Discussion
A closed box \( 0.5 \) m by \( 0.3 \) m in its wall centrelines carries \( 90 \) kN m of torque. Its shear flow is
Answer: B
The enclosed area is \( 0.5 \times 0.3 = 0.15 \) m\( ^2 \), so \( q = 90\,000/(2 \times 0.15) = 300 \) kN/m. Using the outer dimensions rather than the centrelines is a small but systematic error that always overstates the area.
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