⁻³¹ KgSpeed of light in space (c) = 3×10⁸ m/s Velocity of electron = 0.972c = 0.972 × 3×10⁸ = 2.916×10⁸ m/sClassical momentum =?Classical momentum = mass × velocity
= 9.11×10⁻³¹ × 2.916×10⁸
= 2.66×10⁻²² Kg.m/s
B. How do i determine the momentum while considering relativistic effect?The momentum of the electron while including relativistic effect can be obtained as follow:
Classical momentum (p) = 2.66×10⁻²² Kg.m/sSpeed of light in space (c) = 3×10⁸ m/s Velocity of electron (v) = 0.972c Relativity momentum (P) =?[tex]P = \frac{p}{\sqrt{1 -(\frac{v}{c})^{2}}} \\\\\\= \frac{2.66*10^{-22}}{\sqrt{1 -(\frac{0.972c}{c})^{2}}} \\\\\\= 1.13*10^{-21}\ kg.m/s[/tex]
Now, considering the the value of the classical momentum (i.e 2.66×10⁻²² Kg.m/s) and the relativity momentum (1.13×10⁻²¹ Kg.m/s) we can see a that there is a great different in the momentum obtained in both instance.
Therefore, we can say that it does not make sense to neglect relativity at such speed.
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Intelligent beings in a distant galaxy send a signal to earth in the form of an electromagnetic wave. The frequency of the signal observed on earth is 1.6% greater than the frequency emitted by the source in the distant galaxy. What is the speed vrel of of galaxy relative to the earth? Vrel = Number ________________ Units ____________
The speed vrel of the galaxy relative to the Earth is 4.8 x 10^6 m/s
Number = 4.8 x 10^6; Units = m/s.
In order to calculate the speed vrel of the galaxy relative to the Earth, we can use the formula:
vrel/c = Δf/f
where
c is the speed of light,
Δf is the change in frequency, and
f is the frequency emitted by the source in the distant galaxy.
So, first we need to calculate the value of Δf.
We know that the frequency observed on Earth is 1.6% greater than the frequency emitted by the source in the distant galaxy.
Mathematically, we can express this as:
Δf = (1.6/100) x f
where f is the frequency emitted by the source in the distant galaxy.
Substituting this value of Δf in the above formula, we get:
vrel/c = Δf/f
= (1.6/100) x f / f
= 1.6/100
vrel/c = 0.016
vrel = c x 0.016
vrel = 3 x 10^8 m/s x 0.016
= 4.8 x 10^6 m/s
Hence, the speed vrel of the galaxy relative to the Earth is 4.8 x 10^6 m/s (meters per second).
Number = 4.8 x 10^6; Units = m/s.
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A cylinder, made of polished iron, is heated to a temperature of 700 °C. At this temperature, the iron cylinder glows red as it emits power through thermal radiation. The cylinder has a length of 20 cm and a radius of 4 cm. The polished iron has an emissivity of 0.3. Calculate the power emitted by the iron cylinder through thermal radiation.
The power emitted by the iron cylinder through thermal radiation is 198.04 W.
The power emitted by the iron cylinder through thermal radiation is 198.04 W. This is calculated as follows: Given: Length (l) of cylinder = 20 cm Radius (r) of cylinder = 4 cm Temperature (T) of cylinder = 700 °CE missivity (ε) of polished iron = 0.3Power emitted (P) = ?The power emitted by an object through thermal radiation can be calculated using the Stefan-Boltzmann law, which states that: P = εσAT⁴Where:P = power emittedε = emissivity of the objectσ = Stefan-Boltzmann constant = 5.67 x 10⁻⁸ W/(m²K⁴)A = surface area of the object T = temperature of the object. In this case, we need to convert the given dimensions to SI units: Length (l) of cylinder = 20 cm = 0.2 m Radius (r) of cylinder = 4 cm = 0.04 m Surface area (A) of cylinder = 2πrl + 2πr²= 2π(0.04)(0.2) + 2π(0.04)²= 0.0502 m²Now, we can substitute the given values into the formula and solve for P:P = 0.3 x (5.67 x 10⁻⁸) x 0.0502 x (700 + 273)⁴= 198.04 W. Therefore, the power emitted by the iron cylinder through thermal radiation is 198.04 W.
