Two particles, each with mass m = 0.89 kg, are fastened to each other, and to a rotation axis at O

美國高中 AP Physics C ME HW43 #4
In the figure below, two particles, each with mass m = 0.89 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d = 5.5 cm and mass M = 1.3 kg. The combination rotates around the rotation axis with angular speed ω = 0.32 rad/s.
Measured about O, what is the combination's rotational inertia?
What is the combination's kinetic energy?

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