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Problem $04\mathrm{.}037-$ Roller$-$peg supported T$-$bracket $-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL PARTS

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part. A $200-$lb overhead garage door consists of a uniform rectangular panel $AC,84$ in$.$ long, supported by the cable $AE$ attached at the middle of the upper edge of the door and by two sets of frictionless rollers at A and $B.$ Each set consists of two rollers located on either side of the door. The rollers A are free to move in horizontal channels, while the rollers $B$ are guided by vertical channels.