Question

An object weighs $10N$ at the north pole of theearth. In a geostationary satellite distance $7R$ from the centre of the earth (of radius $R$), the true weight and the apparent weight are.

• A. $0N,0N$
• B. $0.2N,0N$
• C. $0.2N,9.8N$
• D. $0.2N,0.2N$

Answer 1

The correct option is B $0.2N,0N$

Acceleration due to gravity at a height h from the surface , $g^{\prime }=g[1+\frac{h}{R}{]}^{-2}$

For radius of orbit $=7R⟹h=6R$

$m{g}^{\prime }=mg[1+\frac{6R}{R}{]}^{-2}$

$m{g}^{\prime }=10\times [7{]}^{-2}N$

$⟹W^{\prime }=.2N$

Also apparent weight of an object will bo zero.