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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A dancer is standing on a stool, rotating about the vertical axis passing through its centre. She pulls her arms towards her body, reducing her moment of inertia by a factor of . The new angular speed of the turn table is proportional to

Answer: (A)

Solution

. By conservation of angular momentum, $ω_1=ω_2

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Question ID VK-158520