The mass m, stiffness k, and natural frequency on, of an undamped SDF system are unknown....

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The mass m, stiffness k, and natural frequency on, of an undamped SDF system are unknown. These properties are to be determined by harmonic excitation tests. At an excitation frequency of 4 Hz, the response tends to increase without bound (i.e., a resonant condition). Next, a weight Aw = 5 lb is attached to the mass m and the resonance test is repeated. This time resonance occurs at f= 3 Hz. Determine the mass and the stiffness of the system. The mass m, stiffness k, and natural frequency on, of an undamped SDF system are unknown. These properties are to be determined by harmonic excitation tests. At an excitation frequency of 4 Hz, the response tends to increase without bound (i.e., a resonant condition). Next, a weight Aw = 5 lb is attached to the mass m and the resonance test is repeated. This time resonance occurs at f= 3 Hz. Determine the mass and the stiffness of the system.