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Two horizontal forces, P and Q, are acting on a block that is placed on a table. We know that P is directed to the left but the direction of Q is unknown; it could either be directed to the right or to the left. The object moves along the x-axis. Assume there is no friction between the object and the table. Here P = −8.8 N and the mass of the block is 3.6 kg.
(a)
What is the magnitude and direction of Q (in N) when the block moves with constant velocity? (Indicate the direction with the sign of your answer.)
_________N
(b)
What is the magnitude and direction of Q (in N) when the acceleration of the block is +4.0 m/s2. (Indicate the direction with the sign of your answer.)
_________N
(c)
Find the magnitude and direction of Q (in N) when the acceleration of the block is −4.0 m/s2. (Indicate the direction with the sign of your answer.)
____________N
a) The block is moving at a constant velocity. Therefore, the net force acting on the block should be equal to zero.
Fnet = P + Q = 0Q = − P = − (− 8.8 N) = 8.8 N
Therefore, the magnitude and direction of Q when the block moves with a constant velocity are 8.8 N to the right. This can be seen in the diagram below:
Therefore, the answer is 8.8 N to the right.
b) The acceleration of the block is 4.0 m/s² and the net force acting on the block is
Fnet = m a
where m is the mass of the block. We can use the following equation to find the magnitude of Q.
Fnet = P + Q = m a
Q = m a − PP
= − 8.8 Nm
= 3.6 kg
Q = (3.6 kg) (4.0 m/s²) − (− 8.8 N)
Q = 14.4 N + 8.8 N
Q = 23.2 N
Therefore, the magnitude and direction of Q when the acceleration of the block is +4.0 m/s² is 23.2 N to the right.
Therefore, the answer is 23.2 N to the right.
c) The acceleration of the block is −4.0 m/s² and the net force acting on the block is
Fnet = m a, where m is the mass of the block. We can use the following equation to find the magnitude of Q
.Fnet = P + Q = m a
Q = m a − PP =
− 8.8 Nm = 3.6 kg
Q = (3.6 kg) (−4.0 m/s²) − (− 8.8 N)
Q = − 14.4 N + 8.8 N
Q = − 5.6 N
Therefore, the magnitude and direction of Q when the acceleration of the block is −4.0 m/s² is 5.6 N to the left.
Therefore, the answer is 5.6 N to the left.
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A cyclist is riding up a hill having a constant slope of 30° with respect to the home screen speed (in a straight line). Which statement is true? a. The net force on the bike (due to gravity, the normal force, and friction) is zero b. The net force on the bike (due to gravity, the normal force, and friction) is in the direction of mechan. c. The net force on the bike (due to gravity, the normal force, and friction) is in the opposite direction of motion. d. None of these statements are true. b. The truck will not have trened. d. The truck will have travelled farther P2: A 2.0-kg box is pushed up along a frictionless incline with a force F as shown in figure below. HE the magnitude of F is 19.6 N, what is the magnitude of acceleration of the box? Include the free baby diagram and other important physics to earn full credits. a. Zero b. 1.15 m/s2 c.4.6 m/s2 d.5.20 m/s f. none of the above a e.98 m 3 28
Therefore, the magnitude of the acceleration of the box is 0.01 m/s^2.The correct option is none of the above a.
