The orbit of earths moon has a period of 27.3 days and a, Ask an Expert

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Q. The orbit of earth's moon has a period of 27.3 days and a radius (semi-major axis) of 2.56 x 10-3 A.U. (= 3.84 x 105 km). What is the mass of Earth? What are the units? Show the work.

Q. suppose that the cannon is fired at time t = 0 and that the cannonball hits ground at time t_g. What is the y position of the cannonball at the time t_{rm g}/2?

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