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. none of the above

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

D. supersonics, as with projectiles and jet propulsion

E. all of fhe above

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