Moment of inertia of solid hemisphere about OZ axis with flat surface on x-y plane and origin as the centre.

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To find the moment of inertia of solid hemisphere about OZ axis with flat surface on x-y plane and origin as the centre. Any hints will be appreciated.

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The mixed moments are zero because they all include a linear term in one of the two dimensions in which the hemisphere has reflectional symmetry.

The diagonal moments only contain quadratic terms, so for them the missing half doesn't affect the symmetry.

Thus all moments are just half the moments for a solid sphere of the same radius centred on the origin.