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Unformatted text preview: below the curved surface. It turns out that for cylindrical surfaces (a circular arc shape), the resultant hydrostatic force acting on the surface always passes through the center of the circular arc. We take the moment about point A , using counterclockwise as positive. As shown in the sketch to the right, there are only two moments acting about point A : (1) the weight of the cylinder times its moment arm, which is the radius of the cylinder, and (2) the net hydrostatic force acting on the portion of the cylinder that is in contact with the water times its moment arm. Its force is F R and its moment arm R sin which is the perpendi distance from A to the line of action of the force. W cyl A F R R R sin is cular...
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 Fall '05
 CIMBALA

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