1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Need Hmwk Help . Fluid mechanics, Fluids in Motion, Pressure

  1. Dec 11, 2009 #1
    College Physics

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

    The figure shows a syringe with a 4.0-cm-long needle, filled with water at 20celsius.
    What is the gauge pressure of the water at the point P, where the needle meets the wider chamber of the syringe?

    http://session.masteringphysics.com/problemAsset/1014207/7/jfk.Figure.P13.38.jpg


    2. Relevant equations

    Bernoulli's Equation


    3. The attempt at a solution
    I haven't even reached a solution yet because I am totally lost....
    I just need some guidance/help working through the problem.
     
  2. jcsd
  3. Dec 11, 2009 #2
    The answer is 3200 Pa.

    However, I do not know how to arrive at that solution. I'd reallllyyyyy appreciate it if someone could walk me through it, step by step.
     
  4. Dec 11, 2009 #3

    ideasrule

    User Avatar
    Homework Helper

    Use Bernoulli's principle. Apply it to the two points where you have the most information: just outside the narrow tube, and very near the piston. You can figure out the speed of the piston from the volume continuity equation.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Need Hmwk Help . Fluid mechanics, Fluids in Motion, Pressure
Loading...