Prob. 4.5-2. A brass shaft AC (G = 5.6 × 10³ ksi) is sub- jected to torsional loads at sections B and C, as shown in Fig. P4.5-2. The outside diameter

of the shaft is d =d₁2=d= 1.25 in. A central hole of diameter d = 0.75 in. has been drilled from C to B, creating a two-segment shaft with lengths L₁ L₂ = 10 in. If the two applied torques are TR = 400 lb in. and Te = 200 lb in., respectively, (a) determine the maximum shear stress in the two-segment shaft, and (b) determine the angle of rotation oc (in radians) at the end of the shaft. (Note that both torque T and Te are pos- itive, meaning that both torques act in the sense shown in Fig. P4.5-2.)