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

Question

A man standing on a revolving platform spreading his hands suddenly he stretches his hand. Then: (A) angular velocity increase (B) angular velocity decrease (C) angular momentum increase (D) angular moment is zero

Tardigrade Admin · Accepted Answer

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

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

angular velocity increase

angular velocity decrease

angular momentum increase

angular moment is zero

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