Physics Mass of a Sattelite?

Steve

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Okay I need help desperately... I cant solve this physics question

The russian space station, MIR, orbits the earth at an altitude of 390000m above the earth and completes one orbit ever 92 minutes. Its velocity is 31980.20221m/s.

r = 390000m
t = 5520s
m(earth) = 5.98x10^24kg
m(space station) = ?

Can someone please help!
 
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