Question: An SDF system is excited by a sinusoidal force. At resonance the amplitude of displacement was measured to be 4 cm . At an exciting

An SDF system is excited by a sinusoidal force. At resonance the amplitude of displacement was measured to be 4 cm. At an exciting frequency of one-tenth the natural frequency of the system, the displacement amplitude was measured to be 0.5 cm. Estimate the damping ratio of the system.

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