A thermal engine has an efficiency of 0.2. What does it mean?

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A thermal engine has an efficiency of 0.2. What does it mean?

(a) That in each cycle the machine performs a work of

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(d) That for every Joule of work performed, the machine absorbs a heat of

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(c) That for every Joule of heat absorbed, the machine performs a work of

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(e) That for every Joule of work performed, the machine gives off a heat of

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(b) That in one second the machine performs a work of

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