The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200rpm to 3120 in 16 seconds. The angular acceleration in $\mathrm{r}\mathrm{a}\mathrm{d}/{\mathrm{s}}^2$  is:

The position vector of 1kg object is $\overrightarrow{r}=\left(3\widehat{i}-\widehat{j}\right)m$ and its velocity $\overrightarrow{v}=\left(3\widehat{j}+\widehat{k}\right)m{s}^{-1}.$ The magnitude of is angular momentum is $\sqrt[]{x}Nm$  where x is________.

Match List – I with List – II

Choose the correct answer from the options given below:

A shell of mass $m$ is at rest initially. It explodes into three fragments having mass in the ratio $2:2:1$ . If the fragments having equal mass fly off along mutually perpendicular directions with speed $v$ , the speed of the third (lighter) fragment is :
<!-- [if !supportLineBreakNewLine]-->
<!--[endif]-->

The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is :

<!--[endif]-->

Two objects of mass $10\mathrm{k}\mathrm{g}$ and $20\mathrm{k}\mathrm{g}$ respectively are connected to the two ends of a rigid rod of length 10 $\mathrm{m}$ with negligible mass. The distance of the centre of mass of the system from the $10\mathrm{k}\mathrm{g}$  mass is :
<!-- [if !supportLineBreakNewLine]-->
<!--[endif]-->