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Derive the expression of variation of g with altitude. |
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Answer» f GRAVITY acting on a body of mass m on the earth surface = F = GMm/R^2 ____________ (1)Where R is the radius of the earth (considering it a homogenous sphere)and M here is the total mass of earth concentrated at its centre. G is the gravitational constant.Now, from Newton’s 2ND Law of Motion,F = mg.___________________(2)Just to recapitulate, as a body falls downwards it is continuously ACTED upon by a force of gravity. The body thus possesses an acceleration, called Acceleration Due to gravity(g). |
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