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NEET 2002 Physics question

PhysicsSystems of Particles and Rotational MotionNEET 2002

A disc is rotating with angular speed . If a child sits on it, what is conserved :

Answer: (2)

Solution

When the child sits on the rotating disc, the forces between child and disc are internal and there is no external torque about the axis of rotation, so angular momentum is conserved: . Since increases,

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Question ID VK-088941