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  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

prex's latest activity

  • prex
    prex replied to the thread Theoretical Question - Planar Truss Problem.
    There's a quite simple proof of the original problem statement. As this proof is based on simmetry, it proves also that the same...
  • prex
    prex replied to the thread Calculating welds - Second moment of area.
    The second moment of area, as the word iteself says, is area x distance squared. Pls post this kind of questions in the students forum
  • prex
    prex replied to the thread Thick Walled Cylinder Question.
    sigma_theta+sigma_r is not almost constant, it is exactly constant. To me the elongation due to end pressure only is 30 in, the...
  • prex
    prex replied to the thread Thick Walled Cylinder Question.
    If you look at your equations, you'll find that sigmatheta+sigmar=const, so the longitudinal elongation (negative, it is a contraction)...
  • prex
    prex replied to the thread The physics of Bungee Jumping.
    Sorry guys, I need to make amends. I now see where is the point: Newton's law only holds, for an isolated system, if the mass in F=ma...
  • prex
    prex replied to the thread The physics of Bungee Jumping.
    btrue, I fully respect civil engineers, but I am not one of them. ;) And an inextensible chain is not that unreal, we engineers should...
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