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Homework Help: Prove identity

  1. Dec 19, 2011 #1
    1. The problem statement, all variables and given/known data
    [tex]\frac{\partial \vec{r}}{\partial q_i}gradf(r)=\frac{\partial f(r)}{\partial q_i}[/tex]



    2. Relevant equations
    [tex]gradf(r)=\frac{df}{dr}gradr=\frac{df}{dr}\frac{ \vec{r}}{r}=\frac{df}{dr}\vec{r}_0[/tex]



    3. The attempt at a solution
    [tex]\frac{\partial \vec{r}}{\partial q_i}\frac{df}{dr}\vec{r}_0=?[/tex]
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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