A solid sphere and a solid cylinder with the same mass are both spinning around their principal axis at the same angular velocity $($for the cylinder this means the cylinder is spinning like it would if rolling down a hill$).$ If the sphere has a radius $5$ times bigger than the radius of the solid cylinder, how do their rotational energies compare? Isphere $=(2/5)$MR$2,$ Icylinder $=(1/2)$MR$2$