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A uniform rectangular plate is hanging v...

A uniform rectangular plate is hanging vertically downward from a hinge that passes along its left edge. By blowing air at `12 m//s` over the top of the plate only, it is possible to keep the plate in a horizontal position, as illustrated in part (a) of the drawing. To what value of speed should the air be blown so that the plate is kept at a `30^(@)` angle with respect to the vertical, as in part (b) of the drawing ?

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