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Penetrating 9 feet of concrete?

  1. Apr 26, 2006 #1
    How much kinetic energy or momentum would an object need to penetrate 9 feet of heavy grade reinforced concrete?
     
  2. jcsd
  3. Apr 26, 2006 #2

    Pengwuino

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    The question is waaaaaaaaaaaay too vague. Are you talking about things like bunker busters?
     
  4. Apr 27, 2006 #3

    vanesch

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    Neutrinos do it with less than an electronvolt...
     
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