Discussion
A composite panel of \( 2.0 \) mm thickness replaces an aluminium one of \( 3.0 \) mm at densities of \( 1.56 \) and \( 2.70 \). The weight saving is
Answer: A
Comparing mass per unit area, \( 2.0 \times 1.56 = 3.12 \) against \( 3.0 \times 2.70 = 8.10 \), a saving of \( 1 - 3.12/8.10 = 0.615 \). Real structures achieve rather less, since joints, lightning protection and damage allowables all erode the theoretical gain.
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