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- Wikipedia's article on vibration: https://en.wikipedia.org/wiki/Vibration
- Dr. Anil V. Rao's lecture notes (like a textbook) on mechanical vibrations: http://vdol.mae.ufl.edu/CourseNotes/EML4220/vibrations.pdf
- MIT OpenCourseWare Lecture on Lagrange's method: https://ocw.mit.edu/courses/aeronautics-and-astronautics/16-07-dynamics-fall-2009/lecture-notes/MIT16_07F09_Lec20.pdf
Media
- [Video] Finding the Center of Percussion of a baseball bat: https://youtu.be/Dw3UpKQVhVY
- [Video] The sweet spot of a baseball bat: http://phys-webapps.csuchico.edu/baseball/DrBaseball/SweetSpot
- [Video] CH-47 Ground Resonance Test: https://youtu.be/a4EvVR10AF0
- [Video] Tuning a Guitar Using Beats: https://www.youtube.com/watch?v=srNqPEJJCLU
- [Video] Stanford Introduction to Mechanical Vibrations Lecture: https://www.youtube.com/watch?v=9_d8CQrCYUw
- [Course] Mechanical Vibrations Course from IIT Guwahati: https://cosmolearning.org/courses/mechanical-vibrations-537/
- [Course] Mechanical Vibrations Course from University of Louisiana Lafayette (includes Jupyter notebooks): http://www.ucs.louisiana.edu/~jev9637/MCHE485.html