Period of a satellite!

[cougar_21]

What is the period of a satellite circling the Moon at a height of 90km above the Moon's surface?

Can someone get me started please?

[Sirus]

This should help you: http://www.physicsforums.com/showthread.php?t=51690&highlight=orbital+period

Instead of the sun, you have the moon.

[cougar_21]

wow thanx, i missed that thread XD

[cougar_21]

i had most of it but was forgetting to add the R of the moon to the distance of the sat above the moon >.<.