Question

In a practical machine, the power output is smaller than the power input. Considering the law of energy conservation, what can explain this occurrence? A. Some of the energy going into the machine is being destroyed. B. Some of the energy is used to combat friction, and thus is transformed from mechanical energy to heat. C. Some of the energy going into the machine is being created at a quicker rate than the energy coming out is being destroyed. D. Some of the energy coming out of the machine is being destroyed.

Answer 1

i think it is b because of what i was and am being taught

Answer 2

I believe the answer is B, since what I was taught is that the reason the input is not the same is because energy gets wasted on other forms of outputs, such as heat, sounds, whatever your device isn’t meant to do.