Discussion
A wall carrying a shear flow of \( 100 \) kN/m is \( 2.5 \) mm thick. The shear stress in it is
Answer: C
Shear stress is flow over thickness, \( 100\,000/0.0025 = 40 \times 10^6 \) Pa. Because the flow is constant round a cell under torsion, a wall half this thickness would carry twice the stress and would be the critical one.
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