A liquid having area of free surface A and has an orifice at a depth of h with an area a, below the liquid surface, then find the velocity v of flow through the orifice

Derive an equation for the total pressure at a depth 'h' below the liquid surface.

What is absolute pressure at a depth h below the surface of the liquid?

A pump is designed as a horizontal cylinder with a piston of area A and and outlet orifice of area a arranged near the cylinder axis. Find the velocity of out flow of the liquid from the pump if the piston moves with a constant velocity under the action of a constant force F. The density of the liquid is rho .

Surface tension of a liquid is independent of the area of the surface.