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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 a platform rotating about its central axis. The kinetic energy of the system is . The child now stretches his arms, so that the moment of inertia of the system doubles. What is the new kinetic energy of the system?

Answer: (C)

Solution

Angular momentum is conserved so K = L²/(2I); doubling I halves the kinetic energy to K/2 (K and 2K would

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Question ID VK-040766