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Lecture 16: Thermal Energy and Solids
October 24, 2017
- Read: Supplementary Reading CH 6
- Study: Box on p. 120; Figs 6.1, 6.3, 6.5; Eq 6.21; Ex 2; box on p. 131; box on p. 133; Eqs 6.28, 6.29; Exs 3, 4.
- (Continuing objective) Be able to relate concepts of thermodynamics and statistical mechanics to “everyday” situations and to discuss various applications of the concepts to practical problems in various fields of science, medicine and engineering.
- For a molecular system, be able to explain what thermal energy is.
- Given the molecular weight, density, and Young's modulus of a solid, derive the appropriate mass, equilibrium length, and spring constant of the ball-spring model. Use the ball-spring model to describe properties of a solid, including its molar specific head and speed of sound.
- Given two substances, know that thermal energy flows from hot (larger temperature) to cold (smaller temperature) objects. Be able to quantitatively relate the heat flow to a temperature change.
- Use the First Law of Thermodynamics to relate work done on or by a substance, heat flow into or out of the substance, and change in the thermal energy of that substance.
- Wednesday's Assigned Problems: Supp CH 6: 1, 2, 3, 4, 5, 7, 9, 15, 17, 19
- Monday's Hand-In Problems: A48; Supp CH 6: 12, 13, 14, 16, 18; Supp CH 7: 8, 9, 10, 14
- Click here for the Lecture overheads
or here for full-size version.
Answers to conceptests: (1) 1; (2) 2; (3) 3
- Interactive Molecular Dynamics, written by Daniel Schroeder, Weber State.
- On-line Periodic Table of the Elements
- Full-size version of PHYS 211 spelled with tiny hebagoes
Videos of example problemsFirst, some videos made using the tablet:
- Quick example of how to figure out mass of an atom of an element from the Periodic Table.
- An example involving thermal energy, added heat and the Equipartition Theorem. Note: this example starts off looking like it will be very difficult, but you'll see that the Equipartition Theorem makes it quite easy.
- Video Example #1: Determing the ball-spring parameters and the speed of sound for gold.
- Video Example #2: Determining the final temperature and the thermal energy transferred between a hot object and a cold object.
- My Brain is Like a Sieve, by Thomas Dolby
- Mat' Ya Odinok, by Kukuruza
- My Mind's Got a Mind of Its Own, by Jimmie Dale Gilmore
- Major Tom (Coming HOme), by Peter Schilling
- My Shot, by Original Cast of Hamilton
- My Type, by Saint Motel