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Ten grams of computer chips with a specific heat of 0.3 kJ/kg dot K are initially at 15 degrees C. These chips are cooled by placement in 5 grams of saturated liquid R134a at -38 degrees C. Presuming that the pressure remains constant while the chips are being cooled, determine the entropy change of the chips, then determine the entropy change of the R134a and then determine the change of the entropy of the entire system. Is this process possible? Why or why not?
Consider a thermal energy reservoir at 1500 K that can supply heat at a rate of 150,000 kJ h-1. Determine the exergy of this supplied energy, assuming an environmental temperature of 25 oC.
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Why do thermoplastics tend to become brittle in very cold weather?
two tanks are connected by a valve and line as shown below. the volumes are both 1 m3. tank anbspcontains r-134a at
a contact feedwater heater operates on the principle of mixing steam and water. steam enters the heater at 100 psia and
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