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MHT CET 2025 Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET 2025

A man standing on a turn-table is rotating at a certain angular frequency with his arms outstretched. He suddenly folds his arms. If his moment of inertia with folded arms is 75% of that with outstretched arms, this his rotational kinetic energy will

Answer: (A)

Solution

There is no external torque, so angular momentum is conserved: with , giving . Kinetic energy , so . The kinetic

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Question ID VK-102953