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JEE Main 2013 Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main 2013

A ring of mass M and radius R is rotating about its axis with angular velocity ω. Two identical bodies each of mass m are now gently attached at the two ends of a diameter of the ring. Because of this, the kinetic energy loss will be :

Answer: (3)

Solution

Angular momentum is conserved: , so . Kinetic energy loss $=

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Question ID VK-104168