Mach number is significant in_____________________?

A. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ships hulls

B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. all of fhe above

D. none of the above

E. supersonics, as with projectiles and jet propulsion

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