i) Illustrate that when a satellite orbits close to the surface of a planet having period T, the density (mass/volume) of the planet is p = M/V = (3*pi)/(G(T^2))
ii) Approximate the density of Earth, given that the satellite close to the surface orbits having a period of around 85 min.
iii) Compute the speed of the satellite in near-Earth orbit. (Use radius of the Earth R = 6400km.)