Question 1

If you know the impulse that has acted on a body of mass m you can calculate

Accepted Answer

A)   its initial velocity.
B)   its final velocity.
C)   its final momentum.
D)   the change in its velocity.
E)   its acceleration during the impulse.F) B) and D)
G) C) and D)

Question 2

In an elastic collision between two bodies of mass m1 and m2, with m2 initially at rest, mass 1 moves off at angle θ relative to the direction of its initial velocity and mass 2 at angle φ. An exam paper shows the equations below: m1v1i
0
= m1v1f cosθ + m2v2f sinφ
= m1v1f sinθ + m2v2f cosφ
What error(s)  has the student made?

Accepted Answer

A)   In the first equation, m2v2f sinφ should be m2v2f cosφ.
B)   In the second equation, m2v2f cosφ should be m2v2f sinφ.
C)   In the second equation, the plus sign between the terms on the right should be a minus sign.
D)   All of the errors listed above.
E)   Only errors (a)  and (b)  above.F) A) and E)
G) B) and E)

Question 3

Two boys in a canoe toss a baseball back and forth. What effect will this have on the canoe? Neglect (velocity-dependent)  frictional forces with water or air.

Accepted Answer

A)   None, because the ball remains in the canoe.
B)   The canoe will drift in the direction of the boy who throws the ball harder each time.
C)   The canoe will drift in the direction of the boy who throws the ball with less force each time.
D)   The canoe will oscillate back and forth always moving opposite to the ball.
E)   The canoe will oscillate in the direction of the ball because the canoe and ball exert forces in opposite directions upon the person throwing the ball.F) None of the above
G) A) and E)

Question 4

A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is

Accepted Answer

A)   2.7 N s, up.
B)   2.7 N s, down.
C)   7.3 N s, up.
D)   7.3 N s, down.
E)   9.6 N s, up.F) B) and E)
G) C) and D)

Question 5

A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision.

Accepted Answer

A)   15 m/s
B)   7.0 m/s
C)   8.0 m/s
D)   23 m/s
E)   11 m/sF) C) and D)
G) A) and C)

Question 6

A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?

Accepted Answer

A)   2.0 m/s
B)   2.7 m/s
C)   4.9 m/s
D)   2.4 m/s
E)   3.6 m/sF) A) and B)
G) All of the above

Question 7

A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is

Accepted Answer

A)   9.80 N s.
B)   19.6 N s.
C)   29.4 N s.
D)   58.8 N s.
E)   118 N s.F) None of the above
G) B) and D)

Question 8

At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?

Accepted Answer

A)   16 m/s
B)   45 m/s
C)   23 m/s
D)   20 m/s
E)   36 m/sF) None of the above
G) A) and E)

Question 9

A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1500 m/s. A baseball has a mass of 0.145 kg. What must be its speed if the pitcher's claim is valid?

Accepted Answer

The answer of A pitcher claims he can throw a...

Exam 9: Linear Momentum and Collisions

A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision.

Correct Answer
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Correct Answer
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A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is

Correct Answer
verified

Correct Answer
verified

At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?

Correct Answer
verified

If you know the impulse that has acted on a body of mass m you can calculate

Correct Answer
verified

A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is

Correct Answer
verified

A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1500 m/s. A baseball has a mass of 0.145 kg. What must be its speed if the pitcher's claim is valid?

Correct Answer
verified

Two boys in a canoe toss a baseball back and forth. What effect will this have on the canoe? Neglect (velocity-dependent) frictional forces with water or air.

Correct Answer
verified

Exam 9: Linear Momentum and Collisions

A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A 0.28-kg stone you throw rises 34.3 m in the air. The impulse the stone receives from your hand while being thrown is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?

Correct AnswerverifiedShow Answer

If you know the impulse that has acted on a body of mass m you can calculate

Correct AnswerverifiedShow Answer

A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is

Correct AnswerverifiedShow Answer

A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1500 m/s. A baseball has a mass of 0.145 kg. What must be its speed if the pitcher's claim is valid?

Correct AnswerverifiedShow Answer

Two boys in a canoe toss a baseball back and forth. What effect will this have on the canoe? Neglect (velocity-dependent) frictional forces with water or air.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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