Which rod has the smallest rotational inertia, I, the one rotating about the end, or the one rotating about the center?
A. Rotating about end
B. Rotating through center
C. They both have the same I, since they have the same mass and length
B. Rotating through center
The rotational inertia depends on the distribution of the mass. If
rotating about the center, more of the mass is closer to the axis of rotation, so the rotational inertia is smaller.
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