Conceptual question: Atmospheric pressure

[johnj7]

Homework Statement

A stream of water flows vertically downward at a speed of v1 = 2.0 m/s from a faucet of cross sectional area A = 0.5 cm^2 to the bottom of a sink a distance h = 20 cm below.

Homework Equations

Bernoulli's
P(atm) + (rho)gh = P(atm) + 0.5(rho)v^2

The Attempt at a Solution

solution v = 2.81 m/s

I understand how to get the velocity at the bottom, but I was just wondering why atmospheric pressure acts on both the top and the bottom. I can grasp how atmospheric pressure acts on the bottom of the stream, but how does it act on the top of the stream?

 

[johnj7]

sorry but can anyone answer / help me out?


bump (is this allowed?)

 

[Redbelly98]

Shouldn't there be a kinetic energy term on the left-hand side of the equation?