use an initial angular velocity of $5$ rad$/$s $($hint: when they're upright, treat the rods as particles when calculating their angular momentum$)$

$*19-36.$ Each of the two slender rods and the disk have the same mass $m.$ Also, the length of each rod is equal to the diameter $d$ of the disk. If the assembly is rotating with an angular velocity ${}_1$ when the rods are directed outward, determine the angular velocity of the assembly if by internal means the rods are brought to an upright vertical position.