In the figure, two particles, each with mass m = 0.77 kg, are
fastened to each other, and to a rotation axis at O, by two thin
rods, each with length d = 5.2 cm and mass M = 1.0 kg. The
combination rotates around the rotation axis with angular speed ? =
0.32 rad/s. Measured about O, what is the combination's (a)
rotational inertia and (b) kinetic energy?