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Communication satellites are often placed in geosynchronousorbits, which means that the satellite always appears in the samelocation relative to a receiver on the ground. This requires amongother things that the rotational speed at which the satelliteorbits the planet is the same as the rotational speed at which theplanet spins on its axis. Consider a planet with mass = 4.32 × 1024kg and radius = 5.43 × 106 m and rotational period 25.0 hours.
