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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A uniform disc of radius 'a' and mass 'm' is rotating freely with angular speed '' in a horizontal plane about a smooth fixed vertical axis through its centre. A particle of mass 'm' is then suddenly attached to the rim of the disc and rotates with it. The new angular speed is

Answer: (B)

Solution

, ; conservation of angular momentum gives

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Question ID VK-040530