1. Wednesday 12-19 ps CP test Honors Homework Finish notes

2. Schedule for today Period 7 7:48-8:23 Period 6 8:26-9:01 Period 3 9:04-9:39 Period 4 9:42 – 10:20 Period 5 10:23-10:55 Period 1 10:58-11:10 Lunch 11:10-11:40 Period 1 11:43-12:06 Auditorium Period 2 1:48-2:25

3. Test answers Multiple choice Version J 1) C2) D3) B4) B Version K 1) A2) D3) D4) B Version L 1) D2) C3) A4) A

4. Question #1 Givens: Force = 1500 N, Acceleration =2.5 Wanted: Mass Equation: F = ma Conversion: none Plug In: 1500 = 2.5m Answer (with units): 600 kg

5. Question #2 Givens: Acc = 29.6, t = 6.8, vi = 0 Wanted: final velocity Equation: (vf – vi) / t Conversion: none Plug In: (vf – 0) / 6.8 = 29.6 Answer (with units)

6. Question 3 Givens: Wanted: Equation: Conversion: Plug In: Answer (with units): 2,800,000 J

7. Question 4 Givens: Wanted: Equation: Conversion: Plug In: Answer (with units): 4257 J

8. Question 5 Givens: Wanted: Equation: Conversion: Plug In: Answer (with units): 195 kg m/s

9. Question 6 Givens: 20300 kg = m Wanted: Equation: Conversion: Plug In: Answer (with units): 2.5 e8 J

10. Question Givens: 0.0594 kg = m Wanted: Equation: Conversion: Plug In: Answer (with units): 3900 J

11. Answers to honors assignment

12. Answers to Homework Pg 471 problems 1-7 1) 2) wavelength (m), period (s), frequency (hz), wave speed (m/s) 3) frequency and period are inverse of each other 4) Sound travels faster in liquids and solids because the particles of the medium are closer together than the particles of air

13. Answers P471 5-7 5) The wavelength becomes half the original size 6) The pitch will sound higher as the train approaches and will become lower as the whistle passes 7) 660 m/s

14. Answers p 480 9) d amplitude 10) a frequency 11) c frequency

15. Answers 481-82 29-36 29) 6 m/s 30) 3.0 m/s 31a) 570 m, 31b) 5.0e-7, 31c) 1.0e-10 32) ƒrange 1e9 to 3e11 33) λrange 10 m to 1000 m 34) 440 Hz

16. Answers P482 35-36 35) 36a) 0.09 m 36b) 0.2 m 36c) 5.0 m/s 36d) 0.04 s

17. Any questions on homework?

18. Describe these concepts Wave Mechanical Waves Electromechanical Waves Medium Transverse waves Longitudinal waves Crests Troughs Amplitude

19. Describe these ideas Period Frequency Wavelength Wave speed Pitch Doppler effect

20. Describe these concepts Reflection Refraction Diffraction Interference Principle of superposition Constructive interference Destructive interference

21. Question 1) Imagine you are waiting for a train to pass at a railroad crossing. Will the train have a higher pitch as it approaches you or after it has passed you by. Explain your answer. 2) The number of waves passing a given point per unit time is called the ________

22. Interference Objects can not occupy the same place at the same time Waves can The combination of several waves to produce a single wave at a certain place is called interference

23. The principle of superposition The resulting wave can be found by adding the height of waves at each point Crests are positive Troughs are negative

25. Constructive Interference Interference where the resulting wave is bigger the originals

26. Destructive Interference Interference where the resulting wave is smaller than the originals Total destruction occurs when the crest of one wave crosses the trough of the another same size wave

27. Change in waves Changes frequency In sound, different pitch In light, different colors

28. Interference between light bouncing off both sides of film

29. New homework Pg 478 1-4 Pg 480 12-15 Pg 481 23-26 Pg 482 37-41