1. The problem statement, all variables and given/known data http://img833.imageshack.us/img833/9638/coisadovitor.jpg [Broken] You have all the freedom to make any assumption to solve the problem. All 3 kinds of movement must be considered (roll, sway, heave). Variables are up to you. 2. Relevant equations 3. The attempt at a solution I tried to solve it by considering it an harmonic system.