고체역학 (Beer) — Torsion: Problem 3.25

3.25 The two solid shafts are connected by gears as shown and are made of a steel for which the allowable shearing stress is 7000 psi. Knowing the diameters of the two shafts are, respectively, \(d_{BC} = 1.6 \text{ in.}\) and \(d_{EF} = 1.25 \text{ in.}\), determine the largest torque \(T_C\) that can be applied at C.