1. The problem statement, all variables and given/known data I require the a means to theoretically calculate the spring constant of a hollow tube. Essentially, I need to find the diameter of the glass pipette which will have a spring constant of 100 Newtons/metre. If someone could point me towards relevant information on calculating, or using software to find the solution it would be greatly appreciated. 2. Relevant equations This is what I need. I've been searching, but all I've been able to find are solutions based on spring geometry. 3. The attempt at a solution No idea.