Solid Mechanics questions - A new challenge :) Hi all I got 3 new questions that need to be solved in about 3-4 days as part of a 'challenge' homework. Those who solve correctly will basically get their names read out loud on the next lecture but I do it to understand the material of the course First Question: http://up185.siz.co.il/up3/n2i5uwddmczo.jpg [Broken] I first tried to write all that I think that has to do with the questions, expressions that I learned and think that I'll use. Then I thought of first expressing E1111 but then I figured there's no need to. How do I express E'1111 ? do I use the last formula (transition formula) first?