The internal combustion engine performed work of 40MJ and at the same time consumed 5kg

The internal combustion engine performed work of 40MJ and at the same time consumed 5kg of gasoline. Calculate the efficiency of a motor?

Initial data: A (work done by the internal combustion engine) = 40 MJ = 40 * 10 ^ 6 J; m (mass of consumed gasoline) = 5 kg.

Reference values: q (specific heat of combustion of gasoline) = 4.6 * 10 ^ 7 J / kg.

The efficiency of an internal combustion engine is calculated by the formula: η = Ap / Q * 100% = Ap / (q * m) * 100%.

Let’s make a calculation: η = 40 * 10 ^ 6 / (4.6 * 10 ^ 7 * 5) * 100% = 0.174 * 100% = 17.4%.

Answer: The efficiency of the internal combustion engine is 17.4%.