%%
%% A DANTE-Edition example
%%
%% Example 36-00-9 on page 772.
%%
%% Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}
\usepackage{pstricks,pst-grad,amsmath}
\SpecialCoor
\definecolor{braun}{rgb}{0.8, 0.2, 0.4}
\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}
