Answers to selected questions (click "SHOW MORE"): 1b2c Contact info: @ What's new in 2015? 1. Closed-caption made by myself! -- not the automatic subtitle anymore. 2. Learning objectives added for each video. 3. Quiz questions added -- including end-of assessment questions and preparatory, exploratory questions. 4. Mistakes fixed and cleaned up. 5. New examples/contents for selective videos. My old videos and playlists will still be left on YouTube. Feel free to watch either one. Personally I think the revised videos are better mainly because of the subtitle. Learning objective of this video: To explain the analysis and demonstrate the problem-solving strategy involving rigid body planar motion – rotation about a fixed axis.