Errata: In Example 2.7, q should be replaced by p (three places) and theta (one place)
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Location: page 49, line -8 to -4
The position variable for the balance system should be p instead of q. In addition, the quadratic term at the end of the first line of the displayed equation should be θ. The correct equation for the dynamics is therefore

In addition, the scaled variable x in line -4 should be x = p / l.
(Contributed by M. Kang [SNU], 7 Dec 2010)
