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Homework Help: Determine the moment of this force

  1. Feb 26, 2009 #1
    1. The problem statement, all variables and given/known data
    The total hip replacement is subjected to a force of F = 120N.
    Determine the moment of this force about the neck at A and at the stem B

    2. Relevant equations

    M = r X F

    3. The attempt at a solution

    ...
     

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  2. jcsd
  3. Feb 26, 2009 #2
    Re: Statics(Moment)

    So, .... where is your work?
     
  4. Feb 27, 2009 #3

    tiny-tim

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    Welcome to PF!

    Hi yosheey ! Welcome to PF! :wink:

    Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
  5. Oct 18, 2010 #4
    Re: Statics(Moment)

    Hi! I am stuck on this problem too, is there anyone that would mind showing me how to do it? My group and I are stuck.
     
    Last edited: Oct 18, 2010
  6. Oct 19, 2010 #5

    tiny-tim

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    welcome to pf!

    hi jining! welcome to pf! :smile:

    (you know what i'm going to say, don't you? :wink: …)

    Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
  7. Oct 19, 2010 #6
    Re: Statics(Moment)

    Hello! Thanks!

    Um, so I managed to get the moment about a, but I don't know what to do for b

    http://imgur.com/Wx939
     
  8. Oct 19, 2010 #7

    tiny-tim

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    hello jining! :smile:

    yes, your moment about A looks fine (you drew that 5° really large … good idea! :biggrin:)

    for the moment about B, do it the same way, extending that 15° line until it gets near B …

    but of course you need to know how far down B is, and the question doesn't tell you :confused:
     
  9. Oct 19, 2010 #8
    Re: Statics(Moment)

    Yea... :| thats where im stuck haha .. any ideas? Thanks for the help.
     
  10. Oct 19, 2010 #9

    tiny-tim

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    oh i see now, i wasn't looking at the diagram properly :redface:

    you can find how far that 150° point is to the right, then use the 10° to find how far down it is from there to B :wink:
     
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