Hydraulics and Fluid Mechanics in ME
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

flv²/gd
flv²/2gd
4flv²/2gd
3flv²/2gd

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Hydraulics and Fluid Mechanics in ME
In a forced vortex motion, the velocity of flow is

directly proportional to its radial distance from axis of rotation
inversely proportional to the square of its radial distance from the axis of rotation
directly proportional to the square of its radial distance from the axis of rotation
inversely proportional to its radial distance from the axis of rotation

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