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Homework Help: Atwood machine problem (speed of mases after they have moved through 1.45 m)

  1. Apr 13, 2010 #1
    1. The problem statement, all variables and given/known data
    An Atwood machine has a mas of 2.50 Kg connected by a light string to a mass of 7.00 Kg over a pulley with a moment of inertia of 0.0652 kg m^2 and a radius of 11.3 cm. If the system is released from rest, what is the speed of the masses after they have moved 1.45 m? (Hint use conservation of energy, including translational & rotational kinetic energy.


    2. Relevant equations



    3. The attempt at a solution
    I set E(initial)=E(final)
     
  2. jcsd
  3. Apr 14, 2010 #2

    ehild

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    Homework Helper

    Show a picture of the set up. At what direction will the masses move after releasing them from rest? How do you calculate the initial and final energies?

    ehild
     
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