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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs
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Does the second law of thermodynamics alter the

Chapter 15, Problem 22

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QUESTION:

Problem 22CQ

Does the second law of thermodynamics alter the conservation of energy principle?

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QUESTION:

Problem 22CQ

Does the second law of thermodynamics alter the conservation of energy principle?

ANSWER:

Problem 22CQ

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The conservation of energy means that energy can neither be created nor be destroyed. It can only be transferred from one form to another.

According to the second law of thermodynamics, it is impossible to construct engine which have 100% efficiency

This actually means that the energy obtained from a source (such as heat energy from a reservoir) can’t be completely converted to effective work and there is always a reduction in the work done. This may cause confusion as of the violation of the conservation of energy.

However, upon close examination, the total energy taken from the source is actually equal to the work done plus the energy given back to the sink, which satisfies and not violate the conservation of energy.

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