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A refrigerator is maintained at 5°C by removing heat from the refrigerated space at 18,000 kJ/hr. The power input to the refrigerator is 1500 W and the surrounding air is at 36° C. Determine:
a. The reversible power input, in kW.
b. The rate of irreversibility, in kW.
c. The second-law efficiency of the refrigerator.
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An alternating copolymer is known to have a number-average molecular weight of 100000 g/mol and a degree of polymerization of 2210. If one of the repeat units is ethylene, which of styrene, propylene, tetrafluoroethylene, and vinyl chloride is the ot..
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