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I had a question on a test where a dam was divided into two unequal parts and the question was about the pressure and force.

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I supposed that the area of the water in the X section is higher hence the pressure must be lower, but the actual answer is A. Why is that?

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    $\begingroup$ This is not a cross section, it's a top down view. Section X is not "higher". $\endgroup$
    – knzhou
    Commented Mar 8, 2018 at 11:02

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The greater volume of water that is directly against the section will cancel out with the greater area - hence the two pressures will be the same.

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Pressure in a fluid at the same levels are equal, hence pressure at the two sections are equal.

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