Beer & Johnston — Torsion: Problem 3.16

3.16 The allowable shearing stress is 15 ksi in the steel rod AB and 8 ksi in the brass rod BC. Knowing that a torque of magnitude \( T = 10 \text{ kip}\cdot\text{in.} \) is applied at A, determine the required diameter of (a) rod AB, (b) rod BC.