A stream engine delivers `5.4xx10^(8)J` of work per minute and absorbs `3.6xx10^(9)J` of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

Explanation

Work done by the steam engine per minute, `W=5.4xx10^(8)J`
Heat supplied from the boiler, `H=3.6xx10^(9)J`
Efficiency of the engine `=("Output energy")/("Input energy")`
`thereforeeta=(W)/(H)=(5.4xx10^(8))/(3.6xx10^(9))=0.15`
Hence, the percentage efficiency of the engine is 15 `%`.
Amount of heat wasted `=3.6xx10^(9)-5.4xx10^(8)`
`=30.6xx10^(8)=3.06xx10^(9)J`
Therefore, the amount of heat wasted per minute is `3.06xx10^(9)J.`