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The period of revolution of a satellite is 90min. What is the altitude above the surface of the earth?
14 years ago

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drwls
Quite low altitude. The period would be 84 minutes if it could be in a sea-level orbit.

The earth's radius is Re = 6378 km

Centripetal force must equal gravity attraction

V^2/R = G*M/R^2

V = 2 pi R/(period)

Eliminate V and solve for R. G is the universal gravity constant.

The altitude is R - Re.
14 years ago

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