What is the ratio of the rotational inertia to the translational inertia of an r = 0.550 m solid sphere? A flywheel is a mechanical device used in a variety of applications to store energy or stabilize motion. Typical flywheels are essentially cylinders mounted on an axle. A solid, cylindrical flywheel has a mass of m = 2.40 kg and a radius of r = 0.475 m. Find the moment of inertia of the flywheel about a central axis. Your answer should be entered in units of kg-mz