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A refrigerator takes in 20.0 J of work and exhausts 50.0 J of heat. What is...

A refrigerator takes in 20.0 J of work and exhausts 50.0 J of heat. What is its coefficient of performance? (b) If this refrigerator operates between 275. K and 300. K, what is the maximum COP? Is this a realistic system? Explain why or why not.

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