Physics, 15.04.2020 02:55 mikequntana512

A hurricane wind blows across a 8.00m×13.0m flat roof at a speed of 110 km/h.

I NEED HELP ON PART C!

PART A: Is the air pressure above the roof higher or lower than the pressure inside the house? Explain.

a) The pressure above the roof is higher due to the higher velocity of the air.

b) The pressure above the roof is lower due to the higher velocity of the air.

c) The pressure above the roof is lower due to the lower velocity of the air.

d) The pressure above the roof is higher due to the lower velocity of the air.

Correct answer is C

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.

Δp = 1/21.28(30.56m/s)^2

Δp = 598 Pa

PART C: How much force is exerted on the roof?

PART D: If the roof cannot withstand this much force, will it "blow in" or "blow out"?

a) The roof will blow outward (up), because pressure inside the house is less

than pressure on the top of the roof.

b) The roof will blow inward (down), because pressure inside the house is

greater than pressure on the top of the roof.

c) The roof will blow outward (up), because pressure inside the house is

greater than pressure on the top of the roof.

d) The roof will blow inward (down), because pressure inside the house is

less than pressure on the top of the roof.

Correct answer D

Answers: 3

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A hurricane wind blows across a 8.00m×13.0m flat roof at a speed of 110 km/h.

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