## Solved Examples

There are two particles of mass m and 2m that are connected by a rigid, thin, massless rod AB of
length L. There is another thin, massless rod CD of length 2L, that connects two other particles of
mass 2m and 3m. The two rods are welded together at a point O, to form a single rigid body. The point
O is chosen such that , and . Let the moment of inertia of the
system about an axis passing through O, and perpendicular to the plane of the two rods be *I*, find I.