It is known that the vector in polar coordinate system can be expressed as [tex]\mathbf{r}=r\hat{r}[/tex]. In this formula, we don't see [tex]\hat{\theta}[/tex] appear.(adsbygoogle = window.adsbygoogle || []).push({});

But after the derivation yielding speed, [tex]\mathbf{v}=\dot{r}\hat{r}+r\dot{\theta}\hat{\theta}[/tex]. Where does theta come from? And how to define its magnitude and direction?

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# Confused with polar vector

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