Physica
posted by winterWX .
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!!!

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?
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