Thermodynamics Image http en wikipedia orgwikiAtomcomics Energy Super

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.

Rubric: Super Hero Project Week 1 Objective Value Hero is original 25 Super power relevant to our topic 25 Hero has a name and identity 25 List of concepts your hero can demonstrate (ie, what physics will you be showing? ) 25

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

First Law of Thermodynamics • “The total increase in 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

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

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/thermo 2. html

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

Changing State • Vocabulary – Melting point – Heat of fusion – Boiling point – Heat of vaporization (definitions on pages 2523 in your physics book) Image: http: //www. humboldt. edu/~rap 1/C 107. F 05/C 107 Exams_SG/C 107 Final_SG. htm

Changing State Image: http: //www. humboldt. edu/~rap 1/C 107. F 05/C 107 Exams_SG/C 107 Final_SG. htm

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

Heats of Fusion & Vaporization Material Heat of fusion Hf (J/kg) Heat of vaporization Hv (J/kg) Copper 2. 05 x 105 5. 07 x 106 Gold 6. 30 x 104 1. 64 x 106 Mercury 1. 15 x 104 2. 72 x 105 Methanol 1. 09 x 105 8. 78 x 105 Water 3. 34 x 105 2. 26 x 106

Scientific Notation • Which is bigger? – 8. 25 x 104 – 1. 13 x 105

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/