Date: Fri, 15 Oct 2004 08:57:11 -0400

Author: sampere

Subject: localized energy mode demo, i.e pendulum revisited


I saw the coolest demo yesterday. Al Sievers from Cornell gave a
colloquium here yesterday and brought a demo with him.

Picture a dozen small identical pendulms suspended from a single rod,
perhaps from a bearing, so the rod does not play any role in
transferring energy. Then, connect each of the pivot points with
springs so that as the pendulums oscillate, the springs either wind up
or unwind. The direction of oscillation is perpendicular to the length
of the suspension rod, i.e., if the pendulums all dangle from rod
horizontal and parallel to your screen, the pendulums oscillate in and
out of the screen.

So, here are two questions for you:

1) For small starting amplitudes, the initial conditions for all pendula
being equal, what do expect to see?
2) Same as 1, but for very large starting amplitudes?

I'll post the answer later after I hear your thoughts.

From Fri Oct 15 06:12:56 2004