Problem statement
Solution video
DISCUSSION THREAD
NOTICE: Theta = 30 degree
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HOMEWORK 21.B - SP 24
6 thoughts on “HOMEWORK 21.B - SP 24”
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Are we expected to solve in terms of theta? Or is there a method to determine theta?
I'm guessing the reason that it was not originally given is that it is not important to solving the problem, so by adding it is making it more confusing. Just commenting this because it being added really messed up my problem solving when I tried to incorporate it. Even if it may be given, it should not affect the outcome of the problem.
That is to say, what is important here are the triangles and corresponding angles within the truss.
I think you can solve most of the forces without knowing theta, but a value of theta is required at least to find the reaction forces at points A and B. From the figure, you might assume the surface roller A sits on is parallel to the diagonal members of the truss, which would make the problem solvable, but since a different value of theta is given you should use that instead.
follow-up to that, would we need to always have theta or could we convert it to radians if it helps calculations.
I am getting 2 different answers when solving for CH when looking at it from joint H or joint C. What could be the reason?