Discussion
A wing swept \( 40 \) degrees flies at \( M = 0.90 \). Its effective section Mach number is nearest to
Answer: D
Computing \( 0.90 \times \cos 40^\circ = 0.90 \times 0.766 = 0.689 \). Notice that greater sweep has allowed a higher cruise Mach number while presenting the section with almost exactly the same normal component as a 35-degree wing at Mach 0.85.
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