Calculating Pressure in Pipes: How to Solve for Unknown Entrance Pressure?

[foo9008]

Homework Statement

[/B]
in this question , the Pressure at entrance is not given , how to do this?

Homework Equations

The Attempt at a Solution

does the author mean the pressure at entrance = pressure at exit

 

[billy_joule]

Homework Statement

in this question , the Pressure at entrance is not given ,

You are expected to find it from the depth of the tank.

 

[foo9008]

You are expected to find it from the depth of the tank.

i am going to use this equation to solve this question , where z = 10 m what is the pressure at ENTRANCE ? it's not given

p/s : hf = 0

 

[billy_joule]

It's unclear where the two points on your streamline are.pipe entry and exit? Or free surface and pipe exit?
If z=0 is along the pipe axis then z=10 is the water surface, and the pressure there is equal to the exit pressure so both can be set to zero.