How much force is exerted on the roof?

[lindsey4]

Homework Statement

A hurricane wind blows across a 6.0mX15.0m flat roof at a speed of 130 km/h. Is the air pressure above the roof higher or lower than the air pressure inside the house? What is the pressure difference? How much force is exerted on the roof? If the roof cannot withstand the force, will it blow in or out?

Homework Equations

not sure

The Attempt at a Solution

I think you use something like Bernouli's principle but I really have no clue

 

[haruspex]

I think you use something like Bernoulli's principle but I really have no clue

Yes. See equation A at http://en.wikipedia.org/wiki/Bernoulli's_principle.

 

[RTW69]

You are looking for the dynamic pressure part of the Bernoulli equation. Pressure=Force/area