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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

An uniform rod AB of mass 'm' and length 'l' is at rest on a smooth horizontal surface. An impulse 'P' is applied to the end B. The time taken by the rod to turn through a right angle is [MHT-CET 2019, MHT-CET 2019]

Answer: (A)

Solution

The angular impulse about the centre is , so (constant, no torque afterwards); time for rad is

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Question ID VK-041067