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Question
Mach number is significant in
Options:
A .  supersonics, as with projectiles and jet propulsion
B .  full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C .  simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
D .  all of fhe above
Answer: Option A
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