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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A child is standing with folded hands at the centre of the platform rotating about its central axis. The kinetic energy of the system is 'K'. The child now stretches his arms so that the moment inertia of the system becomes double. The kinetic energy of the system now is [MHT-CET 2020, MHT-CET 2020]

Answer: (A)

Solution

Angular momentum is conserved, so ; doubling halves the energy to , whereas

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Question ID VK-041004