Question: A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from

A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If >> a, show that the difference in the gravitational force exerted on the two masses by the Earth is approximately 4GmMEa/r3.

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