Froude number is significant in:
- A. Supersonics, as with projectile and jet propulsion
- B. Full immersion or completely flow, as with pipes, air crafts wings, nozzles, etc.
- C. Simultaneous motion through two fluids where there is a surface discontinuity, gravity forces and wave making effect, as with ship's hulls
- D. All of these
Answer: C. Simultaneous motion through two fluids where there is a surface discontinuity, gravity forces and wave making effect, as with ship's hulls
Explanation: Froude number represents the ratio of inertia forces to gravity forces, significant in free surface flows.