Question: How much work must be done by a Carnot refrigerator to transfer 1.0 J as heat? (a) From a reservoir at7.0 o C to one

How much work must be done by a Carnot refrigerator to transfer 1.0 J as heat? 

(a) From a reservoir at7.0oC to one at 27oC, 

(b) From a reservoir at -73oC to one at27oC, 

(c) From a reservoir at -173oC to one at27oC, and 

(d) From a reservoir at – 223oC to one at27oC?

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