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| | Waves & Sound (Site not responding. Last check: 2007-10-18) |
 | | In dry air at sea level at freezing temperature (zero degrees Celsius), the speed of sound is 331.6 meters per second, or 1,194 KPH (742 MPH). |
 | | Of course, this works best when the sounds are predictable, for example the constant rumble of a large ventilation fan. |
 | | Analysis of a torsional pendulum is a little more complicated than that of a normal swinging pendulum, but the period of a torsional pendulum is also relatively constant, and it has also been used as a timekeeping element of clocks. |
| www.kosmoi.com /Science/Physics/Waves (4737 words) |
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