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  1. JonnyRotten

    Child car seat safety feature

    Hi Folks, I'm not sure if i am posting this in the correct place so apologies if I'm not. I have recently purchased a Cybex Aton Q infant car seat as per the attached photo. It has a safety feature that I just can't quite get on board with. You are supposed to extend the telescopic rod (Or...
  2. JonnyRotten

    Thermal Expansion of a trapped fluid with a piston and air chamber

    hi Folks, I was hoping for some help in a calculation. I have a cylinder with closed ends and a floating piston in the middle. On one side of the piston I have a fluid and on the other side I have air. I will be heating up the cylinder and I would like to calculate how far the piston would...
  3. JonnyRotten

    basic opposing springs question

    Hi folks, I'm sure this is a simple question but here goes. I have a plate with 2 coil springs, 1 pushing from each side of the plate. Each with a force of 5Lbs. So the plate is at equilibrium. For argumments sake, lets say each spring is identical with a spring rate of 1Lb/in. If i then add an...
  4. JonnyRotten

    second moment of area

    Is it possible to calculate the second moment of area of a shape with autocad LT 2006?
  5. JonnyRotten

    Calculating the second moment of area

    Hi, Basically i am trying to calculate the load required to deflect the finger of a collet. Its a pipe with slots milled along its length and these fingers will deflect when the collet is inserted into another pipe. So the finger is sort of circular in cross-section. I'm finding it hard to...

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