Gravitational EX.LQ. Show that the weight of a 2.0 kg mass on Earth is about 20 N. Take G = 6.67 x 10-1! N m kg-2 and M. = 5.98 x 1024 kg. Given that the Earth's radius is 6400 km and the gravity on the Earth's surface is 9.8 m s 2. Estimate the period of an artificial Earth-orbiting satellite that passes just above the Earth's surface. The Moon orbits the Earth with an average period of 27.3 days. Determine the average Earth-Moon distance. Given the acceleration due to gravity on Earth, g = 9.8 m s and the Earth's radius, R. = 6.4 x 105 m