14: All TV satellites must be placed into geostationary orbit in order to remain stationary versus Earth ( why ? ) . Knowing that the elevation of this orbit is about 34,000 km above Earth's surface , how much is the speed of a TV satellite ? How much is the centripetal acceleration of the satellite ? How much must be the acceleration of gravity of Earth at that altitude ? Assume Earth's radius to be 6, 400km! Is there only one geostationary orbit , or there are many of them around Earth ? Explain , why