- #1

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The author's pick the datum line at the middle of the jet and show that:

[itex]h = \dfrac{p}{\gamma} + \dfrac{V^2}{2g}[/itex]

where [itex]h[/itex] is the distance from the jet to the surface of the liquid.

The author's then assume that the streamlines are straight and parallel and say that the acceleration of the fluid is due only to the pressure from above and below the infinitesimal particle. Why is this so? Why doesn't the horizontal pressure have any effect on the acceleration?