Two solid shafts, each 12 inches long, are connected by gears as shown. They are made of a steel that has a shear modulus of 11,501 ksi and which will fail with a shear stress is 8.9 ksi or if either rod experiences a total angle of twist along its length greater than 2. Knowing that a torque of magnitude Tc = 5 kip-in. is applied at C and that the assembly is in equilibrium, determine the minimum diameter of shafts BC and EF that will maintain a safety factor of 3. Copyright McGraw-Hill Education Parmission required for reproduction or display 4 in.. 2.5 in.. D G B E H Tc F TF