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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A disc of mass 25 kg and radius 0.2 m is rotating at 240 r. p. m. A retarding torque bring 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 [MHT-CET 2019, MHT-CET 2019]

Answer: (A)

Solution

rad/s so rad/s²,

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Question ID VK-041057