1. 講者： 許永昌 老師 1

2. Contents Fluids and Density Pressure Pressure in Liquids (static) The pressure at depth d: p=p 0 +  gd. Buoyancy: Bernoulli’s Equation p+ ½  v 2 +  gh=constant. Elasticity 2

3. Fluids ( 請預讀 P442~P444) A fluid is a substance that flows. Gases: compressible. Liquids: ~incompressible. 3

4. Action: 4 Exercise: 1 m 3 =? cm 3

5. Pressure ( 請預讀 P445~P450) 5

6. Pressure (causes and properties) 6

7. Action: (P447) 7

8. Pressure in Liquids 8

9. Quiz The pressures at points 1  5. 9 23 1 45

10. Applications: ( 請預讀 P451~P455) Gauge pressure: p g =p - 1 atm. Manometers & Barometers: Hydraulic lift: 10 p0p0 F=pA 上升 d 2 高度所要花的力氣的 變化。

11. Exercise Textbook 15.41 (P472) 11

12. Homework Student Workbook 15.1 15.5 15.7 15.10 12

13. Buoyancy ( 浮力 ) ( 請預讀 P455~P459) 13

14. Action: 14

15. Exercise Rank the scale readings. 15

16. Homework Student Workbook 15.14 14.17 16

17. Fluid Dynamics ( 請預讀 P459~P461) 17 (1)Never cross (2)

18. Flow tube Flow tube is a bundle of neighboring streamlines 18

19. Bernoulli’s Equation ( 請預讀 P462~P465) 19

20. Action: 20

21. Two applications ( 請預讀 P465) 21

22. Exercise Stop to think 15.6 (P466) Conceptual questions 15.10 (P470) 22 v=? hAssume that A 1 >> A 2

23. Elasticity ( 請預讀 P466~P468) 23

24. Bulk Modulus We use this concept to predict the speed of sound: http://en.wikipedia.org/wiki/Speed_of_sound Adiabatic process for ideal gas: PV  =constant. We get Assume that p=P-P 0, we get Speed of sound 24

25. Homework Textbook 15.33 15.48 15.61 Student workbook 15.19 15.20 15.22 15.23 15.25 請製作卡片。 25