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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 co-axially on a rotating disc. Now, both the discs are rotating with constant angular speed . The energy lost by the initial rotating disc is [MHTCET 2017]

Answer: (D)

Solution

Angular momentum conservation gives , so the energy lost

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Question ID VK-040795