(a) Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 23.2 m. Assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kPa.

(b) What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 33.1 cm?

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  1. a)
    Density of H2O = 1E^3 = 1000kg/m^3
    Pair = 101.3 = 101300 Pa

    Pwater = (Density of H2O)*Depth*gravity

    Ptotal = Pair + Pwater

    diameter = 33.1cm
    r = 1/2 diameter
    Area = pi*r^2

    Force = Ptotal * Area

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  2. asa

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  3. a.) 116kpa
    b.) 52 Pa

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