Question

An engine absorbs 2150 J as heat from a hot reservoir and gives off 750 J as heat to a cold reservoir during each cycle. What is the efficiency of the engine?

Answer 1

    Input =  2,150 J; Output = 750 J 
    The efficiency of the engine = Output / Input = 750 J / 2,15 J = 0.3488
    Answer:  0.3488 or 34.88 %