If the atmospheric pressure in a housing area is 105Pa. What is the magnitude of the force exerted by the atmospheric gas on a flat horizontal roof of dimensions 5m×4m?
A
2×107 N
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B
2×106 N
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C
4×106 N
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D
8×106 N
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Solution
The correct option is B2×106 N Area of the roof = length×breadth = 5m×4m = 20 m2 Now, we know Pressure = ForceArea So, Force F = Pressure×Area F = 105Pa×20m2 = 2×106 N