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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.
air is compressed in a piston-cylinder device from 90 kpa and 20 degrees c to 400 kpa in a reversible isothermal
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assuming that the diameters of 1000 brass plugs taken consecutively from a machine form a normal distribution with
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Plot the moment about B for 320mm
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an air conditioner operating at steady-state takes in moist air at 27 oc 1 bar and 70 relative humidity. the moist air
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