A 540-kg spacecraft first is placed into a circular orbit about the earth at an altitude of 4500 km and then is transferred to a circular orbit about the moon, Knowing that the mass of the moon is 0.01230 times the mass of the earth and that the radius of the moon is 1740 km. determine (a) the gravitational force exerted on the spacecraft as it was orbiting the earth, (b) the required radius of the orbit of the spacecraft about the moon if the periodic times of the two orbits are to be equal, (c) the acceleration of gravity at the surface of the moon. (The periodic time of a satellite is the time it requires to complete one full revolution about a planet.)
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