Physics - Rotation Question with Solution | TestHub

Two iron solid discs of negligible thickness have radii $R_1$ and $R_2$ and moment of intertia $I_1$ and $I_2$, respectively. For $R_2=2R_1$, the ratio of $I_1$ and $I_2$ would be $1/x$, where $\mathrm{x}=$ ________ -