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A scientist needs a refrigeration machin...

A scientist needs a refrigeration machine to maintain temperature of `-13^(@)C` for certain chemical process. How much work must be performed on the system during each cycle of its operation if `3000 J` of heat is to be withdrawn from the `-13^(@)C` reservoir and discharged to the room at `+27^(@)C`? Assume that the machine operates at `100 %` of its theoretical efficiency.

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