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## Homework Statement

Calculate at what height above the earth's surface a satellite must be placed if it is to remain over the same geographical point on the equator of the earth. What is the velocity of such a satellite?

## Homework Equations

v = sqrt(G*m / r)

## The Attempt at a Solution

At first I thought the velocity of the satellite would have to be the same as the earth, but since r is different the velocity must also be different. I have 2 unknowns for the satellite, the velocity and r, and can't figure out what to do now.

Thanks for your help.