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Density in a U-tube

  1. Feb 3, 2009 #1
    1. The problem statement, all variables and given/known data
    A person blows across the top of one arm of a U-tube partially filled with water. The water in that arm.......?
    The answer is rises slightly: The water in that arm rises slightly.

    I really couldn't figure out why. Could someone help get me on the right track?
  2. jcsd
  3. Feb 3, 2009 #2
    What do you know about air pressure, and how does that pressure depend on the velocity of the air?
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