The acceleration due to gravity at the poles is 10ms-2 and equatorial radius is 6400km for the earth. Then the angular velocity of rotation of the earth about its axis so that the weight of a body at the equator reduces to 75% is
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The acceleration due to gravity at the poles is 10ms-2 and equatorial radius is 6400km for the earth. Then the angular velocity of rotation of the earth about its axis so that the weight of a body at the equator reduces to 75% is