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Homework Help: The Shot of a Rifle

  1. Jan 20, 2006 #1
    A 5.0 g bullet leaves the muzzle of a rifle with a speed of 320 m/s, What force (assumed constant) is exerted on the bullet while it is traveling down the .82 m long barrel of the rifle?

    This is what I have so far. : [.

    (320)^2/(2*.82)=t

    320/t=a

    a= 62439

    62439*.005
    =312

    The back of the book is 310. What did I do wrong?
     
  2. jcsd
  3. Jan 20, 2006 #2
    I got what you got.
     
  4. Jan 20, 2006 #3
    probably because the book gives answers in significant figures?
     
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