고체역학 (Gere) — Torsion: Problem R-3.13

R-3.13 A motor drives a shaft at \(f = 10 \text{ Hz}\) and delivers \(P = 35 \text{ kW}\) of power. The allowable shear stress in the shaft is \(45 \text{ MPa}\). The minimum diameter of the shaft is approximately: (A) 35 mm (B) 40 mm (C) 47 mm (D) 61 mm