Physics - Rotation Question with Solution | TestHub

The moment of inertia of the disc about the centroidal axis is $\frac{m{r}^2}{2}$ The moment of inertia of the disc at A about the axis passing through B is given using the parallel axis theorem as $\frac{m{r}^2}{2}+m(2r{)}^2$ Thus, the total moment of inertia of the whole system is given as $\frac{m{r}^2}{2}+\frac{m{r}^2}{2}+m(2r{)}^2=5m{r}^2$