Consider the two object below. One is very small (point object) with mass m, and
the other is a very thin rod of length L, mass M, whose mass is uniformly distributed.
The object of mass m is located a distance of d/en1 from the
left end and a distance of den2 from the right end of the rod.
What is the gravitational potential energy of the objects? If the gravitational
energy is U=n3 GmM/L, what is n3? Note that all the integers are unitless,
and that the reference U=0 is when they are infinitely far apart.
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