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Lecture 12 new to web

# Lecture 12 new to web - Wednesday February 20 Announcements...

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Wednesday, February 20, Announcements Homework 5 due today Homework 6 (pickup assignment) due March 5 Pickup graded homework and quizzes Today and next Monday Midterm Exam – next week on Wednesday (2/27) Chapters 1 – 9 Bring one page (2-sides) for reference to exam Numerical values of constants are provided Can bring calculator Sample Midterm (hand out today) Solutions (on web next Monday, but try first!) Midterm Review – part of Monday’s class Discussion Sessions (7 – 9 PM, YKK220-001) on Monday and Tuesday evenings Other help – by arrangement (email: TAs, me)

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Electricity and Electrostatics Today’s lesson Finish Heat Flow Intro – Electricity and Magnetism Electrostatic Phenomena Electric Charge Insulators and Conductors Electrostatic Force Electric Field Electric Potential
Review – Heat Flow Heat flows from higher T to lower T (warmer to cooler) Heat rises (hot air balloon) Three types of heat transport: Conduction flow of heat/energy through materials in contact thermal conductivity - property of material (metals, woods, plastics, hand, house insulation) travels through a medium [T Î average K.E. of atoms/molecules] Convection flow of heat or heat transfer via motion of a fluid contains thermal energy (air, water, steam) carried by a medium (energy) Radiation flow of energy by electromagnetic waves (chapter 15) Heat Î infra-red wavelengths (shorter than radio waves - longer than visible light) thermos bottle (vacuum with silvered walls reflects waves) needs no medium

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