The assembly is constructed of homogeneous slender rod which has a mass per unit length, and

The assembly is constructed of homogeneous slender rod which has a mass ρ per unit length, and it rotates freely about a horizontal axis through the pivot at O. If the assembly is nudged from the starting position shown, determine its angular velocity after it has rotated 

(a) 45°, 

(b) 90°, 

(c) 180°.

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