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Homework Help: Water Pipe Flow

  1. May 6, 2012 #1
    1. The problem statement, all variables and given/known data

    If water flows through a pipe at 0.8m/s , how many litres will flow through the pipe in 1 hour?

    I think I may be greatly overthinking this question, I keep thinking I need to take into the account of the trench length which is 500m, and the pipe size which is 0.5m diameter.

    Should I just m^2 * m/s = m*m*m / s = m³/s

    2. Relevant equations

    m^2 * m/s = m*m*m / s = m³/s
    Pipe diameter: 0.5m
    Trench length 500m (if relevent)

    3. The attempt at a solution

    I am just assuming the answer is:

    0.8 x 60 = 48

    48 x 60 = 2880

    Therefore the answer is 2880m in an hour.
    But im not sure how to convert this to litres.

    Should I use the velocity 0.8m/s and use dimensions?

    Sorry, such an easy question that has confused me!
  2. jcsd
  3. May 6, 2012 #2


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    Science Advisor
    Homework Helper
    Gold Member

    The length of the pipe has nothing to do with it. Given that the pipe is circular, wouldn't you expect ##\pi## to appear in the answer? Think of a circular slab of water that exits the pipe in 1 second. What would its volume be? That should get you started.
  4. May 6, 2012 #3
    0.5pie x 0.8
    =0.16 cubic metres/s
    x 120
  5. May 6, 2012 #4
    FYI, there are 1000 litres in a cubic metre.

    What is the area of the pipe cross-section?
    Using that, what length of pipe holds one litre?
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