A cyclist is travelling up a hill with a constant slope of 30 degrees relative to the home screen's speed. The statement, "The net force on the bike is in the opposite direction of motion," is true. It is caused by friction, gravity, and the normal force. The gravitational force acting on the bike while a cyclist is moving up a hill with a constant slope of 30° with respect to home screen speed (in a straight line) can be separated into two parts: a component parallel to the hill and one perpendicular to it. The bike accelerates down the hill due to the parallel component, while the perpendicular component generates a normal force to support the weight of the bike. Also there is a frictional force that pushes against the bike's motion in the opposite direction. Gravitational force applies in the opposite direction from the bike's direction of motion when the cyclist is riding uphill. Gravity, the normal force, and friction all contribute to the bike's net force, which is acting in the opposite direction of speed. The right answer is c. The net force on the bike (due to gravity, the normal force, and friction) is in the opposite direction of motion.P2: A 2.0-kg box is pushed up along a frictionless incline with a force F as shown in figure below. The magnitude of F is 19.6 N, what is the magnitude of acceleration of the box?The free body diagram of the 2.0-kg box is as shown below:free body diagram of 2.0-kg box on incline planeHere, N is the normal force on the box and m is the mass of the box.The gravitational force, Fg is given by:Fg = m * g, where g is the acceleration due to gravitySince the box is on a frictionless incline plane, there is no frictional force acting on it.Therefore, the net force on the box is given by:Fnet = Fa - Fg, where Fa is the force applied on the box.The magnitude of the force applied is given as Fa = 19.6 N.The gravitational force acting on the box is given by Fg = m * g, where g is the acceleration due to gravity and is approximately 9.81 m/s^2.The magnitude of the gravitational force acting on the box is Fg = 2.0 kg * 9.81 m/s^2 = 19.62 N.Therefore, the net force acting on the box is:Fnet = Fa - Fg = 19.6 N - 19.62 N = -0.02 NSince the net force acting on the box is negative, the box is decelerating.The magnitude of the acceleration of the box is given by:Fnet = m * a, where a is the acceleration of the box.Therefore, the magnitude of the acceleration of the box is:a = Fnet / m = -0.02 N / 2.0 kg = -0.01 m/s^2. Therefore, the magnitude of the acceleration of the box is 0.01 m/s^2.The correct option is none of the above a.
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Lynn Loca drives her 2500 kg BMW car on a balmy summer day. She initially is moving East at 144 km/h. She releases the gas pedal and applies the brakes for exactly 4 seconds, decelerating her car to a slower velocity Eastwards. The coefficient of friction is 0.97 and the average drag force during the deceleration is 1 235 N [West]. Determine the final velocity of the car.
Lynn Loca drives her 2500 kg BMW car on a balmy summer day the final velocity of Lynn's car, after applying the brakes for 4 seconds, is approximately 38.024 m/s in the Westward direction.
To determine the final velocity of Lynn's car, we can use the equations of motion.
Given
Mass of the car (m) = 2500 kg
Initial velocity (u) = 144 km/h = 40 m/s (East)
Deceleration time (t) = 4 s
Coefficient of friction (μ) = 0.97
Average drag force (F) = 1235 N (West)
First, we need to calculate the deceleration (a) experienced by the car. The drag force can be written as F = m * a.
1235 N = 2500 kg * a
a = 0.494 m/s^2 (West)
Next, we can use the equation of motion v = u + at, where v is the final velocity.
v = 40 m/s + (-0.494 m/s^2) * 4 s
v = 40 m/s - 1.976 m/s
v ≈ 38.024 m/s
The negative sign indicates that the final velocity is in the opposite direction to the initial velocity, i.e., Westwards.
Therefore, the final velocity of Lynn's car, after applying the brakes for 4 seconds, is approximately 38.024 m/s in the Westward direction. The car slows down from an initial velocity of 40 m/s to this final velocity due to the deceleration force provided by the brakes and the drag force acting against the car's motion.
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Heidi is floating in a raft in a lake. She estimates that waves are hitting the shore once every 14.0 seconds. The wave crests appear to be 18.0 meters apart. What is the speed of these waves? 3.5 m/s O 0.78 m/s O 1.3 m/s O252 m/s
The speed of the waves is approximately 1.29 m/s.
