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MHT CET 2022 Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET 2022

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 s. If the torque is due to a force applied tangentially on the rim of the disc, then the magnitude of the force in newton is

Answer: (D)

Solution

Initial angular speed rad/s, final in s, so rad/s (retardation). Moment of inertia of the disc about its axis:

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Question ID VK-094251