You're Standing in my Wave....

As I mentioned in class today, I expect you to be checking this blog on a daily basis to get answers for the HW assignments. This is more of an issue for those of you that are NOT staying for tutoring during 8th or after school.

below you will find a list of the last four digits of the OSIS numbers of people in the class, along with a five letter code word. Please post a comment or send me an email with your codeword to confirm you have checked the blog.

8950 - bbjah
1893 - qpkaj
3853 - zzytn
2615 - jjajs
9409 - quahl
6872 - hhsga
9021 - bnxma
6990 - jqpwo
6352 - nnzna
2531 - mqpao
1679 - mansp
9200 - gsgah
9226 - bbzna
0598 - nnqma
6706 - mpaoq


Q25. The nodes are locations of zero amplitude, so these positions could be touched without disturbing the wave.

Problems:
18. amplitude = 0.3500 meters, frequency = .8754 Hz, period = 1.142 seconds, total energy = .7411 J, KE = .6807 J and PE = .0604 J

51. 440 Hz, 880 Hz, 1320 Hz, 1760 Hz (f_n = nv/2L)
53. 70 Hz, 140 Hz, 210 Hz, 350 Hz
55. nodes are always a half wavelength apart from each other - wavelength is 19.37 cm, so nodes are half of this, 9.685 cm.
56. 87.5 Hz, n = 3 and 4 for the given frequencies.
60. m = 4f²L²*mu/(n²g), so m = 1.421 kg, .355 kg, .0568 kg for (a), (b), and (c).

Web sites from today:

http://www.colorado.edu/physics/2000/applets/fourier.html- Constructive/Destructive Interference

http://home.austin.rr.com/jmjensen/JeffString.html

Reflected Waves


http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=19 - Waves traveling in opposite directions making standing waves



Standing Wave - nodes and antinodes

http://id.mind.net/~zona/mstm/physics/waves/standingWaves/standingWaves1/StandingWaves1.html - Vibrating string, standing waves fixed at both ends.

http://www.walter-fendt.de/ph11e/stlwaves.htm - open/closed Tube with standing waves