Mon Jun 11 17:36:23 CEST 2007
Corrected the misprints in the following problems:
 - in Aufgabe 1, Eq.(6) 
   x_2=r sin\theta \cos\varphi --> x_2=r sin\theta \sin\varphi.
   Thanks to Sophia Mueller for reporting the misprint.
 - in (1f), the last two terms in a_\varphi:
   2r\sin\theta\dot{r}\dot{\varphi} --> 2\sin\theta\dot{r}\dot{\varphi}
   r\cos\theta\dot{\theta}\dot{\varphi} --> 2r\cos\theta\dot{\theta}\dot{\varphi}
   Thanks to all people who reported this misprint.
 - in Aufgabe (2h), Eq.(8)
   \omega --> \omega^2
   mgR --> (g/R)