This question is quite interesting: A uniform meter stick of mass M is pivoted on a hinge at one end and held horizontal by a spring with spring constant k attached at the other end. If the stick oscillates up and down slightly, what is it's frequency? The length of the stick is one meter. My thoughts: I believe I should write a torque equation about the hinge, but I am having difficulty doing that--- any suggestions? Also and I f=[(k/M)^.5]/2pi but the back of the book has 3k where I have k. I don't understand how they get this. Thanks a lot for your help! Also if you need a picture ill be happy to draw one out --- thanks again.