Card 34 / 41: The 747 airliner is capable of approximately Mach 0.9 at altitude. The claimed air speed is about 590 mph. What is the temperature of air used in that calculation?
A)
−100 °C
B)
− 60 °C
C)
− 20 °C
D)
0 °C
Answer:
B) − 60 °C
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