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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A thin circular ring of mass and radius is rotating about its axis with a constant angular velocity . Two objects each of mass are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity equal to

Answer: (D)

Solution

Angular momentum is conserved: mR² ω = (m + 2M)R² ω', so ω' = m ω/(m + 2M). (a) is larger than ω (impossible

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Question ID VK-040759