Acertain gasoline engine has an efficiency of 30%; that is, it converts into useful work 30% of the heat generated by burning a fuel. if the engine consumes 0.80 l/h of a gasoline with a heating value of 3.25 times 10^4 kj/l, how much power does it provide? express the answer both in kw and horsepower. suppose the fuel is changed to include 10% ethanol by volume. the heating value of ethanol is approximately 2.34 times 10^4 kj/l and volumes of gasoline and ethanol may be assumed additive. at what rate (l/h) docs the fuel mixture have to be consumed to produce the same power as gasoline?