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An engineering student considers using a fan as a levitation demonstration. She plans to face the box-enclosed fan so the air blast is directed face down through a 3-ft-diameter blade span area. The system weighs 5lbf, 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 5lbf 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 .078 lbm/ft^3.
an adiabatic pump operating at steady state compresses liquid water from an initial condition of 10 bar and 40degc to a
A body with a plane stress field has material properties E, ν and has the following displacement field
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some of our modern kitcgen cookware is made of ceramic materials. a compare the relative properties and cost of three
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Important information about Pressure Cooker, Steam is leaving a pressure cooker whose operating pressure is 30 psi. It is observed that the amount of liquid in the cooker has decreased by 0.4 gal in 45 minutes after the steady operating conditions..
a close rigid tanks with a volume of 2 m3 contain hydrogen gas initially at 320 k and 180 kpa. heat transfer from a
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