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Tough physics problem - please help

  1. Mar 3, 2007 #1
    A chain of length L and total mass M is released from rest with its lower end just touching the top of a table, as in figure
    (a). Find the force exerted by the table on the chain after the chain has fallen through a distance x, as in figure (b).
    Assume each link comes to rest the instant it reaches the table.

    figure can be found at


    The answer is 3xgM/L if you wonder. I want to know how that is achieved.
  2. jcsd
  3. Mar 3, 2007 #2
    I could not access the figure. Would you please see if you can fix that?
  4. Mar 3, 2007 #3
  5. Mar 3, 2007 #4
    hmm, it doesn't get posted
    try google: "released from rest with its lower end"
    there is a pdf file that has harvard on it.
    and it's #11 of that

  6. Mar 3, 2007 #5
    I see the image, before you get help you must show your thoughts about the problem. Say something about it.
  7. Mar 29, 2007 #6
    a hint gravity and impulse
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