physics......PLEASE HELP!!

A steam engine absorbs 1.98*10^5 J and expels 1.49*10^5 J in each cycle. Assume that all of the remaining energy is used to do work.

a. What is the engine's efficiency?
b. How much work is done in each cycle?

If a gasoline engine has an efficiency of 21 percent and loses 780 J to the cooling system and exhaust during each cycle, how much work is done by the engine?

Efficiency= useful work/inputwork * 100



.21 Input work= 780J
solve for input work
thenuseful work= .79*input work

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  1. the first one the answer for a is 25% and for b is 4.9 x 10^4 J.

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