PSN-L Email List Message

Subject: Concerning "A vertical and horizontal sensing pendulum"
From: Randall Peters PETERS_RD@..........
Date: Wed, 13 Aug 2008 08:28:04 -0400

    I am trying to understand the vertical response that you mention for
the system described at
With the pendulum hanging initially at equilibrium (center of mass
directly below the center of the ruby spheres) I can't envision any
physical mechanism for which a strictly vertical acceleration is capable
of producing motion.

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