\"\"

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A vertical plate is submerged in water as indicated in the figure.

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 Find the hydrostatic force  on one end of the aquarium:

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\"\".

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\"\", where \"\" is the depth of the aquarium.

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At any time, the plate is \"\" ft depth from the surface.

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Thus, \"\".

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Strip area of one side of the plate is  \"\", as depth increases then \"\" also increses.

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Thus, consider width as \"\".

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Find the length of the strip.

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Redraw the figure.

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Finding net force on upper half.

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\"\"

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Observe the diagram: