The angular velocity of the earth about its polar axis so that the weight of the body at the equator will be zero is

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1.25 × 10-3 rad s-1

2 rad s-1

1 rad s-1

answer is A.

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Detailed Solution

Now g = 10 m/s2 and R = 6400 km = 64 x 105 m/s2 ω = 1.25 x 10-3 rad/sec