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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A uniform rod AB of mass and length at rest on a smooth horizontal surface. An impulse is applied to the end B. The time taken by the rod to turn through a right angle is

Answer: (C)

Solution

Angular impulse about the centre: P(l/2) = (ml²/12)ω gives ω = 6P/(ml) (constant); time for π/2 rad is t = (π/2)/ω = π

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Question ID VK-040764