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Homework Help: Friction and a pulley

  1. Mar 15, 2012 #1
    1. The problem statement, all variables and given/known data

    A system comprised blocks, a light frictionless pulley, and connecting ropes is shown in the figure. The 9.0-kg block is on a perfectly smooth horizontal table. The surfaces of the 12-kg block are rough, with \mu_k = 0.30 between the block and the table. If the 5.0-kg block accelerates downward when it is released, find its acceleration.

    the figure looks like this picture (except M= 5kg):

    14 minutes ago
    - 4 days left to answer.

    2. Relevant equations

    3. The attempt at a solution
    I want to say it is 1.6 m/s^s but I am not sure If I did it right.
    I just added the force friction to the force tension and then divided by the weights (9+5).
    Not sure if this is correct or not.
  2. jcsd
  3. Mar 15, 2012 #2
    Looks right to me.
  4. Mar 19, 2012 #3
    This is very similar to the earlier problem you asked.

    Use those equations to find the answer :-)
  5. Mar 20, 2012 #4
    EDIT: I was doing this question wrong earlier, refer to emailanmol's posts in your other thread.
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