What is the spring constant of wood and how can it be determined?

VitaminA
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Homework Statement



I'm modelling a plank of wood as a number of masses connected by springs. I need to know the spring constant of wood, but I am unable to find it and I'm not sure how to work it out?
 
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"wood" is a hugely variable quantity. Do you mean balsa wood or ironwood?
 
Let's go with oak?
 
I'm not trying to be a smart-*** here, but there are, depending on what source you believe, somewhere between 600 and 900 species in the genus Quercus that are all oaks and easily dozens of those produce wood that is commercially available.

What is a "spring constant"? How is it defined?
 
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This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
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The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
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