Hydraulics and Fluid Mechanics in ME
In a forced vortex motion, the velocity of flow is

inversely proportional to the square of its radial distance from the axis of rotation
directly proportional to the square of its radial distance from the axis of rotation
directly proportional to its radial distance from axis of rotation
inversely proportional to its radial distance from the axis of rotation

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Hydraulics and Fluid Mechanics in ME
Froude number is significant in

Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
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

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