the moment of inertia of a solid cylinder about an axis passing through its COM and parallel to its length is mr2/2 where r is the radius.
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mass moment of inertia for a solid sphere: I = (2 /5) * mass * radius2 (mass in kg, radius in metres)
Through the axis of the circular end it is MR2, but the middle of the cylinder length wise is (1/2)MR2 + (1/12)ML2
(1/2) mr2, assuming the axis of rotation goes through the center, and along the axis of symmetry.
A rotating body that spins about an external or internal axis (either fixed or unfixed) increase the moment of inertia.
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