1. The problem statement, all variables and given/known data The two small spheres of mass m each are connected by the light rigid rod which lies in the x-z plane. Determine the mass moments of inertia of the assembly about the x, y, z axes. I have attached an image of the question 2. Relevant equations 3. The attempt at a solution The answer is given but I don't understand how the answer is reached. For Ixx The slender bar of length 2L has no mass moment of inertia about x. Then the other two rods each have a mass moment of inertia of 1/3*ml2 or do these cancel out and it's only the spheres which give the system a mass moment of inertia? I think that, for the spheres, the mass moment of inertia should be: 2*(2/3)mr2 + 2ml2 Is the first portion, 2*(2/3)mr2, 0 because the radius is negligible small? This would leave me with 2mL2 Any guidance would be appreciated. Thank you.