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Homework Help: An airplane's lift

  1. Jan 16, 2007 #1
    1. The problem statement, all variables and given/known data
    What is the net upward force on an airplane wing of area 20 m2 if the speed of air flow is 300 m/s across the top and 280 m/s across the bottom.

    2. Relevant equations

    3. The attempt at a solution

    I have a feeling that this is an easy question, but i just don't know how to solve it!! Any hints would be greatly appreciated.
  2. jcsd
  3. Jan 16, 2007 #2


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    Hint: there is a lift force is because the pressure on the top and bottom surfaces of the wing are different.

    What equations do you know that relate pressure in a fluid to the speed of flow?
  4. Nov 29, 2007 #3
    So that would be Bernoulli's equation, right?
    But how would you use that in this case?
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