1. Phys 150 Lecture 31 Please sit together in pairs: –Onyema and Honglu –Alejandra and Matt –Chris and Lin –Ryan and Anwen –John F. and Mengyue –Walter and Melissa –Max and Zhongyun –Amanda and Kaijun –Pauline and Erich –Jake and Irfan –John W. and Jason –Jennifer and Jiayuan –Alexandra and Erica –David and Dian –Abigael and Michael

2. Phys 150 Lecture 42 Announcements Homework 2 is due on Sunday at midnight. Quiz on Chapter 2 on Tuesday. Quiz 1 solution is available on web page. Homework 1 solution is available on web page Suggestion: Do the Homework 3 multiple- choice questions before coming to class on Tuesday. Also look at questions at end of Chapter 2.

3. Phys 150 Lecture 43 Announcements I will drop your lowest homework and your lowest quiz scores at the end of the semester.

4. Phys 150 Lecture 44

5. Phys 150 Lecture 35 Cost of energy Coal ($46/ton, IL)0.8¢---- Natural gas ($3.50/MMBtu)1.2¢3.2¢ Gasoline($3.29/gal)10¢---- Electricity10¢10¢ Coal and natural gas are about 33% efficient for generating electricity (up to 60% for natural gas) Conventional cars have an efficiency of about 20% Electric cars have an efficiency of about 80% Coal and natural gas are very cheap (and abundant, for now) per kWh per kWh from Ameren IL

6. Phys 150 Lecture 36

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9. Phys 150 Lecture 49

10. 12-Apr-2011 Phys 150 Lecture 2210 Hydraulic fracturing + horizontal drilling

11. 12-Apr-2011 Phys 150 Lecture 2211 i>clicker question The fossil fuel that produces the most carbon dioxide per kWh of energy is A.natural gas B.oil C.coal D.They’re all about the same.

12. 12-Apr-2011 Phys 150 Lecture 2212 i>clicker question The fossil fuel that produces the most carbon dioxide per kWh of energy is A.natural gas – CH 4 1/2 B.oil – hydrocarbons3/4 C.coal – carbon1 D.They’re all about the same. H ends up as H 2 O C ends up as CO 2

13. 12-Apr-2011 Phys 150 Lecture 2213 i>clicker question The fuel cost to drive an electric car one mile compared to a gasoline car is about A.the same B.1/2 C.1/4 D.1/8

14. 12-Apr-2011 Phys 150 Lecture 2214 i>clicker question The fuel cost to drive an electric car one mile compared to a gasoline car is about A.the same B.1/2 C.1/4 D.1/8 Gasoline: $3.50/gallon  10 cents/kWh Same price as electricity Efficiency: 20% for gasoline car, 80% for electric car

15. Gasoline Vehicle

16. Electric Vehicle (EV)

17. Plug-in Hybrid Electric Vehicle (PHEV)