A hurricane wind blows across a 8.00m×16.0m flat roofat a speed of 140 km/h .

Part A:

Is the air pressure above the roof higher or lower than thepressure inside the house? Pick one. Explain.

The pressure above the roof is lower due to the lower velocityof the air.

The pressure above the roof is lower due to the higher velocityof the air.

The pressure above the roof is higher due to the lower velocityof the air.

The pressure above the roof is higher due to the highervelocity of the air.

Part B:

What is the pressure difference ?p=pinside?poutside? Use1.28 kg/m3 for the density of air. Treat the air as anideal fluid obeying Bernoulli's equation.

Express your answer using two significant figures. Answer shouldbe in (Pa)

Part C:

How much force is exerted on the roof?

Express your answer to two significant figures and include theappropriate 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 thehouse is greater than pressure on the top of the roof.

The roof will blow outward (up), because pressure inside thehouse is greater than pressure on the top of the roof.

The roof will blow outward (up), because pressure inside thehouse is less than pressure on the top of the roof.

The roof will blow inward (down), because pressure inside thehouse is less than pressure on the top of the roof.

Answer rating: 100% (QA)

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