With the heat of the engine, I did useful work 4, 4 * 10 kJ and used up 4 kg of gasoline. Find the efficiency of a heat engine.
To calculate the efficiency of the used heat engine, we apply the formula: η = Ap / Qb = Ap / (qb * m).
Variables and constants: Ap – useful work (Ap = 4.4 * 10 ^ 4 kJ = 4.4 * 10 ^ 7 J); qb – specific heat of combustion of gasoline (qb = 4.6 * 10 ^ 7 J / kg); m is the mass of gasoline (m = 4 kg).
Calculation: η = Ap / (qb * m) = 4.4 * 10 ^ 7 / (4.6 * 10 ^ 7 * 4) = 0.2391 or 23.91%.
Answer: The used heat engine, according to the calculation, has an efficiency of 23.91%.
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