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.