1. The problem statement, all variables and given/known data I have that system and the problem says: A disk of mass M and radious R are posed are shown. The disk is hanging by an ideal rope which is coiled up. From a smooth axis through the center of the disk is haning a body m. Calclate the module of the aceleration of the center of mass of the disk. 2. Relevant equations 3. The attempt at a solution I've done this excercise but without the small mass hanging there. What I did was to use the torque and newton formulas, that simple. But here I've got two bodies and tensions are driving me crazy. Should I consider the bodies as a single one? Thanks!