Assuming an engine operates as a reversible heat engine calculate the outlet temperature (temperature of rejected heat) that achieves a thermal efficiency of 63% if the engine takes in heat at 640°c .

Explanation:

The efficiency of a reversible heat engine is given by:

where

Tc is the cold temperature (outlet temperature)

Th is the hot temperature (temperature of the source)

In this problem, we know:

So, we can calculate the outlet temperature by re-arranging the formula:

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