The internal combustion engine performed work of 40MJ and at the same time consumed 5kg
September 8, 2021 | education
| 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%.
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