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Discussion
Mach number is significant in
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 discontinuity, gravity force, and wave making effects, as with ship's hulls
D.
All of the above
Answer:
A
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