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The centers of a 9 kilogram lead ball and a 100 gram lead ball are separated by 13 centimeter.
(a) Find what gravitational force does each exert on the other?
N
(b) Find the ratio of this gravitational force to the weight of the 100 gram ball?
F / W100 g =
In a classical model of the hydrogen atom, the electron orbits a stationary proton in a circular orbit
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