Reaction forces on a structure

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Problem 4.36

The Attempt at a Solution

I am not sure if I am doing this correctly..there is a lot of information that I am not using to solve the problem (i.e. all the different distances, as well as the 30°. When determining the direction of a reaction force (Say A for example) do I just pick an arbitrary direction and if it comes out negative I know it's direction is opposite of what I put it as? I chose the moment at point A because I knew the moments of force A would be zero, leaving me with only the applied force and force E, which has a roller on it so it can only have a reaction force in one direction.

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• 4.36 attempt 1.pdf
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Can't open the first file, but based on your work:

Problem 4.36

The Attempt at a Solution

I am not sure if I am doing this correctly..
looks good
there is a lot of information that I am not using to solve the problem (i.e. all the different distances, as well as the 30°.
you don't need them if you are just looking for reactions
When determining the direction of a reaction force (Say A for example) do I just pick an arbitrary direction and if it comes out negative I know it's direction is opposite of what I put it as?
yes
I chose the moment at point A because I knew the moments of force A would be zero, leaving me with only the applied force and force E, which has a roller on it so it can only have a reaction force in one direction.
good!

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