Question

the second law of thermodynamics tells us that when energy changes forms, what happens? some of it is lost, usually as heat. it is created out of nothing. it increases with each transformation.

Explanation:

The second law of thermodynamics states that during energy transformations, energy is not 100% efficient. Some energy is dissipated, often as heat, due to the increase in entropy (disorder) in a closed system. The option "It is created out of nothing" violates the law of conservation of energy. The option "It increases with each transformation" is also incorrect as energy transformations are not 100% efficient and energy doesn't increase during transformation (it can be lost as heat or other non - useful forms). So the correct option is the one stating that some of it is lost, usually as heat.

Answer:

Some of it is lost, usually as heat.