A horizontal board of negligible thickness and area 2.0 m2 hangs from a spring scale that reads 80 N when a 4.0 m/s wind moves above the board. The air below the board is stationary. When the wind stops, the scale reads AnswerN. The density of air is 1.25 kg/m3 and treat the air as an ideal fluid

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.