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Determine the resultant couple moment

  1. Sep 24, 2015 #1
    1. The problem statement, all variables and given/known data

    4-70 Two couples act on the beam. If F=125 lb. determine the resultant couple moment.
    media%2F385%2F3854ab81-8861-4c80-a860-cad551f28f07%2FphpFDUPHk.png
    2. Relevant equations

    M=Fd

    3. The attempt at a solution
    I know CW is + and CCW is - ...and that is determined in the final answer,
    I know the solution is taking Forces times the distance, the solution is M=(200*1.5)+(125cos30*1.25)

    question is why are they both positive? when do we consider taking negative instead positive? i've seen other solutions for other questions, where they take negative ... im confused when to take negative or position... so why not -200 or -125
     
    Last edited: Sep 24, 2015
  2. jcsd
  3. Sep 24, 2015 #2

    SteamKing

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    Are you sure your textbook doesn't explain this? Like mentioning the right hand rule?
     
  4. Sep 24, 2015 #3
    it didnt, otherwise i wouldnt ask here... you could have did me favor and explained rather than asking me a non sense question.. thank you anyways.
     
  5. Sep 24, 2015 #4

    SteamKing

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    I dropped a rather big hint.

    https://en.wikipedia.org/wiki/Right-hand_rule
     
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