Periodic Wave Generated by a Pendulum Sandglass

This Demonstration shows a wave generated by a pendulum sandglass. The wave is well approximated as a sinusoid, but not exactly since this is a spherical pendulum. The pendulum consists of a hollow tube with sand running down from a funnel at the top. It is assumed that the pendulum's mass and period are constant and that frictional losses can be neglected.


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[1] Wikipedia. "Pendulum." (Dec 29, 2011)
[2] Wikipedia. "Sandglass." (Nov 17, 2010)
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