Discussion
Using \( (1 + 0.2M^2)^{3.5} \), the ram pressure ratio available at Mach 3 is approximately
Answer: A
Substituting gives \( 2.8^{3.5} \approx 36.7 \). A ratio of that size from forward speed alone exceeds what many mechanical compressors deliver, which is precisely why a ramjet needs no rotating machinery at that speed.
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