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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A ring of moment of inertia is rotating with 300 r. p. m. If frequency of rotation is reduced by 120 r. p. m., then the work done is [MHT-CET 2014, MHT-CET 2014]

Answer: (B)

Solution

rpm Hz and rpm Hz, so

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Question ID VK-041090