Question

In a combustion engine, fuel is burned to produce mechanical energy. Which of the following shows that an energy transformation has taken place? there is no change, matter is destroyed, heat is produced, or matter is created.

Answer 1

Answer: Heat is produced

Explanation:

From the law of conservation of energy and mass, these cannot be created nor destroyed but can convert from one form to another. When fuel is burnt, heat is produced which changes into mechanical energy ( potential energy + kinetic energy). Thus, chemical energy of the fuel transforms to heat energy which transforms to mechanical energy. This shows that energy transformation has taken place.

Answer 2

Answer:

Heat is produced

Explanation:

In a combustion engine there is a chamber in which the combustion of fuel occurs in the presence of an oxidizer. This combustion generates heat is produced which expands the gases and the gases moves the pistons or rotor present in the chamber. These pistons are then connected with system that moves a vehicle or turbine.

Here the fuel i.e. chemical energy is being converted into heat which is then being converted into mechanical energy. Thus following the law of conservation of energy and mass.