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7.Gravitation
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A body weight $500 \,N$ on the surface of the earth. How much would it weigh half way below the surface of the earth ....... $N$
A
$125$
B
$250$
C
$500$
D
$1000$
Solution
(b) Weight on surface of earth, $mg = 500\,N$ and weight below the surface of earth at $d = \frac{R}{2}$
$mg' = mg\left( {1 – \frac{d}{R}} \right) = mg\left( {1 – \frac{1}{2}} \right) = \frac{{mg}}{2} = 250\,N$
Standard 11
Physics
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