For the solid sphere $k=r\sqrt{\frac25}$ ;

For the hoop $k=\sqrt{\frac12R^2+\frac{1}{12}w^2}$ ;

For the solid cylinder $k=R\sqrt{\frac12}$ ;

For the solid sphere $k=r\sqrt{\frac25}$ ;

For the hoop $k=R\sqrt{\frac12}+w\sqrt{\frac{1}{12}}$ ;

For the solid cylinder $k=R\sqrt{\frac12}$ ;

For the solid sphere $k=r\sqrt{\frac23}$ ;

For the hoop $k=R\sqrt{\frac12}$ ;

For the solid cylinder $k=R$ ;

For the solid sphere $k=r\sqrt{\frac23}$ ;

For the hoop $k=\sqrt{\frac12R^2+\frac{1}{12}w^2}$ ;

For the solid cylinder $k=R\sqrt{\frac12}$ ;