Discussion
Comparing that laminate at \( 139 \) GPa and \( 1.56 \) g/cm\( ^3 \) with aluminium at \( 70 \) GPa and \( 2.70 \), the specific stiffness ratio is nearest to
Answer: A
Specific stiffness is \( 139/1.56 = 89.1 \) against \( 70/2.70 = 25.9 \), a ratio of about 3.4. That figure, along the fibre direction, is the headline argument for composites, though a real laminate with off-axis plies does far less well.
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