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Math Help - mechanics help,

  1. #1
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    mechanics help,

    A woman and a man support a non-uniform plank, AB of mass 10kg and length 4m. The woman holds the plank 1m from A and the man holds the plank at B. The vertical reaction provided by the woman is 56N find;

    A) the vertical reaction force provided my the man

    b) The position at which at which the weight of the plank acts measured from A.
    Last edited by Tweety; December 29th 2008 at 05:36 AM.
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  2. #2
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    is this moments equation correct...

    taking moments about P ,

     2g \times 1m + 3g (xm-3m) =0 ?

    this gives x=2.3m and my book says the answer is  \frac{1}{3}
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  3. #3
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    Clarification needed

    Hi -

    Neither the diagram you attached nor the working you have given seem to apply to the same question. Please clarify what you want here.

    Grandad
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