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A tank with a square base of area 1.0m^(...

A tank with a square base of area `1.0m^(2)` is divided by a vertical partition in the middle. The bottom of the partition has a small-hinged door of area `20cm^(2)`. The tank is filled with water in one compartment, and an acid (of relative density 1.7) in the other, both to a height of 4.0 m. Compute the force necessary to keep the door closed.

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The correct Answer is:
55 N
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