The heat output of a particular engine is 7.5 x 103J per cycle, and the net work
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(a) The heat input is (1) less than 4.0 x 103 J, (2) between and 4.0 x 103 J and 7.5 x 103 J, (3) greater than 7.5 x 103 J. Explain.
(b) What is the heat input and thermal efficiency of the engine?
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