Posted by winterWX on .
A 21.0kg satellite has a circular orbit with a period of 2.37 h and a radius of 8.50×106 m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 7.10 m/s2, what is the radius of the planet?
I am not sure which formula to use to find the mass and then radius of the planet :/
oops, typo haha...nevermind, I found your answer below. thanks!!!

Physics 
Anonymous,
A 20 kg satellite has a circular orbit with a period of 2.9 h and a radius of 9.6 ✕ 106 m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 8.1 m/s2, what is the radius of the planet?