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Homework Help: 3 blocks on an incline forces

  1. Nov 5, 2008 #1
    1. The problem statement, all variables and given/known data
    Three blocks of masses 10kg, 5kg, and 3.090 kg are connected by light strings that pass over frictionless pulleys as shown. The acceleration of the 5kg block is 2m/s^2 to the left, and the surfaces are rough. Find the tensions in each string and the coefficient of friction btw the blocks and the surfaces assuming it is the same for both blocks.

    Here is my picture and equations. I assumed that the acceleration would be 2 m/s^2 for all three blocks.


    The issue I have is that no matter how many times I try the problem, I end up with a different friction coefficient than the answer my teacher gave me of 0.66. Can someone tell me what I'm doing wrong?
  2. jcsd
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