Q: What is the moment of inertia of each ball around its own center? I (ball around own center) = (2/5) M R^2 = (2/5) (5 kg) * (0.3 m)^2 = 0.18 kg*m^2 Q: What is the distance from the center of each stick to the axis of rotation? d = 0.3 m + (0.7 m / 2) = 0.65 m Q: What is the moment of inertia of each ball around the center? I (ball around "x") = I (ball around own center) + M*d^2 = 0.18 kg*m^2 + (5 kg) * (0.65 m)^2 = 2.29 kg*m^2 Q: What is the moment of inertia of the rod? I (rod) = (1/12) m L^2 = 0.0625 kg*m^2 Q: What is the moment of inertia of the entire object? I (all around "x") = 2 * I (ball around "x") + I (rod) = 2 * 2.29 kg*m^2 + 0.0625 kg*m^2 = 4.65 kg*m^2