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Heat flows from a reservoir at 373 K to ...

Heat flows from a reservoir at `373 K` to a reservoir at `273 K` through a copper rod as shown in the figure. The heat then leaves the `273 K` reservoir and enters a Carnot engine, which uses part of this heat to do work and rejects the remainder to a third reservoir at `173 K`. What fraction of the heat leaving the `373 K` reservoir is rendered unavilable for doing work, as compared to the situation where a Carnot engine is connected directly between the `373 K` and `173 K` reservoirs ? ltbr.

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