1. The problem statement, all variables and given/known data A string is wrapped around a uniform solid cylinder of radius r, as shown in (Figure 1) . The cylinder can rotate freely about its axis. The loose end of the string is attached to a block. The block and cylinder each have mass m. Find the magnitude α of the angular acceleration of the cylinder as the block descends. 2. Relevant equations F=ma=mg-T Torque=Iα=-Tr a=-rα I=mr2/2 3. The attempt at a solution I use these three equations to eliminate T and solve for α. m(-rα)=mg-T -1/2mr=T -mrα=mg+1/2mr -α=g/r+1/2 α=-1/2-g/r I tried this answer however it was wrong. Mastering says the correct answer is α = 2g/3r I'm really not sure where this comes from, so any help would be great! I need to understand where I went wrong.