Solving Differential Equations • Physics Forums

hossam killua · 2014-11-07T16:44:39+00:00

by chain rule or by homegenious function idk how to start with chain rule or uing homoginus function

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 Solving Differential Equations

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

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