Q4. Undamped torsional vibrations (rotations back and forth) of a wheel attached to an elastic thin ro or wire are governed by the equation 100" + K0 = 0 where is the angle measured from the state of equilibrium. Find the angle as function of time i K/Io = 13.69 sec-2, initial angle 30° (0.5235 rad) and initial angular velocity 20° sec-1 (0.349 rad/sec) I -Fo

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