1) use energy from food
2) get rid of wastes
3) maintain
A machine can never be 100% efficient because some work is always lost
due to the lack of materials or equipment that would convert work by 100%. It follows
the second law of entropy. The ideal engine is known as Carnot’s engine having
a 100% efficiency. So far, no engine has ever gotten to 100%.
Answer:
negative
Explanation:
positive charges attract negative charges and vice versa. and are possible to nullify
