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15 June, 20:37

One of the dangers of tornados and hurricanes is the rapid drop in air pressure that is associated with such storms. Assume that the air pressure inside of a sealed house is 1.02 atm when a hurricane hits. The hurricane rapidly decreases the external air pressure to 0.910 atm. A square window in an outside wall of the house measures 2.02 m on each side. What net force (directed outwards) is exerted on this window? (1 atm = 1.01 * 105 Pa.)

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  1. 15 June, 20:58
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    F = 8.25 10⁴ N

    Explanation:

    The definition of pressure is

    P = F / A

    F = P A

    Let's use Newton's second law in the window

    F = F₁ - F₂

    F = P₁ A - P₂ A

    F = (P₁ - P₂) A

    The area of a square window is

    A = L²

    F = (P₁ - P₂) L²

    Let's reduce the magnitudes to the SI system

    P₁ = 1.2 atm (1.01 10⁵ Pa / 1 atm) = 1.212 10⁵ Pa

    P₂ = 0.910 10⁵ atm = 0.9191 10⁵ Pa

    Let's calculate

    F = (1.1212 - 0.9191) 10⁵ 2.02²

    F = 0.8246 10⁵ N

    F = 8.25 10⁴ N
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