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A carnot engine works between two heat reservoirs at

A Carnot engine works between two heat reservoirs at temperatures Th = 330 K and Tc = 180 K.

(a) What is its efficiency?

______________%

(b) If it absorbs 90 J from the hot reservoir during each cycle, how much work does it do?

_____________J

(d) What is the COP of this engine when it works as a refrigerator between the same two reservoirs?

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