Question

A satellite of mass 500 Kg is moving in a radius ‘r’ around Earth; where r = 220 km. Find K.E. of satellite :-

(1) \(4.5 \times 10^{10} \ J\)

(2) \(4.5\times 10^9\ J\)

(3) \(4.5 \times 10^{11} \ J\)

(4) None

Answer 1

Correct option is : (4) None

\(KE = \frac{1}{2} \frac{GM_sM_p}{r}\)

\( =\frac{6.67 \times 10^{-11}\times 500 \times 6 \times 10^{24}}{2\times 200 \times 10^3}\)

\( =50\times 10^{10}\ J \)