Mach number is significant in___________________?

A. supersonics, as with projectiles and jet propulsion

B. none of the above

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

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

E. all of fhe above

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