Analyzing the Angular Simple Harmonic Motion of a Water-Filled Swinging Sphere

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A water-filled swinging sphere possesses moment of inertia, allowing it to be analyzed as an approximate case of angular simple harmonic motion. However, the rotation of the sphere can be significantly hindered by the water inside, affecting its motion. The discussion raises questions about the role of viscosity in this context, suggesting it may play a part in the water's resistance to motion. Participants express differing views on the extent to which water impacts the sphere's dynamics. Understanding these factors is crucial for accurate analysis of the system's behavior.
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If all things have moment of inertia then a swinging sphere with water filled must have moment inertia too? Then can we analyse it as an approximate case of angular simple harmonic motion?
 
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Sure. Just don't forget that if you rotate the sphere, the water will heavily impede the rotation.
 
ideasrule said:
Sure. Just don't forget that if you rotate the sphere, the water will heavily impede the rotation.

I can't see how water will impede motion.
Anything to do with viscosity?
 
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