A waterfall includes a section where the water drops through a vertical distance of 622 m. If the water crests the top of the falls with negligible
speed, how fast would it be traveling at the bottom if air resistance and
other frictional forces were negligible?

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If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

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