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Homework Help: Finding the area of a pipe, rate of flow

  1. Nov 3, 2012 #1
    1. The problem statement, all variables and given/known data

    Water flows from a pipe at 650 L/min. a) What is the diameter of the pipe (in cm) of that pipe, if the water flows at 1.5 m/s?

    2. Relevant equations

    Q = V*A

    Now the equation for the area of a pipe is A = ∏r^2

    3. The attempt at a solution

    Q = 650 L/min
    V = 1.5 m/s

    So the equation should be A = Q/V

    A = (650 L/min) / (1.5 m/s)

    Now after this part I really have no clue, my next guess would be to possibly change units? But I'm not quite sure which units I'd have to change to to get the answer.

    I looked in the back of my book and the answer is 9.6 cm, but what use is the answer if you can't get there, right?

    Any help, hints etc would be appreciated :) thanks
  2. jcsd
  3. Nov 3, 2012 #2

    Simon Bridge

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    How many liters are there in a cubic meter?
    Hint 1 litre = 1 cubic decimeter = a cube 10cm on each side.
  4. Nov 3, 2012 #3
    A cubic metre would contain 1000 litres.

    I just solved it...turns out I was putting the decimal point in the wrong place...oh my gosh. Hahaha

    Thanks Simon.
  5. Nov 4, 2012 #4

    Simon Bridge

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    No worries. Just gotta watch those conversion factors ;)
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