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Re: water waves perpendicular to the piston



You can also have great fun at the company water cooler (the kind with the
big blue bottle). When the water level is about half way, it is easy to
excite the first mode by a fortuitous bubble or by rocking at the right
frequency. Actually, the second mode comes along with the proper rocking.
The amplitudes are surprising. Waves are ALWAYS fun. Thanks for the insight.

Tom Ford

At 05:49 PM 6/25/01 -0700, you wrote:
When making a wineglass "sing", if the glass is partly full of liquid,
then tiny standing waves appear on the surface. I've always wondered, do
they have a name?

I managed to produce a much larger example of these waves in a swimming
pool. By oscillating a long foam cylinder perpendicular to its axis in
the water, after a few moments a set of "standing waves" appear which are
adjacent to the cylinder and with the antinode peaks oriented
perpendicular to it, like so:



TOP VIEW OF THE CYLINDER
__
| |
| |
| |----
| |
| |------- antinodes
| |
| |---------
| |
| |-------
| |
| |----
| |
|__|


Anyone familar with this effect?


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