Question $2$: Figure $2$ shows a quick return mechanism. The driving of working $($cutting$)$ stroke to return stroke is to be $1\mathrm{.}6.$ If the len crank $OA$ is $100$ mm long and the time ratio Answer the following questions based on the given information.

a$)$ Determine the center distance, $d$

b$)$ The length of the lever, $CB$

$3-194$ A $4-$m$-$high and $6-$m$-$long wall is constructed of two large $0\mathrm{.}8-cm-$thick steel plates $)=(15\frac{W}{m}*K$ separated by $1-cm-$thick and $22-cm-$wide steel bars placed $99$ cm apart. The remaining space between the steel plates is filled with fiberglass insulation $(k=0\mathrm{.}035\frac{W}{m}*K).$ If the temperature difference between the inner and the outer surfaces of the walls is $22C,$ determine the rate of heat transfer through the wall. Can we ignore the steel bars between the plates in heat transfer analysis since they occupy only $1$ percent of the heat transfer surface area?