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q. a) calculate the orbital radius of a synchronous satellite (one period of 24hr, so appears stationary above any one point). Approximately how many radii of Earth is this orbital radius? Why does the satellite have to be in the plane of the Equator?

b) draw a scale diagram to estimate the angle above the horizontal that a receiving aerial in latitude 45 deg must point in order to receive signals from the satellite.

For a) I figured that I could use the eqn a = (v^2)/r for circular motion substituting v = 2rPi / (24x60x60) ... but this gives r as 1853078.528km :uhh: I think... which would be wrong. I dunno wot to do.

thanks for any help