The speed of waves can be calculated using the formula:
Speed = Wavelength / Time
Given:
Time between wave crests = 14.0 seconds
Wavelength (distance between wave crests) = 18.0 meters
Substituting the given values into the formula:
Speed = 18.0 meters / 14.0 seconds
After performing the calculation, the result is approximately 1.29 m/s.
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300 g of water is brought to boiling temperature. The water is then left to cool to room temperature (25°C). The specific heat heat capacity is 4200 J/kg°C. How much energy is released by thermal energy store associated with the water cools. Show working
Answer:
94.5kJ
Explanation:
To calculate the energy released by the thermal energy store associated with the water cooling, we can use the following formula:
Q = mcΔT
where Q is the energy released, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.
We first need to calculate the temperature change of the water. The initial temperature of the water is the boiling point of 100°C, and the final temperature is the room temperature of 25°C. Therefore, the temperature change is:
ΔT = (25°C - 100°C) = -75°C
Note that the temperature change is negative because the water is cooling down.
Next, we can substitute the given values into the formula and solve for Q:
Q = (0.3 kg) x (4200 J/kg°C) x (-75°C)
Q = -94500 J
The negative sign indicates that energy is released by the thermal energy store associated with the water cooling. Therefore, the energy released is 94,500 J, or approximately 94.5 kJ.
calculate the energy required to convert 0.5kg of ice to liquid water. the specific latent heat of fusion of water is 334000j/kg
Propose a two-dimensional, transient velocity field and find the general equations for the
trajectory, for the current line and for the emission line (no need to plot the graphs,
display only the equations). Find the streamlined equation of this flow that
passes point (2; 1) at time t = 1 s. Find the equation of the trajectory of a fluid particle
passing through this same point at time t = 2 s.
The equation of the trajectory passing through point (2, 1) at time t = 2 s is:
x = 10 + C₁
y = 10 + C₂
To propose a two-dimensional, transient velocity field, let's consider the following velocity components:
u(x, y, t) = x² - 2y + 3t
v(x, y, t) = 2x - y² + 2t
These velocity components represent a time-varying velocity field in the x and y directions.
The trajectory of a fluid particle can be found by integrating the following equations:
dx/dt = u(x, y, t)
dy/dt = v(x, y, t)
To find the equation for the current line, we need to solve the equation:
dy/dx = (dy/dt) / (dx/dt)
Substituting the given velocity components:
dy/dx = (2x - y² + 2t) / (x² - 2y + 3t)
Similarly, to find the equation for the emission line, we solve the equation:
dy/dx = (dy/dt) / (dx/dt)
Substituting the given velocity components:
dy/dx = (-x² + 2y - 3t) / (2x - y² + 2t)
To find the streamlined equation of this flow passing through the point (2, 1) at time t = 1 s, we substitute the values into the equation:
dx/dt = u(x, y, t)
dy/dt = v(x, y, t)
dx/dt = 2² - 2(1) + 3(1) = 4 - 2 + 3 = 5
dy/dt = 2(2) - 1² + 2(1) = 4 - 1 + 2 = 5
Now we have the initial velocities at the point (2, 1) and we can integrate to find the equations for the trajectory:
∫ dx = ∫ 5 dt
∫ dy = ∫ 5 dt
Integrating both sides with respect to their respective variables:
x = 5t + C₁
y = 5t + C₂
Where C₁ and C₂ are integration constants.
Therefore, the equation of the trajectory passing through point (2, 1) at time t = 1 s is:
x = 5t + C₁
y = 5t + C₂
To find the equation of the trajectory passing through the same point (2, 1) at time t = 2 s, we substitute the values into the equation:
x = 5(2) + C1 = 10 + C₁
y = 5(2) + C₂ = 10 + C₂
Therefore, the equation of the trajectory passing through point (2, 1) at time t = 2 s is:
x = 10 + C₁
y = 10 + C₂
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