The 10-Ib bar is pinned at its center O and connected to a torsional spring. The spring has a stiffness = 5 lb ft/rad, so that the torque developed is M = (5θ) lb ft, where 0 is in radians. If the bar is released from rest when it is vertical at θ = 90°, determine its angular velocity at the instant θ = 0°.
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