# Energy & Entropy

### Course Credits

PH 423: Paradigms in Physics: Energy & Entropy meets 7 hours per week (MWF for 1 hour, TR for 2 hours) for five weeks for a total of 3 credits.

Prereq: PH 213

### Office Hours

 Davide Lazzati Weniger 313 davide.lazzati@oregonstate.edu Wed & Fri 11am-noon in 304F Corinne Manogue Wngr 495 corinne@oregonstate.edu Open Office: If you can find me and I'm not talking to someone else, ask if I'm available! Mike Vignal vignalm@oregonstate.edu Wed & Fri 2-3pm in 304F John Waczak waczakj@oregonstate.edu Wed noon-1pm, Thurs 3-4pm in 304F

### Learning Resources

A complete list of required texts and other resources for the the entire year of Paradigms courses can be found on the Paradigms website. For this course, no text is required.

### Course Content

The "Energy & Entropy" course provides an introduction into thermal and statistical physics. Historically these fields are called thermodynamics and statistical mechanics. Thermodynamics is a phenomenological theory of temperature and heat. It provides a description of properties of macroscopic systems in thermal equilibrium. Starting from only a few laws and a new concept, entropy, thermodynamics provides deep insight into many physical systems:

• First law: energy is conserved, provided we include energy transfer by working and heating.
• A change in entropy is experimentally found by measuring heat in a reversible process and dividing by temperature.
• Second law: we can distinguish between possible and impossible processes by checking whether the entropy of the system plus its surroundings increases or decreases.

Statistical mechanics allows us to to derive the results of thermodynamics from the microscopic laws of physics.

### Student Learning Outcomes

Students shall be able to:

• Characterize and distinguish between different types of thermodynamic processes.
• Analyze thermodynamic processes and calculate the change in state variables.
• Know about and determine the efficiency of idealized engines, refridgerators and heat pumps.
• Use the laws of statistical mechanics to calculate thermodynamic variables for simple systems with known microstates.

### Evaluation of Student Performance

• 50% required Homework and other assignments.
• 10% Quizzes - Tuesdays in class
• 40% Exam (Thursday, December 6, noon-2pm, Wngr 212).
• Practice problems provide simple examples for you to check whether or not you understand the material as you go along.  They will not be graded.  Sometimes solutions will be posted.  At a minimum, you should read each practice problem and make sure that you know how to do it. If you can't, ask for help!
• Required problems will be graded.  Solutions will be posted online.  Assignments turned in after solutions are posted can earn at most 50% of the total points.  Very late assignments will earn less.  It is a good idea to turn in what you have done by the due date, and, if necessary, the rest later. Please consult the instructor for special circumstances.
• In 400/500 level classes, some of the required problems and probably one problem on the final exam will be marked as "Challenge" problems.   500-level students are required to do these Challenge problems.  400-level students are not necessarily expected to do them.  However, those students who hope to get an A are encouraged to do so.  While it may be possible for a 400-level student to get an A without doing any Challenge problems, it may be difficult.  (In PH 320, they are optional and don't count for anything--just fun.) Grading of the Challenge problems will be quite strict; we won't even look at them unless they seem to be clearly written, coherent, complete, and essentially correct.

### Statement of Expectations for Student Conduct

Students will be expected to abide by all university rules regarding student conduct and academic honesty, in particular, see: link to University Rules.