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Question

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=12πkMfn=12π460005=15.26Hz

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