Discussion
If that same box's critical wall were thickened to \( 3 \) mm, the shear stress would become
Answer: A
The flow is unchanged at 100 kN/m, so the stress becomes \( 100\,000/0.003 = 33 \) MPa. Thickening the wall reduces the stress in proportion but does nothing to the flow, which is fixed by the torque and the enclosed area.
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