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Water flow (Concept correct?)

  1. Apr 30, 2009 #1
    1. A hypodermic syringe contains a medicine with a density of water. The barrel of the syringe has a cross-sectional area of 2.5x10e-5 m^2. A force of 2N is exerted on the pluger (left, larger side). Determine the velocity of the medicine as it emerges from the needle

    _________
    \
    \
    (1) (2)=====
    /
    _________/

    2. P1 + 1/2pV1^2 + pghi = P2 + 1/2pV2^2 + pghf

    Area = 2.5x10e-5 m^s, Force = 2 N

    P1 = F/A = 80,000 Pascals

    Because Area decreases, Velocity increases decreasing pressure so we assume P2 = 0, is this correct why we make P2 = 0?
     
  2. jcsd
  3. Apr 30, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Inside the syringe pressure in the liquid is sum of atmospheric pressure and pressure due 2N force. Outside the syringe there is only atmospheric pressure.
     
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