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Homework Help: Elastic Collision

  1. Feb 9, 2010 #1
    NONElastic Collision

    1. The problem statement, all variables and given/known data

    One sphere collides with other sphere that has speed of u2 = 0... Both spheres have same mass (m1 = m2 = 0.3 kg)... After collision first sphere has speed of v1 = 0.6 m/s, second sphere v2 = 1.1 m/s ... How much of kinetic energy has been transformed into heat

    2. Relevant equations

    Ek= (m1 * u1 ^2) / 2

    m1u1 + m2u2 = m1v1 + m2v2

    3. The attempt at a solution

    from second formula i got u1 = 1.7 m/s

    and after doing Ek = Ek1 + Ek2 + heat,

    heat = Ek - Ek1 + Ek2
    heat = 0.2 J

    Can anybody confirm this...7
    Last edited: Feb 9, 2010
  2. jcsd
  3. Feb 9, 2010 #2
  4. Feb 9, 2010 #3
    yeah i know... elastic collision do not transfer heat and stuff...

    so it will be 0

    BUT proffesor told my GF (she took that exam) that there is solution and it's not 0

    dunno how, but I guess then he meant nonelastic but wrote elastic......
  5. Feb 9, 2010 #4
    Here... I will edit it...
  6. Feb 9, 2010 #5
    Well if the collision is inelastic, I get the same answer as you do, to 2 sig fig. As long as it isn't a trick question!
  7. Feb 9, 2010 #6
    If it was for me, i wouldn't ask here... but this is girls be or not be exam...

    Any more thoughts?
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