5.55 by Paul is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

# 5.55

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5.55 by Paul is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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where can we find a step by step walk through to get the eigenvalues and eigenvectors of a 3x3 matrix?

Problem 3.52 (10th edition) goes through a 3x3 system giving due consideration to each of the steps.

where did you get the equation for k?

The relation for finding the torsional stiffness of a beam is found in the textbook. In the tenth edition you should look for Equation 5.41.

5.72 in 11th edition