15108057
Descripción
Test por Jeffrey Piggott, actualizado hace más de 1 año
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Creado por Jeffrey Piggott
hace alrededor de 6 años
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Pregunta 1
Pregunta
A 10-kg box, initially at rest, moves along a frictionless horizontal surface. A horizontal force to the right is applied to the box. The magnitude of the force changes as a function of time as shown.
Which of the following impulse calculations is correct?
I. The impulse for the period from 0 to 2 seconds is 4 Ns.
II. The impulse for the period from 2 to 5 seconds is 6 Ns.
III. The impulse for the period from 5 to 8 seconds is Ns.
Image:
Q1 (binary/octet-stream)
Respuesta
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I only.
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II only.
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III only.
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I and II.
Pregunta 2
Pregunta
A 10-kg box, initially at rest, moves along a frictionless horizontal surface. A horizontal force to the right is applied to the box. The magnitude of the force changes as a function of time is shown in the top graph.
A student draws the bottom graph for the momentum of this 10-kg box as a function of time during this 10-second interval.
Which statements describe what is correct about the second graph and/or describe changes that could be made to correct the graph? Select two answers.
Image:
Q2 (binary/octet-stream)
Respuesta
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From 0 – 2 seconds, the graph should be curved upward and from 5 – 8 seconds, the graph should be curved downward.
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From 0 – 2 seconds, the graph should be curved downward and from 5 – 8 seconds, the graph should be curved upward.
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The graph is correct between 0 – 2 seconds and 5 – 8 seconds.
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The graph is correct between 2 – 5 seconds and 8 – 10 seconds.
Pregunta 3
Pregunta
A 10-kg box, initially at rest, moves along a frictionless horizontal surface. A horizontal force to the right is applied to the box. The magnitude of the force changes as a function of time as shown.
Rank the impulse (greatest to least) applied to the box by this force during each 2-second interval indicated below:
a. 0 to 2 s
b. 2 to 4 s
c. 4 to 6 s
d. 6 to 8 s
e. 8 to 10 s
Image:
Q1 (binary/octet-stream)
Respuesta
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b > c > d > a > e
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b > c > a > d > e
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b > a > c > d > e
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Each slope is straight so the impulse applied to the box during each of the intervals is zero.
Pregunta 4
Pregunta
A 6 kg sphere collides with a stationary 30 kg sphere on a frictionless and horizontal surface at t = 0 s as shown below.
A plot of the force exerted on the 30 kg sphere by the 6 kg sphere as a function of time is also shown.
What is the impulse applied to the 30 kg sphere?
Image:
Q4 (binary/octet-stream)
Respuesta
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100 kg m/s
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250 kg m/s
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300 kg m/s
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500 kg m/s
Pregunta 5
Pregunta
For the collision shown ahttps://www.goconqr.com/assets/icons/image-plus-md.pngt the left, the impulse on the 6 kg sphere is:
Image:
Q4 (binary/octet-stream)
Respuesta
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the same magnitude, but opposite in direction compared to the impulse on the 30 kg sphere.
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the same magnitude and direction compared to the impulse on the 30 kg sphere.
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five times the magnitude, but opposite in direction compared to the impulse on the 30 kg sphere.
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zero.
Pregunta 6
Pregunta
For the collision shown, what is the speed of the 30 kg sphere immediately after the collision?
Image:
Q4 (binary/octet-stream)
Respuesta
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0 m/s
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10 m/s
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50 m/s
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100 m/s
Pregunta 7
Pregunta
For the collision , how do the magnitudes of change in momentum and change in velocity compare for the two objects?
Respuesta
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The 6 kg object has a greater magnitude of momentum change and a greater magnitude of velocity change.
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The two objects have the same magnitude of momentum change, and the 30 kg object has greater magnitude of velocity change.
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The two objects have the same magnitude of momentum change, and the same magnitude of velocity change.
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The two objects have the same magnitude of momentum change, and the 6 kg object has greater magnitude of velocity change.
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