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Homework Help: Inelastic collision of a projectile with a pendulum

  1. Jan 28, 2009 #1
    1. The problem statement, all variables and given/known data
    a 20 kg wood ball hangs from a 2.0 m long wire. the maximum tension the wire can withstand without breaking is 400 n. a 1.0 kg projectile traveling horizontally hit and embeds itself in a the wood ball. what is the largest speed this projectile can have without causing the cable to break
    2. Relevant equations

    3. The attempt at a solution
    im kind of stumped with this one
    some help would really be appreaciated :)
  2. jcsd
  3. Jan 28, 2009 #2


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    hint - centrifugal force for the tension in the wire, conservation of energy for the speed
  4. Jan 28, 2009 #3
    im having problems dealing with the angle of the pendulum as it spins
    if we have the y axis in the direction of centrifugal force the sum of the forces would be:
    ma = 400N - mgCos(angle)
    could i consider the ball when its at a 90 degree angle to get rid of that thing
    and at what point in the rotation would the maximum tension occur at anyways?
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