Recent content by dhume878

I appreciate the response after 8 years. This was the question of a young academic, which has since been solved, published, and laid to rest. However I would point people toward the wiki article on rotation matrices as opposed to orthogonality wrt to the relevance of the question...

The square is not rigid, I think that is the fact that is confusing me. The points A,B,C,D are not pinned, they are fixed via some kind of joint (to represent a more complex joint). So A - D can fail given some moment or max force, and I want to analyze the system to ensure that those values...

Homework Statement There isn't really a problem statement. This is for something I am myself designing but I'm struggling conceptually with the basic statics analysis. It's a simple square truss. If I were to write a problem statement it would be "What are the reaction forces at A and B?" My...

:rolleyes: Actually it was my mistake I typed in the numbers incorrectly. [PLAIN]http://j.drhu.me/2011-02-03_1426.png dot = 0 as well. Annnnddd, I believe the matrix I was referring to as L .. is just my rotation matrix and I should be able to multiply it by a point, and get that...

I feel I may have improperly posted this thread https://www.physicsforums.com/showthread.php?t=469331" but am just not as knowledgeable in my matrix math as I need to be. One (me) would think that somehow you should be able to get a rotation matrix from these two systems. Homework Statement So...

Hey everyone, I'm working on my degree and have started getting into some deeper lin alg than I took previously regarding coordinate system transformations. I was hoping someone might be able to shed some light on it for me. I'll do my best to explain the problem .. I have a global...