- #1
Saladsamurai
- 3,020
- 7
Homework Statement
Homework Equations
Chain Rule
The Attempt at a Solution
So we have that [itex]f = f(x,t)[/itex] as well as the transformations [itex]x = x' + Vt'[/itex] and [itex] t = t'[/itex]
By the chain rule:
[tex]\frac{\partial{f}}{\partial{t'}} =
\frac{\partial{f}}{\partial{x}}\frac{\partial{x}}{\partial{t'}} +
\frac{\partial{f}}{\partial{t}}\frac{\partial{t}}{\partial{t'}}
[/tex]
[tex]\Rightarrow
\frac{\partial{f}}{\partial{t'}} =
\frac{\partial{f}}{\partial{x}} *
\left [ \frac{\partial{x}}{\partial{t'}}+V+t'\frac{\partial{V}}{\partial{t'}}\right ]
+ \frac{\partial{f}}{\partial{t}}\frac{\partial{t'}}{\partial{t'}}
[/tex]
[tex]\Rightarrow
\frac{\partial{f}}{\partial{t'}} =
\frac{\partial{f}}{\partial{x}} *
\left [ \frac{\partial{x}}{\partial{t'}}+V+t'\frac{\partial{V}}{\partial{t'}}\right ]
+ \frac{\partial{f}}{\partial{t}}
[/tex]
Not really sure what the next move is? Is the above equation in its simplest form? Or can I do something more with it?
Also, I don't really see how I go about transforming [itex]\rho'[/itex] and [itex]v'[/itex] into the x-t coordinates?
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