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!

Velocity of broken parts

  1. Sep 10, 2010 #1
    1. The problem statement, all variables and given/known data
    A plane of a mass 5000 kg moving horizontally in 150 m/s break in to two parts 2000 kg and 3000 kg because of a internal explosion. If the bigger part be thrown away with a 400 m/s relative to other part to opposite direction of previous moved direction before explosion, find the velocity of each part. [Ignore the air resistance]


    2. Relevant equations
    Conservation of momentum
    E=mv2/2


    3. The attempt at a solution

    I tried this, but I failed to do this one.

    I don't know this is right or wrong
    According to conservation of momentum

    5000 x 150 - 3000u = 5000 x (400 - 150) - 400 x 3000
    3(400 - u) = 50
    1200 -3u = 50
    1150 = 3u
    u = 383.6

    color black = Initial momentum of whole plane,
    color blue = Initial momentum of 3000 kg part
    color lime = final momentum of 3000 kg part
    color red = final velocity of whole plane

    The part in red or final velocity of whole plane. Is it right to take like that. I multiplied mass by the difference of initial velocity of plane and final velocity of 3000 kg part.

    Please help me to do this
     
  2. jcsd
  3. Sep 10, 2010 #2
    According to the answer script, the two velocities are 310 m/s and 90 m/s. My all tries are went wrong. I could not reach to this.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Velocity of broken parts
Loading...