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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A disc of moment of inertia '' is rotating with angular velocity '' about an axis perpendicular to its plane, passing through its centre. If another disc of moment of inertia '' about the same axis is gently placed over it, then the new angular velocity of the combined disc will be [MHT-CET 2021, MHT-CET 2021]

Answer: (C)

Solution

No external torque, so giving ; (a) would

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Question ID VK-040941