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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A ring and a disc of different masses are rotating with the same kinetic energy. If we apply a retarding torque on the ring, it stops after making n revolutions. After how many revolutions will the disc stop, if the retarding torque of it is also ?

Answer: (B)

Solution

Work done by the torque initial K.E.; K.E. and are the same for both, so the angle

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Question ID VK-040250