contestada

A car traveling on a level road initially has 440 kJ of mechanical energy. After the brakes are applied for a few seconds, the car has only 110 kJ of mechanical energy. What best accounts for the missing mechanical energy? In other words, where did that missing energy go?

Respuesta :

mavila18

Answer:

The missing mechanical energy becomes thermal energy in form of heat transferred to the medium (air and ground)

Explanation:

When the car applies the brakes, the friction between wheels and highway generates heat. This heat is transmitted to the air and to the ground.

Then, part of the mechanical energy of the car becomes thermal energy in form of heat.

The car, at the beginning has a energy of 440kJ, after the brakes are applied, the car has 110 kJ of energy. This means that necessarily the car loos 330 kJ of energy that became heat to the medium (air and ground)

Histrionicus

The missing energy in this case, is - transfer to thermal energy in form of heat transferred to the medium

In this case, the mechanical energy is converted into heat due to work done against friction which leads to kinetic energy is being reduced, Potential energy of the system remains the same because the road is level, so the mechanical energy of the system is only kinetic energy.

  • This change is a result of the conversion of energy.
  • The energy of the car system converted the mechanical energy in it, into corresponding heat energy.
  • During the course of this conversion, is where a transfer of 330 kJ of energy in the form of heat through various mediums; air and ground.
  • The 330 kJ of energy was lost as a result of the conversion of mechanical energy into heat energy by the use of friction.

Thus, the missing energy in this case, is - transfer to thermal energy in form of heat transferred to the medium

Learn more:

https://brainly.com/question/1424758

Otras preguntas