8 A periodic external force acts on a 6 kg mass suspended from the lower end of a vertical spring of force constant 150 Nm The

Question

8 A periodic external force acts on a 6 kg mass suspended from the lower end of a vertical spring of force constant 150 Nm The damping force is proportional to the instantaneous speed of the mass and is 80 N when speed is 2 ms calculate the resonance frequency 1

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