A Wind with Speed 45 M/s Blows Across a Roof $\times$

question 14

Multiple Choice

A wind with speed 45 m/s blows across a roof 20 m long and 12 m wide.The pressure inside the room is 1 atm.What is the net force on this roof due to the pressure difference inside and outside the roof? (The density of air is equal to 1.3 kg/m³.)

• A)3.2 \(\times\) 10⁵ N
• B)2.4 \(\times\) 10⁷ N
• C)6.3 \(\times\) 10⁵ N
• D)7.0 \(\times\) 10³ N
• E)3.2 \(\times\) 10⁸ N

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