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amplitude and phase of Driven harmoic oscillators

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1. Driven harmoic oscillators
Suppose that a driven harmoic oscillators with belta = 1/3w0 is driven with force F = F0cos(wt) with driven frequency w = 1/3w0.
Find the amplitude 'D' and phase a of the motino x(t) = Dcos(wt- a). expressing them purely in terms of F0, k and numerical constants.

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It finds the expressions for the amplitude and phase of Driven harmoic oscillator driven with force F =F0cos(wt). The solution is detailed and has a '5/5' rating.

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