Special Relativity states that a clock orbiting Earth will tick slower than one on the surface of Earth. General Relativity states the opposite - a clock will tick faster the further it is from a mass. Is there then a critical radius where these two effects cancel out? Ignore the rotation of Earth for this problem. State the radius in terms of rc=krE, where k is the number to be determined and where rE is the radius of the Earth. -This was the extra credit problem on my Relativity final which I really wish I could have solved. Anybody want to take a shot at it?