Question #83965
If the fuel consumption of a car, travelling at a steady 60 mph is 20 mpg, what is the power produced by the petrol being burnt in the engine? [Assume that the density of petrol is 0.84 kg/l and the heat of combustion of petrol is 47 302 kJ/kg.
Expert's answer
60 mph=26.67 m/s.
20 mpg=8443.27 m/L.
The volume in 1 second:
V=26.67/8443.27=0.0032 L.
The power produced by the petrol being burnt in the engine:
P=0.0032(0.84)(47302 )=125.5 kW.
