1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Collisions problem

  1. Feb 13, 2008 #1
    1. The problem statement, all variables and given/known data

    a 600 kg canon, initially at rest, exploded upon firing and broke in to three fragments. One fragment of mass of 200 kg travelled east at 40m/s and a second fragment of mass 300 kg travelled due south at 20 m/s. What was the velocity of the third fragment?

    2. Relevant equations

    sum of P = sum of P'
    0= P1 + P2 + P3

    3. The attempt at a solution

    I'm not sure whether I'm supposed to use trig or something to find the missing velocity.
    Any help would be GREATLY appreciated.
     
  2. jcsd
  3. Feb 13, 2008 #2

    PhanthomJay

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Momentum is a vector quantity, and as such, the sum of the momenta must obey the laws of vector additions. Are you familiar with resultants and vector sums?
     
  4. Feb 13, 2008 #3
    This is what I have so far. Am I on the right track?
    Will the resultant be the hypotenuse?

    [​IMG]
     

    Attached Files:

  5. Feb 13, 2008 #4
    I did Pythragoras to find the missing vector.

    (8000)^2 + (6000)^2 = c^2
    c=100 m/s

    tan[tex]\theta[/tex] = 6000/8000
    [tex]\theta[/tex] = 37

    I got 100 m/s for my velocity and 37 degrees N of W. Is this right?
     
  6. Feb 14, 2008 #5
    You know anythin about momentum conservation????
     
  7. Feb 14, 2008 #6

    PhanthomJay

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Yes, that is correct, but your diagram and equation are not consistent with this answer. Looks like you combined a step when solving for 'c' , and the direction of the diagonal is wrong.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Collisions problem
  1. Collisions problem! (Replies: 1)

  2. Ball Collision Problem (Replies: 12)

  3. Collision Problem (Replies: 3)

  4. Collision problem (Replies: 2)

  5. Collision problem (Replies: 5)

Loading...