Problem #$1[29$ pts$].$ The three blocks have weights of $W_A=60lb,W_B=20lb,$ and $W_C=40lb.$ If the coefficients of static friction at the surfaces of contact are ${}_{AB}=0\mathrm{.}4,{}_{BC}=0\mathrm{.}3,$ and ${}_{CD}=0\mathrm{.}2,$

$($a$)$ what is the tension in the cable, $T,$ just before motion occurs?

$($b$)$ Also, which block$($s$)$ will move first? $($Circle your answer$($s$),$ but show your work for full credit.$)$

Note that the angle between the cable and the dashed horizontal line is $45.$

$($a$)T=q,$

$($b$)$ Block A

Block B

Block C