A satellite moves in a circular orbit around the Earth at a speed of 6.1 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 10^24 kg. The value of the universal gravitational constant is 6.67259 × 10^?11 N · m^2/kg^2. Answer in units of km