A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface.
How much force must a boy apply to the hole with his thumb to stop the leak?

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  1. pressure = rho g h
    = 1000 kg/m^3 * 9.81 * 1.2

    Force = pressure * area
    = 1000 * 9.81 *1.2 * .8 /(10,000)

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