Discussion
A tension member of \( 250 \) mm\( ^2 \) area carries \( 60 \) kN. Its stress is
Answer: B
Correct answer: 240 MPa
\[ \sigma = \frac{F}{A} = \frac{60{,}000\ \mathrm{N}}{250\ \mathrm{mm^2}} = 240\ \mathrm{N/mm^2} = 240\ \mathrm{MPa}. \] Newtons per square millimetre are megapascals directly, which makes this the convenient unit set for airframe work - no conversion is needed provided the force is in newtons and the area in square millimetres.
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