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Bullet into Ice

  1. May 24, 2007 #1
    A 2.65g aluminum bullet at 31.4°C is fired at a speed of 209 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts?


    so i get a final answer of 2.23E-4kg but its wrong. i think im either missing a step because im not using the velocity of the bullet, or im plugging wrong numbers in. any help is appreciated.
  2. jcsd
  3. May 24, 2007 #2


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    I think you need to consider the change in kinetic energy, which i assume is all converted to heat energy, thus, increasing the temperature of the bullet.
  4. May 24, 2007 #3
    what formula would i use for that? i looked in my book and i couldnt come up with a formula...
  5. May 24, 2007 #4


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    Well kinetic energy is given by [tex]E_k = \frac{{mv^2 }}{2}[/tex].

    You can work out the initial kinetic energy by simply using m=0.00265, v=209, and then find a final kinetic energy, using the same mass, but v=0, since it has stopped in the ice. Then find the change in energy from those.
  6. May 24, 2007 #5
    alright i got it thank you very much!
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