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Using the Kelvin-Planck statement of the second law of thermodynamics, demonstrate the following corollary. The coefficient of performance of an irreversible refrigeration cycle is always less that the coefficient of performance of a reversible refrigeration cycle when both exchange energy by heat transfer with the same two reservoirs.
methane at 1 mpa 300 k is throttled through a valve to 100 kpa. assume no change in kinetic energy and ideal gas
many bridge designs today contain simple geometrical components but are constructed into complex ways to ensure that
u.s. energy use was approximately 100 quads quadrillion btu in 2008. about 85 of this energy was supplied by burning
a 4 ft concrete post is reinforced with four steel bars each with a 34 diameter. knowing that es 29 x 106 psi and ec
a gearbox is needed for an input shaft that rotates at 1000-1600 rpm and an output shaft that rotates at 75 plusmn1 and
What is the difference between corrosion and stress corrosion cracking of pipelines? Which of them is more dangerous and why?
for an iron-carbon alloy of eutectoid composition 0.76 wt carbon what is the required time at 675 degrees celsious to
a piston-cylinder device contains 1m3 liquid water of saturated liquid water at 200 c. the water is expanded
a large food-processing plant requires 1.5 lbms of saturated or slightly superheated steam at 140 psia which is
a water drop of radius r1mm at ambient conditions 27c and 1atm is used to cool a computer chips hot spot. the chip is
if the volume of a bucketful of water is described by the normal distribution with a mean of 2.7 gallons and a standard
stainless steel type 304 having a density 7.86 gmcm3 has been used in some reactors. the nominal composition by weight
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