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A generalized view about impédance of basic components and combination of components is exposed in the paper "The Phasance Concept" published on Scibd : http://www.scribd.com/JJacquelin/documents

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A simple answer: motion is relative thus, there is always an implied reference. In other words, if you read or hear the phrase "X is stationary", you should immediately think "stationary with respect to what?". Most often, it is the case that an unqualified "stationary" means "at rest with respect to the measuring apparatus" or "with respect to the lab". ...

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This term is used all the time in introductory classical physics. In that context, stationary usually means not moving in the laboratory frame. Thus, a block sitting on a table not doing much would be referred to as being stationary. If one studies relative motion, then stationary could mean not moving in whatever frame you're discussing.

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This is a really good question, with a mind-bending answer. Check this out: (A) Pick a random electron at a random time. How long (on average) do I need to wait until the next time it collides? (B) Pick a random electron at a random time. How long (on average) has it been since the last time it collided? (C) Pick a random electron that just collided. How ...

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Ref : Polchinski Vol $1$, pages $146-150$ With a torus topology, with identifications $(\sigma_1, \sigma_2) \sim (\sigma_1, \sigma_2) + 2\pi(m,n)$, one may bring the worldsheet metrics to the form $ds^2 = |d\sigma_1 + \tau d\sigma_2|^2 = dw d \bar w$, where $\tau$ is a complex constant (the moduli). The periodicity is expressed by \$w \sim w + ...

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