a metallic disc is melted and casted it into a solid sphere its moment of inertia about its Axis through its Centre will be
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The one with the smallest ratio between the moment of inertia about its axis of rotation and is mass. The reason is that would be the one tying up the least kinetic energy in its rotation. Since moment of inertia is larger in objects whose mass is distributed farther from their centers of mass, and since the solid sphere best distributes its mass nearer the axis of rotation, it must arrive
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