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=2 R_1, the ratio of I_1…

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