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Simple volume flow rate calculation

  1. Feb 16, 2008 #1
    [SOLVED] Simple volume flow rate calculation

    A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. Liquid flows through the first segment at a speed of 4.0m/s. The speed in the second segment is 1m/s, and the speed in the 3rd segment is 16 m/s

    I thought that volume flow rate was simply Av, but I've tried many combinations of the 3 cross-sectional areas and 3 speeds with no success. Do I need to add them all up and multiply? Do I need to take averages? Oh, and should I have my units in terms of meters or centimeters? I'm really baffled as to why my answers aren't working, because I know it's a fairly simple problem. Any help would be appreciated. Thanks
  2. jcsd
  3. Feb 16, 2008 #2


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    All three should give the same answer when multiplying the area and the velocity. Check your units and that you're using radius not diameter.
  4. Feb 16, 2008 #3
    Got it. I was off by a factor of 10. Thanks
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