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Thermodynamics

Thermodynamics. Image: http://en.wikipedia.org/wiki/Atom_(comics). Energy Super Heroes. Projects due September 24 You must work at home on these. There’s not enough class time. This week: 1. Super power 2. Name & origin story 3. List of concepts your hero can demonstrate.

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Thermodynamics

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  1. Thermodynamics Image: http://en.wikipedia.org/wiki/Atom_(comics)

  2. Energy Super Heroes Projects due September 24 You must work at home on these. There’s not enough class time. This week: 1. Super power 2. Name & origin story 3. List of concepts your hero can demonstrate.

  3. Rubric: Super Hero ProjectWeek 1

  4. Thermodynamics Thermo = heat Dynamics = motion Thermodynamics = the study of heat in motion

  5. First Law of Thermodynamics • “The total increase in the thermal energy of a system is the sum of the work done on it and the heat added to it.” The Atom can reduce his size and mass so as to ride air currents (wind or thermal gradients). How does the First Law of Thermodynamics explain this phenomena? Kakalios, J., The Physics of Superheroes, pp. 132-136

  6. Work? • Jenna, Carl: The product of force and displacement in the direction of the force • Nick: Picking up a book is work • Alex: Pushing a box across the floor is work

  7. Second Law of Thermo • “Natural processes tend to go in a direction that increases the total entropy of the universe.” Entropy is a property of a system, like Temperature. http://www.grc.nasa.gov/WWW/K-12/airplane/thermo2.html

  8. Third Law of Thermo • “As a system approaches absolute zero, all processes cease and the entropy of the system approaches a minimum value.”

  9. Changing State • Vocabulary • Melting point • Heat of fusion • Boiling point • Heat of vaporization (definitions on pages 252-3 in your physics book) Image: http://www.humboldt.edu/~rap1/C107.F05/C107Exams_SG/C107Final_SG.htm

  10. Changing State Image: http://www.humboldt.edu/~rap1/C107.F05/C107Exams_SG/C107Final_SG.htm

  11. Heat Needed to Melt Stuff Q = mHf Image: http://acephalous.typepad.com/acephalous/comics/

  12. Heats of Fusion & Vaporization

  13. Scientific Notation • Which is bigger? • 8.25 x 104 • 1.13 x 105

  14. Food for Thought • Alcohol evaporates quickly. Why? • Iceman (from the XMen) eats a normal diet of about 2500 calories per day, which is about 1.0 x 107 J of energy. How much water at 100°C could that much energy vaporize? Image: http://acephalous.typepad.com/acephalous/comics/

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