1. The problem statement, all variables and given/known data A 20 kg satellite has a circular orbit with a period 2.4 h and radius 8.0×106m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 8.0 m/s2, what is the radius of the planet? 2. Relevant equations F = Gm1m2/r2 Fc = m1v2/r v=D/T, D=[itex]\pi[/itex]r 3. The attempt at a solution So I got the velocity of the the satellite by using speed=distance/time where the distance is the circumference of the orbit or [itex]\pi[/itex]r and T is the period in seconds. I'm having trouble because there is an unknown mass of the planet and its radius. How do I go about finding this values? Any help is much appreciated.