Physics ch 4 #11/2

Question

A heat engine does 30 J of work per cycle while exhausting 50 J of waste heat.

What is the engine's thermal efficiency?

Answer 1

Of the total heat 30 + 50 = 80 J, 30 J s converted into work

=> thermal efficiency

= 30/80 x 100 percent

= 37.5 percent.