Figure shows a stepped shaft in torsion. The larger section also has a hole drilled throug...

Figure shows a stepped shaft in torsion. The larger section also has a hole drilled through.

(a) Compute the maximum shear stress at the step for an applied torque of 7500 lb-in.

(b) Determine the largest hole that could be drilled in the shaft and still maintain the stress near the hole at or below that at the step.

FIGURE