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Q)

The water pressure in a lake behind a dam depends on

$\begin{array}{1 1} \text{A.the volume of lake water behind the dam.} \\ \text{ B.the surface area of the lake.} \\ \text{ C.the distance from the dam at which the pressure is measured.} \\ \text{ D.the depth below the surface at which the pressure is measured.} \end{array}$

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A)
The water pressure in a lake behind a dam depends on the depth below the surface at which the pressure is measured.The average water pressure acting against the dam depends on the average depth of the water and not on the volume of water held back. Liquid pressure is the same for any given depth below the surface, regardless of the shape of the containing vessel. Thus the force depends only on the water's average depth and the dimensions of the dam, not on the horizontal extent of the reservoir.
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