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Related Rates of Accelerations in Pulley Problem

  1. Sep 4, 2016 #1
    1. The problem statement, all variables and given/known data
    Hi!
    I am new to this forum and i have problem understanding sample problem 13.5 from Vector Mechanics for Engineers 10th edition Statics and dynamics. (Beer)
    In particular I don't understant in part b how he comes to the assumption aC=-1/2aD

    If anyone can help
    thanks

    2. Relevant equations
    Uniform motion: ∑Fy=0
    Accelerated Motion: ∑Fy=ma

    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Sep 4, 2016 #2

    Doc Al

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    Staff: Mentor

    If D raises by one unit of distance, by how many units must C lower? (Take a piece of string and play with it.)
     
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