Discussion
That same section carries a bending moment of \( 10 \) kN m. The extreme fibre stress is nearest to
Answer: C
The extreme fibre is \( 75 \) mm from the neutral axis, so \( \sigma = My/I = (10 \times 10^6 \times 75)/(1.406 \times 10^7) = 53.3 \) MPa, working in newtons and millimetres throughout. Mixing metres and millimetres is the usual source of error by a factor of a thousand.
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