Understanding Bernoulli's Principle in Fluid Dynamics: Quick Question Answered

[fobbz]

I understand everything up to B). I believe Bernoulli's is applicable here, however I am unsure as to whether or not the pressure before the tube (pgh) is the same or different as the pressure at the tube pgh +p0. I ask the same question for the opposite end of the tube.
I know that pressure is constant along a horizontal line however at the tube the water is open to the atmosphere and thus experiences that pressure, and also has a higher depth than before the tube.

 

[tiny-tim]

hi fobbz!

… I am unsure as to whether or not the pressure before the tube (pgh) is the same or different as the pressure at the tube pgh +p0. I ask the same question for the opposite end of the tube.
I know that pressure is constant along a horizontal line …

that's correct …

Bernoulli's equation is valid along any streamline, and that horizontal line is a streamline

(that open vertical tube would only make a difference if it caused the streamline to be no longer horizontal)