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Questions  

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

a
1.25 × 10-3 rad s-1
b
2 rad s-1
c
1 rad s-1
d
0

detailed solution

Correct option is A

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

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