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Determine the speed with which the earth...

Determine the speed with which the earth has to rotate on its axis so that a person on the equator would weigh (3/5)th as much as present take the equatorial radius as 6400km.

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What will be the velocity of rotation of earth about its own axis so that a body becomes weightless at the equator?

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What will be the angular velocity of the diurnal motion of the earth, so that the weight of a body at the equatorial region is 0.6 of the present weight? Radius of the earth = 6400 km.

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