I think I did this problem correctly however I am not 100% sure. Unfortunatley the Dynamics book that I have only gives answers to even numbered problems and I cannot check me work. Anyway here is the problem from the book. The smooth circular bar rotates with constant angular velocity about the vertical axis AB. The radius R = 0.5 m The mass m remains stationary relative to the circular bar at an angle of 40 degrees. Determine the angular velocity. Here is my work: https://www.physicsforums.com/attachment.php?attachmentid=2510&stc=1 My answer just in case you can't read it is 3.877 rad/s. Thanks!