Volume flow rate from pressure difference between tubes

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Homework Statement


In ideal flow, a liquid of density 810 kg/m3 moves from a horizontal tube of radius 1.60 cm into a second horizontal tube of radius 0.800 cm at the same elevation as the first tube. The pressure differs by ΔP between the liquid in one tube and the liquid in the second tube.
(a) Find the volume flow rate as a function of ΔP.

Homework Equations

The Attempt at a Solution


Completely lost, not sure where to start.
 

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Ok. What is the principle that deals with ideal fluids in motion?