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A,B,C and D are 4 beams what beam we can change it to chain and this system till

  1. Mar 12, 2012 #1
    1. The problem statement, all variables and given/known data

    http://data.imagup.com/10/1146211599.jpg

    A,B,C and D are 4 beams ..what beam we can change it to chain and this system till stay work perfectly?
     
  2. jcsd
  3. Mar 12, 2012 #2

    tiny-tim

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    hi zizodev! :wink:

    tell us what you think, and then we'll comment! :smile:

    (and are the beams hinged, or rigidly jointed?)
     
  4. Mar 12, 2012 #3
    Re: A,B,C and D are 4 beams ..what beam we can change it to chain and this system t

    emm..i think rigidly jointed and for me the changeable one is C..isn't..let me know the 2 case (for the beams hinged and rigidly jointed)
    thank you tiny-tim in advance.:)
     
  5. Mar 12, 2012 #4

    tiny-tim

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    hi zizodev! :smile:
    give a reason! :rolleyes:

    (when can you replace a beam by a chain? :wink:)
     
  6. Mar 13, 2012 #5
    Re: A,B,C and D are 4 beams ..what beam we can change it to chain and this system t

    i have chosen C because i felt that this is less important !! and i haven't no idea about mechanical design. about mechanical strengths etc...
     
  7. Mar 13, 2012 #6

    tiny-tim

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    a beam can have either tension or compression

    a chain can only have tension

    (you can't push a chain, can you? :biggrin:)

    so a chain can only replace a beam in tension

    so you'll need to prove: which beams are in tension? :smile:
     
  8. Mar 13, 2012 #7
    Re: A,B,C and D are 4 beams ..what beam we can change it to chain and this system t

    the B are in tension i think..:)
     
  9. Mar 13, 2012 #8

    tiny-tim

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    yes, but the difficulty is that if you replace B by a chain, what is there to stop A falling? :wink:
     
  10. Mar 13, 2012 #9
    Re: A,B,C and D are 4 beams ..what beam we can change it to chain and this system t

    hahah...so the final answer will be C ....thnks again tiny-tim
     
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