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Rigid body vs. speed of light

  1. Jan 24, 2012 #1
    Sorry in advance if this is a ridiculous question, but I've always wondered about this.

    Let's say we could create a wire in space away from any gravitational affects. Make the wire 2 light seconds long, for example. If we pulled on one end, when would the effects be felt on the other end? I'm assuming that we could create a zero-stretch material (maybe a very bad assumption).
    Last edited: Jan 24, 2012
  2. jcsd
  3. Jan 24, 2012 #2

    Doc Al

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  4. Jan 24, 2012 #3


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    welcome to pf!

    hi etriad! welcome to pf! :smile:
    at least 2 seconds later …

    the wire is mostly empty space: the molecules in it are bound together only by electromagnetism, and electromagnetic effects can't travel faster than light :wink:
  5. Jan 24, 2012 #4
    Thanks for the link.
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