Answers

2014-04-21T16:27:38+05:30
Force between 2 objects = GMm/d^2
Force of objects at surface of earth = GMm/R^2
You know that earth has geoid shape and it is not a complete sphere
The radius of earth is slightly shorter between the centre and surface, so gravity is more at the pole
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2014-04-21T16:36:56+05:30
It is because they feel centrifugal acceleration due to the earth's rotation...
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