The maximum speed that a ywheel can reach without yielding or fracturing is a measure of its strength. In this problem, you have a rotating

The maximum speed that a flywheel can reach without yielding or fracturing is a measure of its strength. In this problem, you have a rotating ring made of hot-forged AISI 1020 steel; the ring has a 3.6-in inside diameter and a 6-in outside diameter and is 0.5 in thick. The maximum radial stress occurs at r = (rori)1/2 (See Equation 3-55). Take ro = 3 in and ri = 1.8 in