$2$ Friday

$6\mathrm{.}1\mathrm{.}23.[$Level $2]$ A gear of radius $r_1($Body $1)$ rolls without slip along the inner radius of Body $2.$ The rigid link $\frac{?}{\text{b}\text{a}\text{r}}(OA)$ is restrained by a fixed pivot at $O.{}_{OA}=4$kra$\frac{d}{s}.r_1=0\mathrm{.}1$ m and $r_2=0\mathrm{.}3m.$ Find the angular velocity of Body $1$ and $v_B$ for the illustrated instant.

E$6\mathrm{.}1\mathrm{.}23$