What is the Period of a Satellite at 90km Above the Moon's Surface?

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cougar_21
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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?
 
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wow thanx, i missed that thread XD
 
i had most of it but was forgetting to add the R of the moon to the distance of the sat above the moon >.<.