An internal combustion engine burns 1 kg of gasoline. During this time, he performed work

An internal combustion engine burns 1 kg of gasoline. During this time, he performed work equal to 13.8 · 10 ^ 6 J. What is the efficiency of the engine?

Internal combustion engine efficiency:

η = (A / Q) * 100%, where A is the useful work of the engine (A = 13.8 * 10 ^ 6 J), Q is the energy expended from the combustion of gasoline (Q = q * m, where q is specific heat of combustion of gasoline (q = 44 MJ = 44 * 10 ^ 6 J / kg), m is the mass of consumed gasoline (m = 1 kg)).

Let’s calculate the efficiency of an internal combustion engine:

η = A / (q * m) * 100% = 13.8 * 10 ^ 6 / (44 * 10 ^ 6 * 1) * 100% ≈ 30%.

Answer: V. The efficiency of the internal combustion engine is 30%.