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Bernoulli's Equation: Finding the net force of wind blowing over a house

  1. Nov 5, 2011 #1
    1. The problem statement, all variables and given/known data
    If wind blows at 35m/s over a house, what is the net force on the roof if its area is 240m^2 and is flat?

    2. Relevant equations
    P=F/A and P1 + 1/2pv^2 = constant

    3. The attempt at a solution
    I have no idea on how to find pressure, because if I sub it into P1 + 1/2pv^2 = constant, it wouldn't work because the pressures would turn out the same because the roof is flat.
     
  2. jcsd
  3. Nov 5, 2011 #2

    SteamKing

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    That's funny. I don't see a term for 'flat roof' in the Bernoulli equation.

    However, look at the situation this way. The air under the roof is stagnant and has no velocity. The air above the roof is blowing with a velocity of 35 m/s.
    What you are saying is that P1 + 1/2p*0 = P1 + 1/2p*35^2
     
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