%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{190.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-grad,amsmath}
\SpecialCoor
\definecolor{braun}{rgb}{0.8, 0.2, 0.4}
\StopShownPreambleCommands
\begin{document}
\psset{unit=0.6}
\begin{pspicture}(-4.5,-4.75)(5.5,2.5)
\pscustom[fillstyle=solid,fillcolor=braun]{%
  \psline(2.3,0.2)(4,0.2)
  \psarcn(4,0){0.2}{90}{-90}
  \psline(4,-0.2)(2.3,-0.2)
}
\psline(0,2.5)(0.3,2.5)
\psellipse(0.3,0)(2,2.5)
\psline(0.3,-2.5)(0,-2.5)
\psellipse[fillstyle=gradient,gradangle=90,gradbegin=white,gradend=braun](0,0)(2,2.5)
\pscustom[fillstyle=solid,fillcolor=braun]{%
  \psline(-4,0.2)(0,0.2)
  \psarcn(0,0){0.2}{90}{-90}
  \psline(0,-0.2)(-4,-0.2)
}
\psline[linecolor=white,linewidth=0.1]{->}(0,0)(2.5;-90)
\rput(-0.25,-1.5){\white\Large$\boldsymbol{\vec{r}}$}
\pscircle[fillstyle=solid](-4,0){0.2}
\psline[linewidth=0.2]{|-}(-3.5,-3)(-3.5,-0.2)
\psline[linewidth=0.2]{|-}(3.5,-3)(3.5,-0.2)
\pscustom[fillstyle=solid,fillcolor=lightgray]{%
    \psellipticarcn(0,0)(2,2.5){90}{50}
    \psline(2.25;50)(4.9,-4)(5.2,-4)(2.5;50)
    \psellipticarc(0.3,0)(2,2.5){50}{90}
}
\psline[linewidth=0.2,linecolor=red]{->}(5,-4)(5.65,-5)
\uput[0](4,-4.5){\Large $\vec{F}$}
\end{pspicture}
\end{document}