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Bernoulli's Equation help!

  1. Nov 30, 2004 #1
    I'm so confused here's the question...

    The wind blows with a speed of 30.0m/s over the roof of your house.

    A. Assuming the air inside the house is relatively stagnant, what is the pressure difference at the roof between the inside air and the outside air?

    B. What net force does this pressure difference produce on a roof having an area of 175m^2?

    I know that the first velocity is 30.0m/s and since the air inside is motionless therefore the second velocity is 0 m/s. Also the density of air is 1.29kg/m^3 and gravity is 9.81 m/s.

    My teacher said its a straight plug using this formula:

    P + 1/2 pv^2 + pgh which will equal the constant.

    But I don't get how to plug it in? Can anyone show me how is it done?
    Last edited: Nov 30, 2004
  2. jcsd
  3. Nov 30, 2004 #2


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    Staff Emeritus
    Science Advisor

    Please show us what you have done. What is "Benouilli's Equation"?
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