Hi everybody. I'm a newbie here. I'm a Physics student at University of São Paulo in Brazil (I'm in 1st year) and find this forum was a very nice surprise for me. I think this is the best thing about Physics in all web and I would like give all of you my congratulations. Well, my doubt is about Moment of Inertia. I need calculate the moment of inertia for a conic disc with a hole in the center according the figure below. I made several searches on Internet and didn't find nothing about this. The diametral section of the ring is like following: http://img178.imageshack.us/img178/7999/discocnico013ai.jpg [Broken] Thank you very much.