Discussion
The Mach angle in a flow at \( M = 1.4 \) is nearest to
Answer: A
From \( \sin\mu = 1/1.4 = 0.714 \), the angle is \( 45.6 \) degrees. Note the trend: as the Mach number falls towards one the cone opens out towards 90 degrees, and as it rises the cone becomes steadily more slender, which is why hypersonic bodies sit inside very thin shock layers.
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