12.13. Model: The structure is a rigid body rotating about its center of mass. Visualize:We placed the origin of the coordinate system on the 300 g ball. Solve: First, we calculate the center of mass: cm(300 g)(0 cm)(600 g)(40 cm)26.67 cm300 g600 gx+==+Next, we will calculate the moment of inertia about the structure’s center of mass:
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