How much force is the air exerting on the front surface of the book with dimensions 19 x 27 cm. Assume atmospheric pressure equal to 100,000 Pa.

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  1. recall pressure is force per unit area, or
    P = F/A
    where the force is in Newton (N) , pressure is in Pascal (Pa) and area is in square meters (m^2)
    thus, we first convert the dimensions to meters:
    19 cm = 0.19 m
    27 cm = 0.27 m
    A = 0.19*0.27 = 0.0513 m^2
    100000 = F / (0.0513)
    F = 100000*0.0513
    F = 5130 N

    hope this helps~ :)

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