In an engine, fuel and oxygen chemically react and release energy. What happens to the energy NOT used by the engine? A. It has been destroyed. B. It is lost in the form of heat and sound. C. It remains stored in the chemical bonds of the fuel. D. It is converted into methane.
B. It is lost in the form of heat and sound.
The energy not used by the engine is mostly lost in the form of heat and sound. Therefore, the correct answer is B. It is lost in the form of heat and sound.
The correct answer is B. It is lost in the form of heat and sound.
When fuel and oxygen react in an engine combustion process, they release energy in the form of heat. This heat energy is then partially converted into mechanical work, which is used to power the engine and perform useful tasks. However, no engine is 100% efficient, meaning that not all of the energy released by the combustion process is converted into useful work.
Some of the energy is lost as waste heat, which is dissipated into the surrounding environment. This heat loss occurs through various mechanisms, including radiation, conduction, and convection. In addition to heat, some of the energy is also lost as sound, which is produced due to the movement of gases and mechanical components within the engine.
Therefore, although energy is not destroyed in the process, it is not completely used or stored in the chemical bonds of the fuel. Instead, a significant portion of the energy is lost as heat and sound, making option B the correct answer.