May 25 2009

Today in class we went over the two sheets ms.k gave to us on friday. One of the sheets answers are below this blog. The other sheet we did on the white boards. You will have to see someone in class for the answers for that sheet. today Ms.K gave us two more worksheets, she asked that they are to be finished for tomorrow's class so we can correct both of them in class. That's all we did today. Oh i forgot question 9 and 10 on the second sheet had to be handed in today. So that's it!!!!!!

Wednesday's Class

In today's class we had a substitue for Ms.K. He went over the two worksheets that Ms.K gave us during Monday's class. they are Concept And Developement Practice Page 26-1 and Unit 1.3 Sound. I'll give the answers below. the substitute gave us two more work sheets. one is a word search and the other is called Sound Waves.


ANSWERS:

CONCEPT AND DEVELOPEMENT 26-1

1. longitudinal
2. pitch
3. 2.5
4. long
5. a) behind
b) 9 seconds
6. solids
7. 4 seconds
8 a) will not
b) every other push will oppose the motion of the swing
9. 220 hertz
10. slightly different frequencies
11. 4 hertz
12. 345.2 m/s



UNIT 1.3 SOUND


1. 344M/S
2. a) Velocity in wood: 4000m/s
b) Velocity in air: 340.4m/s
c) Wood is 12x faster
3. a) d=4.08 x 10^3m
b) d=4.16 x 10^3m
c) d=4.31 x 10^3m
d) d=4.01 x 10^3m
4. wavelength = 3.8 x 10^-3
5. d=640m
6. 13.3 Celcius
7. a) v=347m/s
b) v=323m/s
8) d=345m


Those are the answers for the two sheets from Monday's class. You should probably finish the two worksheets the Sub gave us today for tomarrows class because Ms.K will probably go over them.