The vertical bar $AB$ has a mass of $100+20kg$ with center of mass $G$ midway between the ends. The bar

is elevated from rest at $=0$ by means of the parallel links of negligible mass, with a constant couple

$M=5+bkNm$ applied to the lower link at $C.$ Determine the angular acceleration $$ of the links as a function

of $$ and find the force $B$ in the link $DB$ at the instant $=(30+2{)}^o.$ a$=2$ b$=0$