A hurricane wind blows across a 8.00m×16.0m flat roof at a speed of 140 km/h ....
A hurricane wind blows across a 8.00m×16.0m flat roof at a speed of 140 km/h .
Part A:
Is the air pressure above the roof higher or lower than the pressure inside the house? Pick one. Explain.
| The pressure above the roof is lower due to the lower velocity of the air. |
| The pressure above the roof is lower due to the higher velocity of the air. |
| The pressure above the roof is higher due to the lower velocity of the air. |
| The pressure above the roof is higher due to the higher velocity of the air. |
Part B:
What is the pressure difference Δp=pinside−poutside? Use 1.28 kg/m3 for the density of air. Treat the air as an ideal fluid obeying Bernoulli's equation.
Express your answer using two significant figures. Answer should be in (Pa)
Part C:
How much force is exerted on the roof?
Express your answer to two significant figures and include the appropriate units. Be sure to give the units in the answer
Part D:
If the roof cannot withstand this much force, will it "blow in" or "blow out"?
If the roof cannot withstand this much force, will it "blow in" or "blow out"? Pick one
| The roof will blow inward (down), because pressure inside the house is greater than pressure on the top of the roof. |
| The roof will blow outward (up), because pressure inside the house is greater than pressure on the top of the roof. |
| The roof will blow outward (up), because pressure inside the house is less than pressure on the top of the roof. |
| The roof will blow inward (down), because pressure inside the house is less than pressure on the top of the roof. |
Homework Answers
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A hurricane wind blows across a 8.00m×16.0m flat roof at a speed
of 140 km/h ....
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