A satellite orbits at an average altitude of h = 423 km. How long does it need to complete one full orbit? Use REarth = 6370 km and mEarth = 5.98 x 10^24 kg

Answer 1

force gravity=centipetalfoce
GMm/(r+h)^2= m (v)^2/(r+h)
but v= 2pi (r+h)/T
so solve for T.

Answer 2

what is GMm? is it gravity (9.81) times m of Earth?