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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A ballet dancer spins about a vertical axis on a turn table at 120 rpm with her arms out stretched. When her arm are folded the inertia about the same axis decreases by 50 %. The new speed of revolutions is :

Answer: (B)

Solution

is conserved, so with we get r.p.m.; 180,

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Question ID VK-040368