prob_018 - 18. REASONING The magnitude of the gravitational...

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18. REASONING The magnitude of the gravitational force that each part exerts on the other is given by Newton’s law of gravitation as 2 12 / FG m mr = . To use this expression, we need the masses m 1 and m 2 of the parts, whereas the problem statement gives the weights W 1 and W 2 . However, the weight is related to the mass by W = mg , so that for each part we know that
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