Hydraulics and Fluid Mechanics in ME
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)

Q = (2/3). Cd × a × h
Q = (3Cd × a)/√(2h)
Q = (Cd × a)/√(2gh)
Q = Cd × a × 2gh

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Hydraulics and Fluid Mechanics in ME
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is

cannot be predicted from the given data
one-fourth its value when cylinder was full
one-half its value when cylinder was full
zero

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