Question

One statement of the second law of thermodynamics is that ___________________.

heat can flow spontaneously only from a hot source to a cold source

a heat engine can convert all the heat input to useful work

heat can flow spontaneously from a cold source to a hot source

energy can be created and destroyed

Answer 1

heat can flow spontaneously only from a hot source to a cold source

the second law of thermodynamics says that heat flows naturally from an object at a higher temperature to an object at a lower temperature, and heat doesn’t flow in the opposite direction of its own accord.