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Double tension problem

  1. Feb 24, 2013 #1
    Im getting stuck on the fnet equation for the middle box. I dont really know where to start I can get the two fnet=ma equations for the boxes hanging and how do the boxes hanging on each side effect the system as a whole.
    Thanks I know this is most likely an easy question !
     

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  3. Feb 24, 2013 #2

    haruspex

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    The first thing is to figure out which way friction will act on the middle box.
    Post whatever you have.
     
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