Hi everyone! I have some trouble with the following problem. Can anyone give me a hint? This is the problem: A sattelite is to be located always above the same point on Earth. What is the radius of its orbit and how is the plane of the orbit inclined wrt the North-South axis of Earth? my attempt: 1) find angular velocity w of the earth (one rotation per day) and this must be the same for the sattelite now, [tex] T^2=(2*pi*r / v)^2 [/tex] where v = w * R(earth) HOWEVER: only m(earth) and not R(earth) is given in the question. Therefore I do not "officially" know R(earth) 2) I have no idea how to do this one. I have been thinking this through several times already, but I do not see to which known quantity the angle could be related If anyone would be able to give me a hint (or two ), that would be amazing! Thanks so much!