Is This Calculation of Heat Engine Efficiency Correct?

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A heat engine produces 8500 J of heat while performing 2700 J of useful work. What is the efficiency of this engine?

e=W/Q_h =2700 J/8500 J =0.32 or 32%


This just looked way to easy...hoping to have someone double check
 

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Wow, what an easy problem. Thanks for the help
 

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