Kelvi

A wind with speed 40 40 ms−1^{-1} blows parallel to the roof of a house. The area of the roof is 250 250 m2.^2. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be (ρair=1.2 (\rho_{air} = 1.2 kg m−3)^{-3})

medium
Mechanical Properties of Fluids
2015
physics
1. 

4.8×1054.8 \times 10^5 N, upwards

2. 

2.4×1052.4 \times 10^5 N, upwards

3. 

2.4×1052.4 \times 10^5 N, downwards

4. 

4.8×1054.8 \times 10^5 N, downwards

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