Question: (a) Show that if a structure contains all unit masses and bars with unit stiffness, c1 = 1. Then its frequencies of vibration are the

(a) Show that if a structure contains all unit masses and bars with unit stiffness, c1 = 1. Then its frequencies of vibration are the nonzero singular values of the reduced incidence matrix.
(b) How would you recognize when a structure is close to being unstable?

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