Discussion
At a static temperature of \( 250 \) K, the flow speed corresponding to \( M = 0.3 \) is nearest to
Answer: C
First the speed of sound: \( \sqrt{1.4 \times 287 \times 250} = \sqrt{100\,450} = 316.9 \) m/s. Then \( 0.3 \times 316.9 = 95.1 \) m/s. The colder air gives a lower threshold speed than the 102 m/s that applies at sea level, so compressibility sets in at a lower true airspeed at altitude.
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