A cornot engine in 1000 kilocal of heat from a reservoir at `627^@C` and exhausts it to sink at `27^@C`. What is its efficiency? How much work does it perform?

A cornot engine in 1000 kilocal of heat from a reservoir at `627^@C` a

1.	A cornot engine in 1000 kilocal of heat from a reservoir at `627^@C` and exhausts it to sink at `27^@C`. What is its efficiency? How much work does it perform?
Answer» Given `T_1=627^@C=627+273=900K` `T_2=27^@C=27+273=300K` `Q_1=3000`kcal (a) `eta=1-(T_2)/(T_1)=1-(300)/(900)=(2)/(3)` i.e., `(200)/(3)=66.6%` (b) `(Q_2)/(Q_1)=(T_2)/(T_1)implies(Q_2)/(3000)=(300)/(900)` `Q_2=1000kcal` `W=Q_1-Q_2=3000-1000=2000kcal` `=2000xx10^3xx4.2=8.4xx10^6J`

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A cornot engine in 1000 kilocal of heat from a reservoir at `627^@C` and exhausts it to sink at `27^@C`. What is its efficiency? How much work does it perform?

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