Question

46 multiple choice 2 points
why are energy conversions never 100% efficient, as mentioned in the text?
because energy is constant and unchanging.
because some energy always escapes as waste heat.
because energy is destroyed during conversions.
because energy cannot be changed into different forms.
clear my selection

Explanation:

According to the second law of thermodynamics, when energy is converted from one form to another, some of it is always lost as waste heat. Energy is neither created nor destroyed (so options about energy being destroyed or unchanging are incorrect), and energy can be changed into different forms (so that option is wrong too).

Answer:

Because some energy always escapes as waste heat.