NEET UG PHYSICS MCQ: SYSTEM OF PARTICLES

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A dancer spins about a vertical axis at 60 rpm with her arms folded. If she stretches her hands so that M.I about the vertical axes increases by 25% the new rate of revolution is

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Correct option: A

48 rpm

Option A (48 rpm) is correct because it is calculated using the conservation of angular momentum,

I_1 \omega_1 = I_2 \omega_2

, where

I_2 = 1.25 I_1

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