Please help with centroidal radius of gyration!
An automobile wheel-and-tire assembly with a total weight 47...
An automobile wheel-and-tire assembly with a total weight 47 lbs is attached to a mounting plate of negligible weight which is suspended from a steel wire. The torsional spring constant of the wire is known to be K = 0.40 lb-in./rad. The wheel is rotated through 90° about the vertical and then released. Knowing that the period of oscillation is observed to be 66 s, determine the centroidal mass moment of Inertia and the centroldal radius of gyration of the wheel-and-tire assembly. The centroidal mass moment of Inertia is 3.67795 Ib-s2.ft. The centroldal radius of gyration of the wheel-and-tire assembly is 8.66 In.