Hydraulics and Fluid Mechanics in ME
Bulk modulus of a fluid is the ratio of

Shear stress to shear strain
Increase in volume to the viscosity of fluid
Increase in pressure to the volumetric strain
Critical velocity to the viscosity of fluid

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

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