$($EP$,$ CH$11)$ A uniform solid disk of mass $m=3\mathrm{.}02kg$ and radius $r=0\mathrm{.}200m$ rotates about a fixed axis perpendicular to its face with angular frequency of $5\mathrm{.}97ra\frac{d}{s}.$ Calculate the magnitude of the angular momentum of the disk when the axis of rotation passes $($a$)$ through its center of mass and $($b$)$ through a point midway between the center and the rim.