1. The problem statement, all variables and given/known data A cylinder having a mass of 5.0 kg can rotate about its central axis through point O. Forces are applied as shown in the figure: F1 = 5.0 N, F2 = 6.0 N, F3 = 2.5 N, and F4 = 5.5 N. Also, R1 = 6.5 cm and R2 = 12.0 cm. Find the magnitude and direction of the angular acceleration of the cylinder. (Take clockwise to be +.) (During the rotation, the forces maintain their same angles relative to the cylinder.) 2. Relevant equations τ=I⋅α=r⋅F⋅sinΦ Icyl = ½MR2 3. The attempt at a solution So I started with τnet=F2⋅R1 - F1⋅R2 + F4⋅0 and τ=Iα , so F2+R1 - F1⋅R2=Iα. Substituting in I: F2⋅R1 - F1⋅R2=½MR2α Solved for α to get 2[F2⋅R1 - F1⋅R2 ]/MR2=α Plugging and chugging I got: 2[(6.0N-5.0N)(0.12m)+(2.5N)(0.065m)]/(5.0kg)(0.12m)2=α α=0.94 rad/s2 But this isn't correct. Can you help me figure out what I'm doing wrong? Thanks!