The sudden recoil of a DC motor when it starts rotating. See: http://arxiv.org/abs/0710.2155  It contains analysis of this and other examples.

Applications of recoil principle in classical physics
I am going through a large website (1600+ pages) to make it pass Priority 1 W3C WAI.  As a result, things like image tags need to have alt attributes.

What would be the regular expression for finding img tags without alt attributes?  If possible, with a wee explanation so I can use to find other issues.

I am in an office with Visual Web Developer 2008.  The Edit >> Find dialogue can use regular expressions.
