1) An ice skater starts a spin with her arms stretched out to the sides. She bal

Question

1) An ice skater starts a spin with her arms stretched out to the sides. She balances on the tip of one skate to turn without friction. She then pulls her arms in so that her moment of inertia decreases by a factor of two. In the process of her doing so, what happens to her angular momentum

a) It increases by a factor of four

b) It increases by a factor of two

c) It remains constant

d) It decreases by a factor of two

e) It decreases by a factor of four

2) An ice skater starts a spin with her arms stretched out to the sides. She balances on the tip of one skate to turn without friction. She then pulls her arms in so that her moment of inertia decreases by a factor of two. In the process of her doing so, what happens to her angular (rotational) speed?

a) It increases by a factor of four

b) It increases by a factor of two

c) It remains constant

d) It decreases by a factor of two

e) It decreases by a factor of four

3) An ice skater starts a spin with her arms stretched out to the sides. She balances on the tip of one skate to turn without friction. She then pulls her arms in so that her moment of inertia decreases by a factor of two. In the process of her doing so, what happens to her rotational kinetic energy?

a) It increases by a factor of four

b) It increases by a factor of two

c) It remains constant

d) It decreases by a factor of two

e) It decreases by a factor of four

Explanation / Answer

1) c) It remains constant
2) b) It increases by a factor of two
3) b) It increases by a factor of two

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