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Conceptual question: Atmospheric pressure

  1. Sep 1, 2008 #1
    1. The problem statement, all variables and given/known data
    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.

    2. Relevant equations
    P(atm) + (rho)gh = P(atm) + 0.5(rho)v^2

    3. 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?
  2. jcsd
  3. Sep 5, 2008 #2
    sorry but can anyone answer / help me out?

    bump (is this allowed?)
  4. Sep 5, 2008 #3


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