Need help on Fourier Series (badly) • Physics Forums

jimmy93 · 2016-11-02T01:04:32+00:00

Need help on Fourier series! Been stuck on this questions, it is too tough for me!

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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MHB Need help on Fourier Series (badly)

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

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