Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

v₁²/2g
0.375 v₂²/2g
v₂²/2g
0.5 v₁²/2g

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Hydraulics and Fluid Mechanics in ME
Froude number is significant in

All of the listed here
Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
Supersonics, as with projectile and jet propulsion
Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls

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