Physics, 22.06.2019 21:00 brittneys55

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%


Answer from: mathk3

b. 20%


Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.


η is efficiency, Q₁ is the energy intake, Q₂ is energy wasted.

The information provided is:

Energy intake = 400 J

Work done = 80 J = (400-320) =Q₁-Q₂

Energy wasted =320 J

η= 80/400×100%


Answer from: mem8163

B.20 %


Answer from: Quest

i would like to make dinner for my mom, dad, and sister

Answer from: Quest

massxgravity x heght=weightxheight= pe



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