E=\frac{g}{2}\frac{l^3d}{a^3br}\frac{m}{S-S_0}
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Recent Referers:
  1. http://www.edu.cc.uec.ac.jp/~k1710157/CL15/youngritsu.html
  2. http://www.edu.cc.uec.ac.jp/~k1710157/CL15/air_track.html