First slide
Variation of g
Question

The alttitude at which the weight of a body is only 64% of its weight on the surface of the earth is (Radius of the earth is 6400km)

Easy
Solution

\large {g}'=\frac {g}{\left ( 1+\frac hR \right )^2}
\large 64=\frac {100}{\left ( 1+\frac hR \right )^2}\Rightarrow h=\frac R4=1600km

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