Problem D3:
The three objects in the figure above are attached to each other by
massless rods. The three objects lie on the x-axis. The object
at the origin has a mass of 5 Kg. The object one meter to the right
of the origin has a mass of n_{1} Kg. The third object,
located 2 meters to the right of the origin, has a mass of
n_{2} Kg. If the system is to rotate about the y-axis, what
is its rotational inertia. If the rotational inertial about the
y-axis is n_{3} Kg-m^{2}, what is n_{3}?

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