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Pulley-related question.

  1. Nov 11, 2009 #1
    Cylinder A in following figure rolls 5m down the slope. What distance is mass B lifted?
    ( Ans. SB= 10 m )

    pulley.jpg

    circumference of circle = πd = (3.14)(1.2) = 3.77

    Not sure what to do next. I tried Pythagoras theorem, although it's probably not needed.

    Please help.
     
  2. jcsd
  3. Nov 11, 2009 #2

    ideasrule

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    Homework Helper

    So the rope winds around the cylinder while the cylinder is moving down the hill. Suppose the rope doesn't wind around the cylinder. By how much would B be lifted? By how much does the cylinder rotate after it rolls 5 m downhill? Add the two distances together and you get 10 m.
     
  4. Nov 11, 2009 #3
    Thanks man. It makes perfect sense to me now.
     
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