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Lecture2

# Lecture2 - Physics 7A Lecture 2 Winter 2010 Prof Robin D...

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Physics 7A -- Lecture 2 Winter 2010 Prof. Robin D. Erbacher 343 Phy/Geo Bldg

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This course has two instructors: Prof. Robin Erbacher (me) rderbacher @ucdavis Dr. David Webb (Lead DL Instructor) dewebb @ucdavis You are enrolled in one of two 7A classes. 7A-C/D has lectures on Tuesdays. We are independent courses but cover the same material, so you can attend any review session. We will likely have a common final exam. The final exam is Wed March 17 th , 3:30 pm-5:30 pm If you know you cannot make the final, you should take 7A in a different quarter . There are no make-up exams.
• Join this Class Session with your PRS clicker! • Quiz today! Lecture 1, DLM 1 + FNTs. Must take it in correct lecture time slot. • Check Physics 7 smartsite frequently for calendar & announcements. DL Instructors have PTA numbers for adding this class. No Lecture next week ! • Turn off cell phones during lecture.

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• Three-phase model of matter • Energy-interaction model • Mass-spring oscillator • Particle model of matter Particle model of bond energy Particle model of thermal energy Thermodynamics Ideal gas model Statistical model of thermodynamics We started with these two… We introduce this one next (chapter 2)
3-Phase Model Revisited

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Solid : Keeps its shape without a container. Liquid : Takes the shape of the (bottom of) the container. Keeps its volume the same. Gas : Takes the shape and volume of the container. Example H 2 O
• T bp : Temperature at which a pure substance changes phase from liquid to gas (boiling point). • T mp : Temperature at which a pure substance changes phase from solid to liquid (melting point). T bp T mp

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You take ice out of the freezer at -30 0 C and place it in a sealed container and slowly heat it on the stove. You would find: the temperature of the ice rises, remains fixed at 0 0 C for an extended time while it is a mixture of ice and water, the temperature rises again after it all melted, remains fixed at 100 0 C for an extended time while it is a mixture of liquid and gas, the temperature rises again after it is all gas (steam).
Q How do we change the phase of matter? How do we change the temperature of matter? A By adding or removing energy. In some cases this energy is transferred from, or to, the substance as heat , “ Q ”. Example H 2 O

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Thermal Equilibrium and Heat
An ice-cube sits in a bath of water. Water and ice can exchange heat with each other but not with the environment. What is the direction of heat transfer? A. From ice-cube to water B. From water to ice-cube C. Neither of above D. Impossible to tell 0 0 C Water Ice-cube 0 0 C

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Starting definition of heat (to be revised much later): Heat (Q) is the transfer of energy from a hot object to a cold object because the objects are at different temps.
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