\magnification = \magstep2

$$
{\rm power\ } P \quad = \quad {{\rm work} \over {\rm time} }  
$$

$$
\eqalign{
W \quad &= \quad \int{ \vec{F} \cdot \vec{dx} } \quad = \vec{F} \cdot \vec{L} \cr
        &= \quad F L \cr
}
$$



\bye
\end
