Consider the structure shown below. Assume that the entire weight of the structure is resting at the two end points where the opposing forces have been labelled f1 and f2. Assume also that the rigid beams of the structure are made from a very light material so that their weight can be ignored. The angles indicated are all measured in degrees. Using the laws of statics, calculate the stress in each beam of the structure.
If you are not familiar with the laws of statics, here is all you need to know:
Be sure to note that you seem to have more equations than variables; this embarrassment of riches can cause problems.
Which of the beams experiences the greatest compression? How does shortening or lengthening this beam by a small amount change the stress which it undergoes, given the same design and weight load? Be careful here! Changing the length of one beam effect the lengths of some neighbouring beams as well. It is up to you exactly how to modify the design when changing the length of the beam.