1. The problem statement, all variables and given/known data 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? 2. Relevant equations v = sqrt(G*m / r) 3. 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.