1. The problem statement, all variables and given/known data A uniform thin rod of Length L and mass M is pivoted at one end is held horizontally and then released from rest. Assuming the pivot to be frictionless, find a) Angular velocity of the rod when it reaches its vertical position b) The force exerted by the pivot at this time c) Now we want to swing the rod 270° clockwise so that it will reach a vertical position at the top of its swing. What initial angular velocity is needed for the rod to achieve that? 2. Relevant equations Part a) Parallel-axis theorem Conservation of Energy Part b) ∑Fcm = mω2r Part c) Conservation of Energy? 3. The attempt at a solution I actually have no issues with parts A and B but only with C. My initial concept for C was to use the principle of COE Ugrav, 1 + Krotational, 1 = Ugrav, 2 but this was wrong. May I know what my concept for part c should be and why I was wrong in the first place? P.s. Apologies if this post was not well done, it's my first post and feedback is appreciated. Thanks!