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Calculate the smaller section's pressure

  1. Nov 8, 2007 #1
    1. The problem statement, all variables and given/known data

    A liquid (p = 1.65 g/cm3) flows through two horizontal sections of tubing joined end to end. In the first section the cross-sectional area is 10.0 cm2, the flow speed is 265 cm/s, and the pressure is 1.20 x10^5 Pa. In the second section the cross-sectional area is 3.50 cm2.

    a) Calculate the smaller section's flow speed. 7.67m/s

    (b) Calculate the smaller section's pressure. ?

    2. Relevant equations

    p=1.65g/cm^3 =.00165kg/cm^3
    A1=10cm^2
    v1=265cm/s
    P1=1.2x10^5pa
    A2=3.5cm^2
    V2=7.67m/s = 767cm/s
    P2=?

    P1+1/2pv1^2=P2+1/2pv2^2

    3. The attempt at a solution

    I'm getting an incorrect answer for P2 in question b, but i'm not sure what i'm doing wrong.

    I got 1.19**10^5, but that is incorrect. Any ideas?

    Thank you
     
  2. jcsd
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