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Stuck on Part 2

  1. Oct 26, 2008 #1
    1. The problem statement, all variables and given/known data
    Already Solved(Part 1) :A 30-06 caliber hunting rifle fires a bullet of mass of 0.00689 kg with a velocity of 778 m/s to the right. The rifle has a mass of 3.34 kg. What is the recoil speed of the rifle as the bullet leaves the rifle. Answer in units of m/s. Answer is 1.6049

    Part 2: If the rifle is stopped by the hunter's shoulder in a distance of 1.36 cm, what is the magnitude of the average force exerted on the shoulder by the rifle? Answer in units of N.
    2. Relevant equations
    1. Vaverage= O + Vi(1.6049) / 2
    2.∆T = 2x/ Vi
    3. F∆t=∆mv
    4. F=MVi /∆t

    3. The attempt at a solution
    1. 0+1.6049/2 = 0.80245
    2. 2(1.36) / 1.6049 = 1.694809645
    4. (3.34)(1.6049) / 1.694809645 = 3.162813013.
    This was my answer by I know that the force is too low for a bullet hitting a shoulder...What did I do wrong?
  2. jcsd
  3. Oct 26, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Can you not work out the average acceleration of the rifle and then the magnitude of the force from that?
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