Discussion
Four booms of \( 400 \) mm\( ^2 \) sit at the corners of a box \( 200 \) mm deep. The idealised second moment of area about the horizontal axis is
Answer: B
Each boom lies \( 100 \) mm from the axis, so \( I = 4 \times 400 \times 100^2 = 1.6 \times 10^7 \) mm\( ^4 \). Adding effective skin areas to each boom would raise this, which is precisely why the effective width matters.
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