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Q. A bowling ball (mass = 7.9 kg, radius = 0.11 m) and a billiard ball (mass = 0.39 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?

Q. A locomotive is pulling 17 freight cars, each of which is loaded with roughly the same weight. The mass of each can be taken to be 37,000 . If the train is accelerating at on a level track, what is the tension in the coupling between the second and third cars? The car nearest the locomotive is counted as the first.

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