Exercise 2.6.3: Take mx" + cx' + kx = Focos(wt). Fix m > 0, k > 0, and Fo > 0. Consider the function C(w). For what values of c (solve in terms of m, k, and Fo) will there be no practical resonance (that is, for what values of c is there no maximum of C(w) for a > 0)?
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