1. The aluminum rod AB (G =27 GPa) is bonded to the b ass rod BD (6 39 GPa). The portion CD of the brass rod is hollow and has an inner diameter of 40 mm, determine the angle of twist at A. hellow 60 mm ↓ 250 ऋट mm TB = 1600 N.m +3.75 +4.00 mm MT 36mm A = 800 N.m 2. The solid shaf: shown is formed of a brass for which the allowable shearing stress of 55 MPa. Determine the smallest diameters of AB and BC for which the allowable shearing stresses is not exceeded. dam T = 1200 N. m doc Te= = 400 N. m +750 mm 3. Shaft BC is hollow with inner and outer diameters of 90 mm and 120 ram, respectively. Shafts AB and CD are solid and of diameter d. For the loading shown, determine (a) the maximum shearing stress in shaft BC, (b) the required diameter of shafts AB and CD if the allowable shearing stress in these shafts is 65 MPa. d 0.9m 14 kN.m" 26 KN.M GIN.M 0.7m 0.5m D