The bar of weight W is pinned at its center O and connected to a torsional spring.

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The bar of weight W is pinned at its center O and connected to a torsional spring. The spring has a stiffness k, so that the torque developed is M = kθ. If the bar is released from rest when it is vertical at θ = 90°, determine its angular velocity at the instant θ = 0°. Use the prinicple of work and energy.image

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