1. A boy and a girl are riding on a merry-go-round which is turning at a constan

Question

1. A boy and a girl are riding on a merry-go-round which is turning at a constant rate. The boy is near the outer edge, and the girl is closer to the center. Who has the greater angular displacement?

A) the boy

B) the girl

C) Both have the same non-zero angular displacement.

D) Both have zero angular displacement.

2. Ignoring air resistance, the horizontal component of a projectile's velocity

A) is zero

B) steadily decreases

C) is constant

D) steadily increases

3. An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his angular momentum about the axis of rotation?

A) It increases

B) It decreases

C) It does not change

D) It might increase or decrease

4. If you pitch a baseball with twice the kinetic energy you gave it in the previous pitch, the magnitude of its momentum is

A) the same.

B) 1.41 times more

C) 4 times more.

D) doubled.

Explanation / Answer

1. C) Both have the same non-zero angular displacement.

2. C) is constant

3. B) It decreases

4. B) 1.41 times more

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