A mass of 5 kg is suspended from a spring of stiffness 46 kN/m. A dashpot is fitted between the mass and the support with a damping ratio of 0.3. Calculate the undamped frequency.
A
15.56 Hz
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B
15.26 Hz
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C
15.44 Hz
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D
15.34 Hz
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Solution
The correct option is B 15.26 Hz The natural undamped frequency is given by fn=12π√kM⇒fn=12π√460005=15.26Hz