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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A circular disk of moment of inertia is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed . Another disk of moment of inertia is dropped coaxially onto the rotating disk. Initially the second disk has zero angular speed. Eventually both disks rotate with a constant angular speed . The energy lost by the initially rotating disc to friction is

Answer: (A)

Solution

Conservation: . Energy lost

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Question ID VK-159086