Sites from class today AND HW (for next Tuesday)

Some of these are repeats from the other day:

Anna-Maria

https://www.youtube.com/watch?v=vC9Qh709gas

https://www.youtube.com/watch?v=UHTF1-IhuC0&feature=iv&src_vid=vC9Qh709gas&annotation_id=annotation_1970696487

https://www.youtube.com/watch?v=WlDi2XpK_dQ


Shattering wineglass

https://www.youtube.com/watch?v=cPALfz-6pnQ


Ruben's tube (from me)

https://www.youtube.com/watch?v=cqilJNsiqig


Longitudinal vs. transverse waves

http://www.animatedscience.co.uk/blog/wp-content/uploads/focus_waves/tl-wave.html

Animated:

http://www.acs.psu.edu/drussell/Demos/waves/wavemotion.html

http://www.acs.psu.edu/drussell/Demos/rad2/mdq.html


Wave forms in tubes

http://www.acs.psu.edu/drussell/Demos/StandingWaves/StandingWaves.html


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Practice problems:

Consider the musical note G, 392 Hz.  Find the following:

1.  The frequencies of the next two G's, one and two octaves above.

2.  The frequency of the G one octave lower than 392 Hz.

3.  The frequency of G#, one semi-tone (piano key or guitar fret) above this G.

4.  The frequency of A#, 3 semi-tones above G.

5.  The wavelength of the 392 Hz sound wave, assuming that the speed of sound is 340 m/s.

6.  What are the differences between longitudinal and transverse waves?  Gives examples of each.  What type of wave is sound?

7.  Use graphsketch.com/ and try to graph some functions.  Set the x-range as -6.3 to +6.3, and the y-range from -4 to +4.  Then graph these:

y = 3 sin(x)
y = sin(2x)
y = sin(x) + cos(x)
y = 2 sin(x) - 3cos(x)

Play around with anything that looks fun.  No need to write anything or print anything out - just play around with graphsketch.  If you're feeling ambitious, have a look at desmos.com.

PS.  I chose the x-range as I did because graphsketch uses radians (not degrees).  6.3 is close to 2pi, and 2pi is equal to 360 degrees.

Plan on a test next Thursday.  Yay!