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Newtons cradle

  1. Nov 3, 2007 #1
    hey dudes

    i read in a book that when an electric current flow that the electrons move preety slow [maybe 1mm/s i'm not sure]
    now i also know electricity travels at the speed of light (ideally) so that an electron c*1s away will take 1s to start moving after i close the circuit

    so i was thinking about a newtons cradle
    if the moving ball hits the next ball at say .05m/s and all the balls add up to .05m then obviously it wont take a full second for the last ball to move, so how fast does the "impulse"? move through the stationary balls . i've a feeling its the speed of sound (in the medium of the balls) is that right?
     
  2. jcsd
  3. Nov 3, 2007 #2

    russ_watters

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    Staff: Mentor

    It is indeed the speed of sound.
     
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