Monday, October 20 , 2008

Hi guys....it's me again, Lorenz. Here's what we did today if anyone missed our class.

First, Mrs. Kozoriz gave us back our test that we had last Friday. Hope everyone passed!!! Here are the answers in case you guys did not correct your test.

1) Tuning fork compresses the air molecules and then expands the air molecules.
2) Air molecules compress and rarefacts.
3) V = 332 + (0.6)(25)
= 332 + 15
= 347m/s
4) wavelength = 3.5mm = 3.5x10^-3mm
f = ?
f = v/wavelength = 347/3.5x10^-3 = 9.5x10^4Hz
5) a. 10x10x10 = 1000x louder
b. 10x10x = 100x softer
6) No
7) f = 20/5 = 4Hz
256 - 4 = 252Hz
256 + 4 = 260Hz
8) Soldiers are marching at a steady pace in unison. This repeated small vibration increases the amplitude which could match the resonant frequency of the bridge. Soldiers should march out of step to prevent this.
9) 1024Hz
10) Constructive Interference
Destructive Interference
11) approaching my position
12) V = 332 + (0.6)(4.0)
= 332 + 2.4
= 334.4m/s
d = vt
= 334.4(2.80)
= 468.16 or 470m

Secondly, we answered the Significant Figures that she gave us last Friday after the test. Here's all the answers.
1)
a. 3038m - Significant - Rule2
b. 1.561L - Significant - Rule1
c. 0.074mm - Not Significant - Rule4
d. 5050s - Not Significant - Rule4
e 3.007km -Significant - Rule2
f. 6.10*C - Not Significant - Rule3
g. 821.0g -Not Significant - Rule1
h. 0.560g - Not Significant - Rule4
2)
a. 2 , b. 4 , c. infinite , d. 2 , e. 3 , f. 3 , g. 3 , h. 7 , i. 4 , j. 3 , k. 2 , l. 3 , m. 3 , n. 2 , o. 5 p. 1 , q. 3 , r. 3 , s. infinite , t. 4 , u. 5 , v. 3 , w. 3 , x. 3 , y. 1 , z. 4

Lastly,she gave us the booklet for Nature of Light: Part 1 , we had a lab about the question : " What is the object inside the box?" and she told us to read pages 2 - 7 for homework!!!
So yea...STUDY PEOPLE!!!=)ohh yea, next blog would be my one and only seatmate Ms. Nelsa "Dimple" Limuaco....