Hydraulics and Fluid Mechanics in ME
A floating body is said to be in a state of stable equilibrium

when the metacentre is above the centre of gravity
when the metacentre is below the centre of gravity
when its metacentric height is zero
only when its centre of gravity is below its centre of buoyancy

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Hydraulics and Fluid Mechanics in ME
Mach number is significant in

supersonics, as with projectiles and jet propulsion
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
all of fhe above
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

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