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 dis-continuity, gravity force, and wave making effects, as with ship’s hulls
• D. all of fhe above
• E. none of the above