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Nothing is faster than Light, Right?

  1. Jan 13, 2012 #1
    First of all, lets consider that this question is asked before neutrino's speed was discovered.

    " Lets consider a rod, a rod which is as long as 1 light year.

    Consider that it is a rigid rod of steel with diameter 1m (to prevent bending)

    I gave a nudge to it from one side, then the whole rod will displace, right?

    For example, i pushed the rod by 1m, then the rod will move 1m, right?

    Ohh, look what happened! Something went faster than light! A lot faster! "

    If you didnt get the above case, ill explain what happened:

    I used the rod to send a 'message' by pushing and pulling it. Hence, it traveled faster the speed of light, since it conveyed the message through 1 light year almost instantly.

    If you disagree with the above, give approximations of the speed of the message, if its not faster than 'c'.
     
  2. jcsd
  3. Jan 13, 2012 #2

    berkeman

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    Staff: Mentor

    Please read the FAQ in the Special & General Relativity forum about this question. The signal propagates at the speed of sound in the rod.

    https://www.physicsforums.com/showthread.php?t=536289 [Broken]

    .
     
    Last edited by a moderator: May 5, 2017
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