Which Point Has the Lowest Pressure in a Fluid System?

[MechaMZ]

Homework Statement

Let's say the surface of the fluid is very big as compare to the tube diameter.
Are my assumptions below correct?

V_A=0

V_B(inlet of the tube) = V_E, i think so because the diameter of the tube is constant.
And the velocity through the tube all are constant.

or V_B(inlet of the tube) = 0? but it could be right?

Which point has the lowest pressure? should be P_C or P_E?

Are the pressure of P_B and P_E the same?

Is the P_D = 0?

will all the pressure be different value if the fluid in a stationary motion?

thanks all.

 

[MechaMZ]

anyone can help in this question??