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The acceleration due to gravity at the p...

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

A

`1/1600 rads^(-1)`

B

`1/800 rads^(-1)`

C

`1/400 rads^(-1)`

D

`1/200 rads^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`g_(phi)=g-Romega^(2)`, given `g_(phi)=75/100g`
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