题目内容

After the diver leaves the springboard, he curls his arms and legs as much as he can in the air so that()

A. he can reduce the moment of inertia and angular velocity;
B. he can reduce the moment of inertia and increase the angular velocity;
C. he moment of inertia is increased and the angular velocity is reduced.
D. the moment of inertia is increased and the angular velocity is increased.

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If the moment of inertia of two objects is equal and the ratio of their angular velocities is 3:1, then the ratio of rotational kinetic energy is: ()

A. 9:1
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