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A person is standing on a rotating platf...

A person is standing on a rotating platform, with his arms at his sides. If he stretches his arms, then which of the following statements is correct?

A

Linear momentum is conserved

B

Kinetic energy increases

C

Angular momentum increases

D

Angular velocity increases

Text Solution

Verified by Experts

The correct Answer is:
B, D
Kinetic energy is not conserved in the given process. In fact, with the decrease in the moment of inertia, kinetic energy increases. The additional kinetic energy comes from the work done by the man to fold his hands toward himself. Angular velocity increases as moment of inertia decreases.
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ERRORLESS-ROTATIONAL MOTION-NCERT BASED QUESTIONS (Angular Momentum)
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  2. According to the principle of conservation of angular momentum, if mom...

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  4. When a mass is rotating in a plane about a fixed point, its angular mo...

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  18. A horizontal disk of moment of inertia 4.25 kg-m^(2) with respect to i...

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