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Homework Help: Aspirator fluids

  1. Nov 16, 2012 #1
    1.A tube of radius 5 cm is connected to tube of radius 1 cm. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×10^5 Pa. The density of water is 1000 kg/m3. Assume that the water is nonviscous and uncompressible.
    What is the velocity of the water in the 5 cm radius tube?

    2. Flow rate of liquid = Velocity X Area.

    3. I believe the units are messing me up. Im not sure about the 10 liters/min. but my equation: 10 liters/min = (1000)x(5^2)(∏)(V) I am not coming up with the correct answers, and dont know if this is even close to the right equation. can somone point me in the right direction?
  2. jcsd
  3. Nov 16, 2012 #2
    The volume and area need to have the same length units.
  4. Dec 6, 2012 #3
    convert the Liters into milliliters (L-mL) and use the conversion 1mL=1cm^3 than change minutes into seconds (1min=60sec)
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