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Kepler's Laws and Earth Satellites

Calculate the center of mass of the Earth-Moon system, if the radius of the earth is 6380 km is it inside the earth? For the MOON and the EARTH [M sub E = 6.0 x 10^24kg, M sub M = 7.4 x 10^22 kg], [R sub orbit = 3.84 x 10^8 m]