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A lab assistant measured the hot reservoir of a heat engine as 212oF and the cold reservoir as 32oF. Then, he used the formula e

A lab assistant measured the hot reservoir of a heat engine as 212oF and the cold reservoir as 32oF. Then, he used the formula e = 1 - Tc / TH to calculate a maximum efficiency. He concluded that it is 85%. Is this correct? If not, find the correct efficiency

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