1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

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

    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


    User Avatar
    Gold Member

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


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    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.


    Above is the same question with figure.

    Sorry for the confustion.

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook