Question

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth?

Answer 1

The radius of the circular orbit, r = 42250 km

Time taken to revolve around the earth, t = 24 h

Speed of an object moving in a circular path is given by, $v=\frac{2\pi r}{t}$

$=\frac{2\times 3.14\times 42250}{24}=1.105\times {10}^{4}km/h=3.069m/s$

Hence, the speed of the artificial satellite is 3.069 km/s.