MHT CET 2025 Physics question
A wind with speed 50 m/s blows parallel to the roof of a house. The area of the roof is 300 m. Assume that the pressure inside the house is atmospheric pressure. Density of air is 1.2 kg/m. The magnitude of the force exerted by the wind on the roof will be
Answer: (C)
Solution
Fast-moving air over the roof lowers the pressure there (Bernoulli's principle), while the pressure inside the house remains atmospheric. The pressure difference is Pa (the air inside the house is at rest). The net force on the roof is
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