1. The problem statement, all variables and given/known data A GPS satellite is put in a high circular orbit around the earth. The period of revolution is 8 hours. Calculate the radius r of the orbit, compared to the radius R of the earth. 2. Relevant equations Rearth= 6.4 x 10^6 m mearth= 6 x 10^24 kg 3. The attempt at a solution I have no idea how to attempt this problem. Can someone please help?