Question

Heat is supplied to an engine at the rate of 10^(6)J minute ^(-1) and the engine has an output of 10 horsepower.What is the efficiency of the engine and what is the heat output per minute?

Answer 1

Answer

Heat supplied

Q$_1=10^6J/min$

W=10$\times 746\times60=447600J/min$

So effeciency

$\eta=\frac{W}{Q_1}=\frac{447600}{10^6}=45$ %

heat output per minute

$Q_2=Q_1-W=1000000-447600=552400J/min$