Recall, an object with mass in a circular orbit with period and radius has orbital angular momentum . If the object is in Keplerian orbit about an object of much higher mass , its orbital period is . A spherical object with uniform density of mass and radius spinning with period has spin angular momentum . A) Compute the angular momentum of the Earth's spin, of the moon's spin, and of the moon's orbit about the Earth. Which of the three do you think it is safest to ignore? HINTS: Be careful to use correct units when performing your calculations and in expressing your answers. Angular momentum has units . For the spin angular momentum, your , , and will be different for the Earth and the moon. In figuring out one of these numbers, it will be helpful to remember that the moon's spin is tidally locked to its orbit. B) We know that the moon has been slowly moving farther away from the Earth, so in the past it must have been closer. Suppose in the distant past, the moon started out basically touching the Earth (so that the center of the moon was one lunar radius from