The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.315 meter and mass 5.65 kilogram, and two thin crossed rods of mass 9.09 kilogram each. You would like to replace the wheels with uniform disks that are 0.0525 meter thick, made out of a material with a density of 5990 kilograms per cubic meter. If the new wheel is to have the similar moment of inertia about its center as the old wheel about its center, evaluate what should the radius of the disk be?