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3-D Statics

  1. Dec 14, 2007 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    everything is in static equilibrium

    3. The attempt at a solution

    well I know how to follow up to solution on these types of problems quite easily, however..on this one I can't seem to get started because I don't know where the weight of the of the pipe is located on the assembly...so

    1. i tried multiplying 20N/m by 6.5 (length of the pipe) I think that should give the value of the force

    2. I tried finding the centroid of the wire...but the centroid I found isn't even located on the pipe at all which really confused me

    so basically all I need to know is where this force is, so I could get started on the problem ...thanks

    Attached Files:

  2. jcsd
  3. Dec 15, 2007 #2


    Staff: Mentor

    That is actually correct. In this case the centroid is not located on the pipe. That can happen very often. Consider a disk, the centroid is the center of the disk. Now punch a hole in the center, the centroid is no longer on any material point of the ring.

    I would break the pipe into two separate segments and find the centroid of each segment individually. Those segment-wise centroids will be on the pipe. It adds some extra end-conditions at the bend in the pipe, but you know how to handle those already.
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