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  4. A man standing on a revolving platform spreading his hands suddenly he stretches his hand. Then:

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Q. A man standing on a revolving platform spreading his hands suddenly he stretches his hand. Then:

Rajasthan PMTRajasthan PMT 1998

Solution:

Angular momentum $ J=I\omega $ On stretching the arms, moment of inertia will decrease, so to conserved angular momentum, angular velocity will increase.