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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A wheel is rotating freely at an angular speed of 800 rev/min on a shaft whose rotational inertia is negligible. A second wheel initially at rest with twice the rotational inertia of the first is suddenly coupled to the same shaft. The fraction of original kinetic energy lost is

Answer: (A)

Solution

gives ; final KE \tfrac3)^2\tfrac\tfrac$12

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Question ID VK-040513