Discussion
A boomed section has booms of \( 500 \) mm\( ^2 \) at \( \pm 150 \) mm and \( 500 \) mm\( ^2 \) on the neutral axis. The neutral-axis boom's contribution to the shear flow step is
Answer: C
The step is proportional to the boom's first moment about the neutral axis, and a boom lying on that axis has a zero first moment. It contributes nothing to the shear flow, though it still adds area and so affects the centroid position.
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