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NEET 2003 Physics question

PhysicsSystems of Particles and Rotational MotionNEET 2003

A thin circular ring of mass and radius is rotating about its axis with a constant angular velocity . Four objects each of mass , are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be -

Answer: (2)

Solution

There is no external torque about the axis, so angular momentum is conserved. Initially . After the four small masses are placed gently on the rim (no initial angular velocity of their own), the moment of inertia becomes . $ω = (M

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Question ID VK-089137