Question

A solid sphere of radius R, a solid cylinder of radius R, and a rod of length R all have the same mass, and all three are rotating with the same angular velocity. The sphere is rotating around an axis through its center. The cylinder is rotating around its long axis, and the rod is rotating around an axis through its center but perpendicular to the rod. 1) Which one has the greatest rotational kinetic energy

Answer 1

I(sphere) = 2/5 M R^2

I(rod) = 1/3 M L^2

I(cylinder) = 1/2 M R^2

From the information given I would assume that

the cylinder is the correct answer.