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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

If the earth suddenly contracts to of its present size without change in its mass, the ratio of kinetic energy of the earth after and before contraction will be (Earth is assumed to be a sphere) [MHT-CET 2022, MHT-CET 2022]

Answer: (B)

Solution

Angular momentum is conserved, so ; with the radius

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Question ID VK-040908