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Conservation of Momentum Question

  1. Oct 10, 2013 #1
    1. The problem statement, all variables and given/known data

    We are learning momentum in physics class and I am having problems with this question.

    25umqlf.png

    i) An object at rest explodes into three pieces. Immediately after the explosion, two pieces have momenta given by F and A. Which vector describes the momentum of the third piece?

    ii) An object at rest explodes into three pieces. Immediately after the explosion, two pieces have momenta given by B and C. Which vector describes the momentum of the third piece?

    iii) An object at rest explodes into three pieces. Immediately after the explosion, two pieces have momenta given by D and E. Which vector describes the momentum of the third piece?

    iv) An object moving with momentum E explodes into three pieces. Immediately after the explosion, two pieces have momenta given by V and D. Which vector describes the momentum of the third piece?

    v) An object moving with momentum G explodes into three pieces. Immediately after the explosion, two pieces have momenta given by B and D. Which vector describes the momentum of the third piece?

    2. Relevant equations

    p=m*v

    3. The attempt at a solution

    i) C

    ii) G

    iii) A

    iv) Hard one, R., I believe

    v) C, I believe


    /thank you/
    noobe
     
  2. jcsd
  3. Oct 10, 2013 #2

    NascentOxygen

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    Staff: Mentor

    We need this and the other 3 parts to each be accompanied by a scaled diagram so we can check whether you are doing it correctly.

    I agree with C here.

    I don't agree with your answer.

    Diagrams please.
     
  4. Oct 10, 2013 #3
    Hmm, do I have to measure each angle then use the formula?

    Is there a way to look at it visually?
     
  5. Oct 11, 2013 #4

    NascentOxygen

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    Staff: Mentor

    Graphically. You trace the lines, so you get length and angle correctly, and add vectors graphically on paper.
     
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