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A desktop computer is to be cooled by a fan whose flow rate is 0.34 m3 /min. Determine:
a) the mass flow rate of air through the fan at an elevation on 3400 m, where the air density is 0.7 kg/m3 .
b) the diameter of the casing of the fan, if the average velocity of air is not to exceed 110 m/min.
one kg steam with a quality of 0.2 is heated in a pistoncylinder vessel at a constant pressure of 200 kpa unit the
atmospheric air at 10 psia and 70 f dry bulb has a relative humidity of 50. if the air is sensibly heated at a
A rigid tank initially contains 3 kg of saturated water vapor at 140°C. Heat transfer occurs, and the pressure drops to 200 kPa. Assume that kinetic and potential energies are negligible. Determine the amount of energy transfer by heat, in kJ.
A cylindrical specimen of a metal alloy 48.0 mm long and 9.72 mm in diameter is stressed in tension. A true stress of 368 MPa causes the specimen to plastically elongate to a length of 53.5 mm.
The cost of operating a large ship (CO) varies as the square of its velocity (v); specifically, CO = knv2 , where n is the trip length in miles and k is a constant of proportionality. It is known that at 12 miles/hour, the average cost of operation i..
a bar of solid circular cross section is loaded in tension by forces p. the bar has length l16in and diameter 0.50in.
the link DE is 3mm thick and 25 mm width,determine the normal stress in the central portion of the link.
Water at 40 kPa and 70°C goes through an isentropic compression which raises its pressure to 3 MPa. Then at constant pressure it is superheated 200°C. Determine the enthalpy change for each of the two processes.
a dish of liquid water is placed on a table in a room. after a while all of the water evaporates. taking the water and
a rigid tank is connected by a valve to a supply line where refrigerant at 1.4 mpa and 100 degrees celsius flows
what is the difference between steady state and non-steady state diffusion processes? use mathematical expressions to
a piston-cylinder device contains 1.0kg of air which undergoes a reversible process where pv1.33const. the initial
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