Calculate Field Flux on C: Grad(f)

IgorM · 2011-11-23T02:11:28+00:00

Can anyone show me how to do this? http://img853.imageshack.us/img853/739/38647978.jpg http://img21.imageshack.us/img21/3074/62209167.jpg Calculate the flux of the field grad(f) on C.

Thread 'How does time derivative commute from one variable to another?'

I'm reviewing Meirovitch's "Methods of Analytical Dynamics," and I don't understand the commutation of the derivative from r to dr: $$ \mathbf{F} \cdot d\mathbf{r} = m \ddot{\mathbf{r}} \cdot d\mathbf{r} = m\mathbf{\dot{r}} \cdot d\mathbf{\dot{r}} $$

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Thread 'How does time derivative commute from one variable to another?'

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