1. Not finding help here? Sign up for a free 30min 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!

Find difference in pressure in this water intake pump

  1. Apr 21, 2006 #1
    A water intake at a pump storage reservoir (Fig. 14-44) has a cross-sectional area of 0.87 m2. The water flows in at a speed of 0.35 m/s. At the generator building, at distance D = 180 m below the intake point, the cross-sectional area is smaller than at the intake and the water flows out at 9.8 m/s. What is the difference in pressure, in megapascals, between inlet and outlet?

    Im using Burnoulli's Equation:

    P1 -P2 = density(g)(Y1- Y2) + 1/2 (density)(V2^2 - V1^2)
    density of water = 1000
    so = (1000)(9.8)(180) + 1/2(1000)(9.8^2 - 0.35^2)
    = 1811958.75Pa/1.01x10^5Pa
    = 17.94 atm

    But then answer is in MPa, So then i get 1.794 x10^-6 MPa

    But that is not correct, is the analysis i made incorrect? I think i am missing something key in the problem. Thanks in advance.
     
  2. jcsd
  3. Apr 21, 2006 #2

    FredGarvin

    User Avatar
    Science Advisor

    Without looking at your problem set up your conversion from atm to MPa is incorrect. 17.9 atm = 1.81 MPa.
     
  4. Apr 21, 2006 #3
    Why did you convert from Pa to atm? Just convert Pa to MPa.
     
  5. Apr 21, 2006 #4
    to be honest, im not sure i did. silly.

    but is the analysis i did correct for the problem?
     
  6. Nov 24, 2008 #5
    Re: Pressure

    Did he do the question correct?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Find difference in pressure in this water intake pump
  1. Finding Water Pressure (Replies: 9)

Loading...