Hydraulics and Fluid Mechanics in ME
Reynolds number is significant in

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
supersonics, as with projectile and jet propulsion
All of these

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Hydraulics and Fluid Mechanics in ME
When a body is placed over a liquid, it will sink down if

Gravitational force is more than the up-thrust of the liquid
Gravitational force is equal to the up-thrust of the liquid
Gravitational force is less than the up-thrust of the liquid
None of these

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