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Beam and magnitude.

  1. Sep 18, 2012 #1
    1. The problem statement, all variables and given/known data

    As shown, a roller at point A and a pin at point B support a uniform beam that has a mass 25.0 kg . The beam is subjected to the forces f1 = 50.0N and f2= 79.0N . The dimensions are l1= 0.750m and l2= 2.30m . (Figure 2) What are the magnitudes and of the reaction forces and at points A and B, respectively? The beam's height and width are negligible.

    Please see attachment for figure.


    2. Relevant equations



    3. The attempt at a solution

    (79*cos(15)*3.05)+(50*0.75) = Rb *3.05
    Rb=88.6

    Ra * sin(53.13010)*3.05 = 50*2.3
    Ra=47.1311

    I am not sure if this is how you do this type of question..?
    Also the answers are not correct as when I go to see if they are correct they come back as incorrect. The ansers i have tryed which are incorrect are, Fa = 47.1 Fb=88.6
     
  2. jcsd
  3. Sep 18, 2012 #2

    phinds

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    Uh ... what attached figure is that ?
     
  4. Sep 18, 2012 #3

    SammyS

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    There is no attached figure.
     
  5. Sep 18, 2012 #4
    It says that I have already uploaded the image. I have also posted this question in a different forum. Can you please have a look at this one.

    https://www.physicsforums.com/showthread.php?t=637033

    Above is the same question with figure.

    Sorry for the confustion.

    Thanks
     
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