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A 180 km/h hurricane wind blows over a house. If the flat roof of dimension 6.2m×12.4m is lifted off the house. Assume that the roof is not nailed down, what is the weight of the roof? Hint: The weight of the roof is equal to the force due to the pressure difference between the inside and outside of the house over the roof. The density of air is 1.29 kg/m3.

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