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During an experiment conducted in a room at 25°C, a laboratory assistant measures that a refrigerator that draws 2 kW of power has removed 30,000 kJ of heat from the refrigerated space, which is maintained at -30°C. The running time of the refrigerator during the experiment was 20 min. Determine if these measurements are reasonable.
an ideal brayton cycle with pressure ratio of 8.95 and air enters the compressor at 285k. find the amount of work in
Refrigerant-134a is throttled from saturated liquid state at 7 bar to a pressure of 1.4 bar. Determine the temperature drop during this process and the final specific volume.
a heat pump has a second law efficiency of of 74. it supplies heat to a room at a rate of 46000 btuhr in order to
a load of 500 pounds is placed on a cylinder of 1040 carbon steel with a 2 inch radius. calculate the stress in
Determine the forces in members DE, DJ, and IJ using the method of sections. I have 5 upper horizontal members; AB, BC, CD, DE, and EF all 3ft apart. A total of 15ft. A pin is at member EF at F. FK is the vertical member connected to a roller at K. M..
at a given instant in time flywheel oa is caused to rotate with angular velocity of w2radsec and angular acceleration o
An internally reversible heat engine has a thermal efficiency of 60 percent, with 600 kJ/cycle of heat transfer added at a temperature of 447 C. Calculate the heat-rejection temperature, in degrees Celsius, and the heat transfer rejected, in kJ/cycle..
Ten pounds-mass of R-22 is at an initial volume of 4.059 ft3 and pressure of 200 psia. It is compressed isobaric ally until its volume is two-thirds of its initial volume. The piston is then held in place as the refrigerant cools until its temperatur..
a cylindrical pipe with inner and outer radii of 1.0 m and 1.1 m respectively is comprised of a material such that the
If the critical resolved shear stress is 10 MPa, what is the yield strength?
a simple torsion-bar spring has the shear stress in the steel g 80gpa shaft is not to exceed 90 mpa and the vertical
suppose because of random variations introduced during fabrication the links of a chain have a random strength whereby
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