A Carnot's engine whose low temperature reservoir is at 7°C has an efficiency 50%. By how many degrees should the temperature of the high temperature reservoir be increased to increase the efficiency to 70%?

To determine the temperature increase needed to achieve a desired efficiency in a Carnot engine, we can use the Carnot efficiency formula and relate it to temperature.

The Carnot efficiency (\(η\)) is given by the equation:

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