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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 cools an electronics compartment by entering at 60 f and leaving at 105 f. the pressure is essentially constant at
steam at 3mpa and 700 degrees c is available at one location in an industrial plant. at another location steam at 2mpa
a circular shaft of diameter d rotates at a speed n and is supported by a journey bearing with clearance c. the
an amusement park at the bottom of niagara falls wants to install a water turbine to produce 100 kw power. water assume
the 8lb ball a is released from rest 10ft height see figure. at the end of the travel ball will impact a 6lb plate b.
a household refrigerator that has a power input of 80w assume constant work input over time and a coefficient of
describe the basics of the carnot cycle of thermodynamics and its application to heat engines such as diesel engines
refrigerant r-22 enters a constant diameter pipe at a pressure of 10 bar a temperature of 20degc and a velocity of 2.20
a car is traveling in a horizontal plane along a curved banked road at a constant speed v. determine the range of
what would be the formula to find out weld pressure adjustments when atm inside the tube is changed?
the hot-water needs of a household are met by a 60-l electric water heater whose heaters are rated at 1.6 kw. the
Air at 90 kpa and -7 C enters an adiabatic diffuser steadily with a velocity of 180 m/s and leaves with a low velocity at a pressure of 100 kpa. The exit area of the diffuser is 5 times the inlet area. Determine (a) the exit temperature and (b) th..
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