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Homework Help: Determine the force in a pulley system

  1. Nov 14, 2016 #1
    1. The problem statement, all variables and given/known data
    If A has a mass of 300kg, determine the mass of B if the system in figure P4-28 is to be in balance.
    (What I couldn't understand is the 2Tb in the answer.)

    2. Relevant equations

    3. The attempt at a solution
    Since the pulley on top is connected with two pulley at the bottom, its force is doubled?
  2. jcsd
  3. Nov 14, 2016 #2


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    Staff: Mentor

    The middle pulley (above block B) has two tensions Tb pulling it downward (red string in figure below). So what must be the tension in the blue string?

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