What is the efficiency of an engine that does 20 j of work and exhausts 80 j of heat while taking in 100 j of heat? use e= wtotal/ qin a. 80% b. 10% c. 20% d. 25% ( need answer asap)

Engine's efficiency is the ratio of the work done by the engine and heat absorbed by it.  The efficiency of the given engine is 20%.

Where,

- efficiency

= work done by engine = 20J

- energy absorbed by engine  = 100 J

Put the values in the formula,

Therefore, the efficiency of the given engine is 20%.

To know more about the efficiency of engine:

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Efficiency =

(energy coming out that does what you want)

divided by

(total energy you put in).

= = = = = = = = = =

Efficiency = (20 J) / (100 J)

Efficiency = 20/100

Efficiency = 0.20

Efficiency = 20%  (C)

measure their densities same density, same sub