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Physics Buoyancy Problem

  1. Dec 12, 2012 #1
    1. The problem statement, all variables and given/known data
    Frensley_Fluids_Bernoulli_012.gif


    A house has a roof with an area of 220 m2. Wind blows over the top with a speed of 10 m/s. The density of air is 1.29 kg/m2. The air inside the house is stagnant. Point A is just inside the roof, and point B is outside the roof at the same height.

    (a) What is the difference in pressure (PA - PB) between points A and B?


    (b) What force is applied to the roof by the inside air?



    2. Relevant equations
    This is where I'm stuck at


    3. The attempt at a solution
    I don't know what equations to apply here, they all involve mass, but that's not a given.
     
  2. jcsd
  3. Dec 12, 2012 #2

    gneill

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    Staff: Mentor

    Have you studied the Venturi effect? Look it up.
     
  4. Dec 12, 2012 #3
    Yes, i've studied it, but how does that apply here?
     
  5. Dec 12, 2012 #4

    gneill

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    Staff: Mentor

    Um, air flowing faster over roof than under roof... air pressure difference... area of roof...
     
  6. Dec 12, 2012 #5
    Oh yes, I realized that, but I don't know where to go from there, what equations should I use.
     
  7. Dec 12, 2012 #6

    gneill

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    Staff: Mentor

    What equation pertains to the venturi effect? Look up venturi effect.
     
  8. Dec 13, 2012 #7

    rude man

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    Homework Helper
    Gold Member

    Check Bernoulli.
     
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