Question

is any machine 100% efficient? yes no

Explanation:

In reality, no machine can be 100% efficient. This is because of the second law of thermodynamics. According to this law, when energy is converted from one form to another (which is what machines do), some energy is always lost as waste heat. For example, an engine in a machine like the excavator in the picture burns fuel (chemical energy) to do work (mechanical energy), but a significant amount of the energy from the fuel is lost as heat (which is why engines get hot). This loss of energy means that the output work (useful energy) is always less than the input energy. So, no machine can achieve 100% efficiency.

Answer:

no