Determine the average force of the wind on the building

AI Thread Summary
To determine the average force of the wind on a building, the problem involves calculating the impact of air moving at 140 km/h against a 60 m wide and 50 m high surface. The air density is given as 1.3 kg/m³, but the challenge lies in the lack of a time variable for impulse calculations. A hint suggests focusing on the volume of air that comes to rest in one second to facilitate the solution. Understanding the relationship between wind speed, air density, and the area of the building is crucial for finding the average force. The discussion emphasizes the need to approach the problem using the correct physical principles.
Fisicks
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Homework Statement


Air in a 140 km/h wind strikes head-on the face of a building 60 m wide by 50 m high and is brought to rest. If air has a mass of 1.3 kg per cubic meter, determine the average force of the wind on the building.

Homework Equations


The book seems to suggest the impulse equation.

The Attempt at a Solution


I have stared at the problem for a while. I thought I could use the impulse equation but I don't have a change in time. Also, it gives you the density which is in 3 dimensions and you only know two from the problem, length and height of the building. Overall, I'm just stumped which is weird for me.
 
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Hi Fisicks! :smile:
Fisicks said:
… I thought I could use the impulse equation but I don't have a change in time. Also, it gives you the density which is in 3 dimensions and you only know two from the problem, length and height of the building.

Hint: what is the volume of air stopped in one second? :wink:
 


thanks!
 
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