A Carnot engine whose hot-reservoir temperature is 420 ∘C has a thermal efficiency of 40 %. By how many degrees should t

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A Carnot engine whose hot-reservoir temperature is 420 ∘C has a thermal efficiency of 40 %. By how many degrees should t

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A Carnot engine whose hot-reservoir temperatureis 420 ∘C has a thermal efficiencyof 40 %. By how many degrees should the temperatureof the cold reservoir be decreased to raise the engine's efficiencyto 58 %?
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