What value of psi will system be in state of pure resonance

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A mass weighing 4 pounds stretches a spring 18 inches. A periodic force equal to f(t) = cos ψt + sin ψt is impressed on the system starting at t = 0. In the absence of a damping force, for what value of ψ will the system be in a state of pure resonance?

Reference no: EM13999088

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