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An engineering student considers using a fan as a levitation demonstation. She plans to face the box-enclosed fanso the air blast is directed face down through a 3 ft diameter blade span area. The system weighs 5 lbf, and the student will secure the system from rotating. By increasing the power to the fan, she plans to increase the blade rpm and air exit velocity until the exhaust provides sufficient upward force to cause the box fan to hover in the air. Determine (a) the air exit velocity to produce 5 lbf (b) the volumetric flow rate needed and (c) the minimum mechanical power that must be supplied to the airstream. Take the air density to be .081 lbm/ft^3.
sketch the root locus for teh characteristic equations of the system for whichls s2 ss1s5and determine the value of
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a fire hose nozzle has a diameter of 1.375 in. according to some fire codes the nozzle must be capable of delivering at
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