The discussion revolves around deriving the moment of inertia for a solid sphere, specifically questioning the applicability of a "pyramid" method, which is likened to slicing a watermelon. The original poster expresses uncertainty regarding the approach and the necessary elements for the calculation.
The discussion is ongoing, with participants providing insights into the proposed method and questioning its effectiveness. There is a recognition of confusion regarding the elements involved in the calculations, and some guidance is offered regarding alternative slicing methods.
Participants note that the original poster has not provided a detailed attempt at the problem, which is required by forum rules. There is also mention of differing opinions on the ease of the proposed method based on lecture content.
chocophysuny said:Can i use "pyramid" method to derive the equation of Moment Inertia solid sphere?
haruspex said:It doesn't seem to me that it would be a useful approach. It does not simplify anything. You need to slice it into elements that have an easily calculated MI, such as discs perpendicular to the axis of rotation.
Sunil Simha said:Hello chocophysuny,
Welcome to Physics Forums,
Have you tried it? You must show what you have tried to get help on PF (forum rules).
Sunil
chocophysuny said:"To find MI from the element, we need element of volume and element of MI, isn't it?"
chocophysuny said:But my lecture say this method is easy enough to solve.
And, actually i confused to find the element of volume and element of MI.
So, in your opinion, this is not solvable?