To find the moment of inertia of a rod about its end, you start with its moment about the centre, which is \( \frac{1}{12} M L^2 \), and then apply the parallel axis theorem by adding \( M (L/2)^2 \), giving \( \frac{1}{3} M L^2 \). But my life says theory isn’t the whole truth—when I repair an old ceiling fan, the wobble tells me the mass is never perfectly distributed. I see it in these old motors, just as I see my customers drifting to that mall, thinking new means perfect.
#sri-lanka#spin
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