Sample Problem $10\mathrm{.}10$ Newton's second law, r

Figure $10-19$a shows a uniform disk, with mass $\backslash ($ M$=2\mathrm{.}5\backslash$mathrm$\{$~kg$\}\backslash )$ and radius $\backslash ($ R$=20\backslash$mathrm$\{$~cm$\}\backslash ),$ mounted on a fixed horizontal axle. A block with mass $\backslash ($ m$=1\mathrm{.}2\backslash$mathrm$\{$~kg$\}\backslash )$ hangs from a massless cord that is wrapped around the rim of the disk. Find the acceleration of the falling block, the angular acceleration of the disk, and the tension in the cord. The cord does not slip, and there is no friction at the axle.