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Homework Help: Help with frames physics

  1. Dec 1, 2008 #1
    1. The problem statement, all variables and given/known data
    Two 10-inch diameter pipes (pipe 1 and pipe2) are supported every 10ft by a small frame like the one shown. Knowing that the combined weight per unit length of each pipe and its contents is 22 lb/ft and assuming frictionless surfaces, determine the components of the reactions at A and E.

    attachment.php?attachmentid=16677&d=1228194586.jpg


    2. Relevant equations



    3. The attempt at a solution
    first id like to make sure im doing the weight of the pipe correctly:

    Wboth = (22 lb/ft)(10ft) = 220lb. W1 = W2 = 110lbs

    now that its all typed out i think i know what to do, but just correct me if im wrong. i can get the verticle forces of A and E by finding the moment of the entire frame and setting it to 0. (the only forces involved are the weight of both pipes. A and E counter act it to make a moment of 0)
    Then i can find all forces acting on Pipe 2, which is pipe 1, the pole and gravity pulling it down.
    Then i find the forces acting on Pipe 1 which is pipe 2, both poles, and gravity.
    Then i find the moment about the brown dot for each pole individually to find the horrizontal forces of A and E


    edit: and also i beleive the horizontal distance from the brown dot to where pipe 2 makes contact with the pole is 1.5rsin(theta)
    the horizontal distance of pipe 1 is just rsin(theta).
     

    Attached Files:

    Last edited: Dec 1, 2008
  2. jcsd
  3. Dec 2, 2008 #2
    Re: Frames

    ok nevermind, i just went through this problem and got the same answer they had in the book. its kind of annoying, thats like the 3rd problem this week where i figured it out as i was finished typing everything up and drawing the picture lol
     
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