$[$Problem $2]$

$(25$ points$)$

For the mechanism$-$shown below,

$2\mathrm{.}1$ Redraw the mechanism to a scale of your choice

$(5$ points$)$

$2\mathrm{.}2$ given the velocities shown, draw the acceleration polygon

$(15$ points$)$

$2\mathrm{.}3$ Determine the magnitude and direction of angular acceleration of link # $6$

$(5$ points$)$

$r_{O_{2}A}=4\mathrm{.}0cm$;$,r_{AB}=9\mathrm{.}0cm$;$,r_{O_{4}B}=8\mathrm{.}0cm$

$r_{O_4{C}_4}=4\mathrm{.}0cm$;$r_{O_6{C}_6}=6\mathrm{.}0cm$

${}_2=45$;${}_2^{}=140rpmCW(constant)$

$v_{84}=25\frac{(cm)}{scc}$

${}_3^{}=\frac{v_{BA}}{r_{BA}}=\frac{58}{9\mathrm{.}0}=6\mathrm{.}4\frac{\text{r}\text{a}\text{d}}{sec}cW$

${}_4^{}=\frac{v_B}{r_{B{0}_4}}=\frac{62}{8}=7\mathrm{.}8\frac{\text{r}\text{a}\text{d}}{scc}cW$

${}_6^{}=\frac{v_8}{r_{{80}_6}}=\frac{40}{6\mathrm{.}0}=6\mathrm{.}7\frac{\text{r}\text{a}\text{d}}{sec}ccN$