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Complex pulley system problem

  1. Oct 4, 2009 #1
    23jrcww.jpg

    my problem is the one shown above. In all honesty i do not know how this system works since a pulley with two radii's has two different cables running through it. Does anyone know where i need to start at with this problem?
     
  2. jcsd
  3. Oct 5, 2009 #2

    tiny-tim

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    Hi yopy! :smile:

    Hint: if A and B were at the same radius, then the tension in ropes 1 and 2 would be the same … can you see why?

    ok, now use the same principle to find the actual relationship between the tensions. :wink:
     
  4. Oct 5, 2009 #3

    rl.bhat

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    From he figure, I presume that pulleys 1 and 2 are combined one with radii 100 mm and h300 mm. If TA and TB are the tensions in rope A and B, then what should be the condition so that the pulley system 1 and 2 will remain in equilibrium?
    What should be the condition that the pulley 4 shall have neither rotational motion nor the translational motion.
     
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