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19.
REASONING
Newton’s law of universal gravitation indicates that the gravitational
force that each uniform sphere exerts on the other has a magnitude that is inversely
proportional to the square of the distance between the centers of the spheres.
Therefore, the maximum gravitational force between two uniform spheres occurs
when the centers of the spheres are as close together as possible, and this occurs
when the surfaces of the spheres are touching.
Then, the distance between the
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 Spring '08
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