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3. The coefficient of performance of a refrigerator if it is extracts 1200J of heat from the cold reservoir and releases 1800J of heat to

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3. The coefficient of performance of a refrigerator if it is extracts 1200J of heat from the cold reservoir and releases 1800J of heat to the hot reservoir, taking into consideration that the work done is the difference between heat released and heat removed (extract) a) COP=2 b) COP=3 c) COP=0.5 d) COP=1

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