MHT CET 2025 Physics question
A disc of mass 25 kg and radius 0.2 m is rotating at 240 r.p.m. A retarding torque brings it to rest in 20 second. If the torque is due to a force applied tangentially on the rim of the disc then the magnitude of the force is
Answer: (C)
Solution
Initial angular speed rad/s, and the final angular speed is 0 after s, so the retardation is rad/s. Moment of inertia of the disc about its axis: kg m. The torque
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