Hydraulics and Fluid Mechanics in ME
Mach number is significant in

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

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Hydraulics and Fluid Mechanics in ME
The meatcentric height is the distance between the

Centre of gravity of the floating body and the metacentre
Metacentre and centre of buoyancy
Centre of gravity of the floating body and the centre of buoyancy
Original centre of buoyancy and new centre of buoyancy

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Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
2A × √H₁/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × √H₂/Cd × a × √(2g)

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