Lesson: Entropy and the Second and Third Laws of Thermodynamics High School Physics

Physics

In this lesson, we will learn how to calculate the entropy of systems and the entropy change of systems that transfer internal energy to each other.

Worksheet

Q1:

Which of the following statements correctly expresses the relationship between the work done by a heat engine, , and the internal energy lost by the heat engine’s high-temperature reservoir, ?

Q2:

At what constant temperature is a gas maintained at if the gas increases its internal energy by 45 kJ and its entropy increases by 125 J/K?

Q3:

Work done on an object can heat the object by dissipation. A heat engine can use heating of an object to do work.

When work is done on an object, what is the lowest number of joules dissipated per joule of work done?

When work is done on an object, what is the greatest number of joules dissipated per joule of work done?

For a heat engine that has the highest possible efficiency for a heat engine, what is the lowest number of joules of work per joule of input heating that the heat engine cannot output?

When a heat engine operates, what is the greatest number of joules of work done that cannot be supplied per joule of heating?

Which of the following changes in the net entropy of the systems involved in energy transfers, including energy transfers from the systems to their surroundings, can occur?

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