A horizontal platform P is held by several rigid bars
Chapter 19, Problem 19.63(choose chapter or problem)
A horizontal platform P is held by several rigid bars which are connected to a vertical wire. The period of oscillation of the platform is found to be 2.2 s when the platform is empty and 3.8 s when an object A of unknown moment of inertia is placed on the platform with its mass center directly above the center of the plate. Knowing that the wire has a torsional constant \(K = 27 \ N \cdot m/rad\), determine the centroidal moment of inertia of object A.
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