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)

4flv²/2gd
flv²/gd
flv²/2gd
3flv²/2gd

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Hydraulics and Fluid Mechanics in ME
If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then

None of these
the pressure in the liquid mass is greater than hydrostatic pressure
there will be vacuum in the liquid
the pressure throughout the liquid mass is atmospheric

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