The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius r(h) = 0.474 m and mass 4.32 kg, and two thin crossed rods of mass 7.37 kg each. You would like to replace the wheels with uniform disks that are 0.0462 m thick, made out of a material with a density of 5990 kg/m^3. If the new wheel is to have the same moment of inertia about its center as the old wheel about its center, what should the radius of the disk, r(d) be?