1. Introduction Physics 100 “Physics for poets” Stephen L. Olsen

2. Class procedures Put this in your “hotlist”

3. Tentative Schedule

4. Homework will be graded About 8 ~ 9 questions per assignment look on the web page for hints

5. What does “Physics” mean? Greek: φίσίσ phisis  Nature Chinese: 物理 WU LI “things” “logic”  “The logic of things” or “How things work”

6. What kind of “things”? Ordinary-sized objects: : apples : footballs : ukuleles : etc.

7. Gigantic things Earth Sun galaxies etc.

8. Very tiny things molecules atoms cells quarks

9. Galileo Galilei 1562 - 1642

10. One meter of length 1 meter = 40 inches (1.1 yds) 1 centimeter = 1/100 meters (about the radius of a penny) 1 millimeter = 1/1000 meters (about the thickness of a dime) 1 kilometer = 1000 meters (about 5/8 th of a mile) 10,000,000m

11. Coordinate systems x z y To describe the position of an object: You need to define a coordinate system (reference frame) & determine 3 coordinates e.g. x, y & z Choices of location of the coordinate system & directions of the axes are up the observer.

12. Some distances Nose to finger~1 m The back of the room~10 m Campus Center~100 m Varsity theatre~1000 m North shore~50000 m Center of Earth~6400000 m Earth to Moon ~385000000 m Earth to Sun~150000000000 m Next star~40000000000000000 m

13. Some small sizes radius of a penny~0.01 m thickness of a dime~0.001 m thickness of a human hair ~0.000075 m diameter of a red blood cell~0.00000002 m size of hydrogen atom ~0.00000000006 m size of hydrogen nucleus ~0.0000000000000001 m

14. Exponential logic

15. Powers of 10 $50000.0 = $5000.00 x 10 Move the decimal point 1 place to the left multiply by 10 & $0.01 = $00.1 x 1/10 Move the decimal point 1 place to the right divide by 10 &

16. Positive powers of 10 150000000000150000000000.15000000000.0 x 10 1 1500000000.00 x 10 2 150000000.000 x 10 3 15000000.0000 x 10 4 1500000.00000 x 10 5 150000.000000 x 10 6 15000.0000000 x 10 7 1500.00000000 x 10 8 150.0000000000 x 10 9 15.0000000000 x 10 10 1.50000000000 x 10 11 = 1.5 x 10 11 1500000000.00 x 10x10 11 jumps to the left  +11 in the exponent

17. Some distances Nose to finger~1 m The back of the room~10 m Campus Center~100 m Varsity theatre~1000 m North shore~50000 m Center of Earth ~6400000 m Earth to Moon ~386,000,000 m Earth to Sun~150000000000 m Next star~40000000000000000 m ~5.0 x 10 4 m ~6.4 x 10 6 m ~3.86 x 10 8 m ~1.5 x 10 11 m ~4.0 x 10 16 m

18. Negative powers of 10 0.0000000000600.0000000006 x 1/1000.0000000006 x 10 -1 000.000000006 x 10 -1 x10 -1 000.000000006 x 10 -2 0000.00000006 x 10 -3 00000.0000006 x 10 -4 000000.000006 x 10 -5 0000000.00006 x 10 -6 00000000.0006 x 10 -7 000000000.006 x 10 -8 0000000000.06 x 10 -9 00000000000.6 x 10 -10 000000000006.x 10 -11 = 6.0 x 10 -11 11 jumps to the right  -11 in the exponent

19. Some small sizes radius of a penny~0.01 m thickness of a dime~0.001 m thickness of a human hair ~0.000075 m diameter of a red blood cell~0.00000002 m size of hydrogen atom ~0.00000000006 m size of hydrogen nucleus ~0.000000000000001 m ~7.5 x 10 -5 m ~2.0 x 10 -8 m ~6.0 x 10 -11 m ~1.0 x 10 -15 m

20. Multiplying large numbers Use the rule: (A x 10 a ) x (B x 10 b ) = (AxB) x (10 a x10 b ) Number of people In the US x Income/person 296,000,000 x $ 40,100 = 2.96x10 8 x $ 4.01x10 4 = (2.96 x $4.01) x (10 8 x 10 4 ) = $11.9 x 10 8+4 =$11.9 x 10 12 = $1.19 x 10 13 on 8/23/05 10 a+b

21. dividing large numbers = US national debt # of persons in US on 8/23/05 Ax10 a Bx10 b x= = x 10 a x 10 -b $7,930,000,000,000 296,000,000 persons $7.93 x 10 12 2.96 x 10 8 persons == $7.93 10 12 2.96 10 8 persons x = $2.68 x 10 12- 8 / person move b upstairs = $2.68 x 10 4 / person (= $26,800/ person ) ABAB ABAB 10 a 10 b & change sign 10 a-b

22. Powers of 10 (film)