Problem B6:
Consider the three small objects shown below. One object, mass M, remains stationary
between the other two. The other two objects, each with a mass of n_{2}M,
rotate around the object in the center with a speed v. The distance from the
rotating masses to the center is d/n_{1}. If the speed squared is
v^{2}=n_{3}GM/d, what is n_{3}? Note that all
the integers are unitless.

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