- #1
PhysicsKid0123
- 95
- 1
Quick question (a little rusty on this): Why don't unit vectors in Cartesian Coordinates not change with time? For example, suppose [tex] \mathbf{r} (t) = x(t) \mathbf{x} + y(t) \mathbf{y} + z(t) \mathbf{z}[/tex] How exactly do we know that the unit vectors don't change with time?
Or in other words, what is the argument that justifies this expression: [tex] \frac{d }{dt}\mathbf{x} = 0[/tex]
Or in other words, what is the argument that justifies this expression: [tex] \frac{d }{dt}\mathbf{x} = 0[/tex]
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