Question

One statement of the second law of thermodynamics is that ___________. heat can flow spontaneously only...

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

heat can flow spontaneously only from a hot source to a cold source
It is possible to convert energy from one form to another without loss
heat can flow spontaneously from a cold source to a hot source
It is possible to convert heat entirely into useful work
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Answer #1

Heat can flow spontaneously from hot to cold source without the influence of an external source. This is approximately a version of the second law which states heat can never pass froma colder to a hotter body without the intervension of a process that occurs simultaneously.

Thus based on this, the third option is wrong. Also, according to another statement of 2nd law, heat cannot be completely converted to work. This makes the last and the 2nd statement also wrong.

Thus answer is the first option.

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