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Homework Help: Tension in ropes w/o acceleration or friction

  1. Oct 7, 2012 #1
    1. The problem statement, all variables and given/known data

    Two blocks are connected by a massless string and are held in position by another massless string along a frictionless incline (as shown in the figure). Let M1 = 11.0 kg, M2 = 67.0 kg, and theta = 39°.

    Calculate the tension in the string connecting the two blocks.

    What is the tension in the string which connects mass M2 to the wall?

    2. Relevant equations

    3. The attempt at a solution
    What objects am I suppose to look at? All I found was force of the x and y components of each block
  2. jcsd
  3. Oct 7, 2012 #2
    (M1+M2)g sin(39)=Tension connecting M2 to the wall. <---Because the string have to support two weights at and angle.
    (M1)g sin(39)=Tension connecting M1 to M2. <--- Because the string only supports one weight at an angle
  4. Oct 7, 2012 #3
    Thank-you. It worked! I got confused with which one was m1 and which one was m2... Stupid me :/
    Last edited: Oct 7, 2012
  5. Oct 7, 2012 #4
    eh? (67+11)9.8 sin(39) is for the string connecting M2 to wall
    and for the second equation, its not 67 but 11. so, 11(9.8) sin39
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