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

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