A satellite is in a ciecular orbit 21000 km above the Earth's surface; it moves on a circular path nder the influence of nothing but the Earth's gravity.
Find the speed of the satellite. The radius of the Earth is 6.37m, and the acceleration of gravity at the satellite's altitude is 0.532655m/s square. Answer in units of km/s.
Find the time it takes to complete one orbit around the Earth. Answer in units of s.