\ANG{
Potenzflaschenzug

\parbox[c]{0.35\linewidth}{
\begin{enumerate}
   \item Die Gewichtskraft einer losen Rolle betr"agt $100\,\mathrm{N}$ und
         die des Gewichts $G=800\,\mathrm{N}$. Welchen Betrag $F$ hat die Kraft $\vec{F}$,
         mit der du ziehen musst, damit sich der Flaschenzug im Gleichgewicht befindet?
   \item Das Massenst"uck soll um $2{,}0\,\mathrm{m}$ angehoben werden. Welche
         Seill"ange muss du dazu ziehen?
   \item Welche Arbeit verrichtest du dabei?
\end{enumerate}
}\hspace{0.05\linewidth}
\parbox[c]{0.6\linewidth}{
\begin{center}
    \psset{unit=1cm}
    \begin{pspicture}(-2,-1)(4.5,7.5)
        %% Aufhängebrett
        \psframe[linestyle=none,fillstyle=gradient,gradbegin=lightgray,
                 gradend=black,fillcolor=black,linewidth=1pt](-2,7.5)(4,8)
        \psline[linewidth=3pt](-1.98757,7.5)(3.98757,7.5)

        %% Haken 1
        \psline(-0.5,7.5)(-0.5,7.3)
        \psarc(-0.5,7.2){0.1}{180}{90}

        %% Haken 1
        \psline(0,7.5)(0,7.3)
        \psarc(0,7.2){0.1}{180}{90}
        \psline(0,7.1)(0,4.75)

        \psline(1,4.75)(1,6.75)

        \rput{0}(1.5,6.8){
           %% Feste Rolle
           \pscircle[fillstyle=solid,fillcolor=lightgray,linecolor=black](0,0){0.5}
           \psframe[fillstyle=solid,fillcolor=gray,linewidth=1.5pt](-0.2,-0.25)(0.2,0.65)
           \pscircle[fillstyle=solid,fillcolor=black,linecolor=white](0,0){0.1}
        }

        \rput{0}(0.5,4.8){
           %% Feste Rolle
           \pscircle[fillstyle=solid,fillcolor=lightgray,linecolor=black](0,0){0.5}
           \psframe[fillstyle=solid,fillcolor=gray,linewidth=1.5pt](-0.2,-0.65)(0.2,0.65)
           \pscircle[fillstyle=solid,fillcolor=black,linecolor=white](0,0){0.1}
        }
        \psline(0.5,4.15)(0.5,3.95)
        \psarc(0.5,3.85){0.1}{180}{90}
        \psline(0.5,2)(0.5,3.75)
        \psline(-0.5,2)(-0.5,7.1)

        %% Massenstück
        \psframe[fillstyle=solid, fillcolor=lightgray,linewidth=1.5pt](-0.5,-1)(0.5,0)
        \psline[linecolor=red]{->}(0,-0.5)(0,-2)
        \rput(-0.4,-1.5){\red$\vec{\bm{G}}$}
        \psdot(0,-0.5)

        %%\psgrid
        \rput{0}(0,2){
           %% Lose Rolle
           \pscircle[fillstyle=solid,fillcolor=lightgray,linecolor=black](0,0){0.5}
           \psframe[fillstyle=solid,fillcolor=gray,linewidth=1.5pt](-0.2,-0.65)(0.2,0.65)
           \pscircle[fillstyle=solid,fillcolor=black,linecolor=white](0,0){0.1}
        }
        %% Haken 3
        \psline(0,1.35)(0,1.15)
        \psarc(0,1.05){0.1}{180}{90}

        \psline(0,0.95)(0,0)

        \rput{315}(2.728553390,5.975){
           %% Kraftmesser
           \psframe[fillstyle=solid,fillcolor=blue](1,0)(2.5,0.3)
           \psframe*[linecolor=red](0.5,0.05)(0.6,0.25)
           \psframe*[linecolor=red](0.7,0.05)(0.8,0.25)
           \psframe*[linecolor=red](0.9,0.05)(1,0.25)
           \psline(0.5,0.05)(1,0.05)
           \psline(0.5,0.25)(1,0.25)
           \psline(0.5,0.05)(0.5,0.25)

           \psarc(0.1,0.15){0.1}{0}{270}
           \psline(0.2,0.15)(0.5,0.15)
           \psline(2.5,0.15)(2.8,0.15)
           \psarc(2.9,0.15){0.1}{180}{90}
        }
        \psline(1.8535533905,7.103553390)(2.8535533905,6.103553390)

        \pnode(4.953553390,3.95){P}
        \SpecialCoor
        \psline[linecolor=red]{->}(4.953553390,3.95)([nodesep=1.5,angle=-45]P)
        \rput(5.1,3.1){\red$\vec{\bm{F}}$}
    \end{pspicture}
\end{center}
}}
\LSG{
$250\,\mathrm{N}; 8{,}0\,\mathrm{m}; 2{,}0\,\mathrm{kJ}$.
}
