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It is desired to produce refrigeration at -25F. A heat source is available at 500F and the ambient temperature is 80F. A heat engine can produce produce work operating between the 500-F source and the ambient surroundings. This work in turn can be used to drive the refrigerator. Assuming all processes are reversible, determine the ratio of the heat transfer from the source to the heat transfer from the refrigerated space.
at the beginning of the compression process of an air-standard otto cycle p1 14.7 lbin2 and t1 530degr. the maximum
a thin metal plate is insulated on the back and exposed to solar radiation on the front surface. the exposed surface of
a heat engine whose thermal efficiency is 40 percent uses a hot reservoir at 700 k and a cold reservoir at 280 k. a
nitrogen r0.2968 kjkg-k cv 0.745 kjkg-k at 100 kpa is contained in an insulated piston cylinder device as shown in the
Mainframe computing used to be the only way to manage enterprise data. Then personal computers changed the data management scene. How do these two computing styles differ, and how did shift to PC-based computing evolve.
a 700 kg automobile is traveling at 30 msec when it suddenly applies its breaks and lock the wheels. when this happens
consider a hollow steel sphere of inside radius r110 cm and outside radius of r220 cm. the thermal conductivity of the
a first class lever in static equilibrium has a 50lb resistance force and 15lb effort force. the levers effort force is
fe transforms from a bcc to fcc crystal structure at around 911 degrees c. fcc fe has an atomic radius .129 nm. what is
a steam power plant has high and low pressures of 20 mpa and 10 kpa respectively and one open fwh operating at 1 mpa
How will notches and holes affect the deflection of a cantilever beam? ie. increase or decrease? (Please provide citations)
In a DC planar magnetron sputtering system at 1000 V, the cathodeanode spacing is 10 cm. What magnetic field should be applied to trap electrons within 0.5 cm of the target?
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