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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A pulley of radius 2 m is rotating about its axis by a force N (where is in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg·m², the number of rotations made by the pulley before its direction of motion is reversed, is

Answer: (A)

Solution

, . ; (motion reverses) when s.

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Question ID VK-158479