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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A disc of moment of inertia '' is rotating in horizontal plane about an axis passing through a centre and perpendicular to its plane with constant angular speed ''. Another disc of moment of inertia '' having zero angular speed is placed coaxially on a rotating disc. Now both the discs are rotating with constant angular speed ''. The energy lost by the initial rotating disc is [MHT-CET 2023, MHT-CET 2023]

Answer: (D)

Solution

and the loss

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Question ID VK-040846