Discussion
Air at Mach 0.85 has a total to static pressure ratio given by \( (1 + 0.2M^2)^{3.5} \). This ratio is approximately
Answer: B
Correct answer: 1.60
\[ \left(1 + 0.2 \times 0.85^2\right)^{3.5} = (1.1445)^{3.5} = 1.60. \] Even at high subsonic speed the ram compression is worth 60 per cent in pressure before the compressor does anything - and since the exponent is 3.5, the ratio climbs very steeply as the Mach number rises further.
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