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The centroid of a thin-walled section built from booms is found by

  • A.Locating the midpoint of the outer contour
  • B.Area-weighting the boom coordinates
  • C.Averaging the coordinates of the booms without weighting
  • D.Taking the second moment of the areas

Answer: B

The centroid is the area-weighted mean position, so each boom contributes its area times its coordinate. Simply averaging the positions would be right only if every boom had the same area, which on a real stiffened section is rarely true.

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