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I'm struggling.

The full force formula applied to all 3 pairs of bodies gives a net acceleration of the Earth (in 1/r^2) biased towards the heavy ball. The force between the balls give a component...

Assumng that the tanks are open to atnosphere at sea level and are pure water:

Scotty is right. The water in the lower tank would be frozen!


Here is a headache inducing one:

If you drop...