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MHT CET Physics question

PhysicsGravitationMHT CET

The speed with which the earth would have to rotate about its axis so that a person on the equator would weigh th as much as at present is (g = gravitational acceleration, R = equatorial radius of the earth) [MHT-CET 2019]

Answer: (C)

Solution

Apparent weight gives , so

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Question ID VK-060411