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Moment of inertia of a SOLID SPHERE is considered one the most difficult concept.
6 Questions around this concept.
Let I=Moment of inertia of a SOLID SPHERE about an axis through its centre
To calculate I
Consider a sphere of mass M, radius R and centre O. Mass per unit volume of the sphere =
Take an elementary disc of mass dm, whose centre is C and which lies between two planes perpendicular to the axis at a distance x and x + dx from its centre
Disc has Radius=AC and thickness =dx. As shown in figure
So,
So,
The moment of inertia of the elementary disc about the axis
Now integrate this dI between the limits x=-R to x=+R
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