Discussion
An aircraft flies at \( 250 \) m/s where the speed of sound is \( 340 \) m/s. Its Mach number is nearest to
Answer: A
Mach number is the flow speed divided by the local speed of sound, so \( 250 / 340 = 0.735 \). The reciprocal, 1.36, is the standard slip. At this Mach number the aircraft is well into the range where compressibility must be accounted for, since the threshold is around 0.3.
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