Fan and Medal!!!!!!!!!!!!!!!!!!! A steam engine absorbs 4 x 105 J and expels 3.5 x 105 J in each cycle. What is its efficiency?

Question

anonymous · Answer

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priyar · Answer

see this video...it clearly explains how to do such problems and the concept in just 3 min.. https://www.youtube.com/watch?v=p-axezzsYR4

farcher · Answer

Efficiency is useful work done (ie energy which is not wasted) divided by the total energy input.  
It will be a number between 0 and 1.  
Sometimes the efficiency is required as a percentage.

priyar · Answer

But remember here the useful energy is (4-3.5)*10^5 since energy expelled as heat is NOT useful energy...that's why we are subtracting..