[SOLVED] Angular and Tangential Variables 1. The problem statement, all variables and given/known data A thin rod (length = 1.5m) is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod may be ignored, compared to the mass of the object fixed to the top if the rod. The rod, starting from rest, tips over and rotates downward. (a) What is the angular speed of the rod just before it strikes the floor? (Hint: consider using the principle of conservation of mechanical energy.) (b) What is the magnitude of the angular acceleration of the rod just before it strikes the floor? 2. Relevant equations Possibly... w=vt mgh = 1/2 mv2 v=st ? 3. The attempt at a solution I'm really having trouble even setting this one up. I drew a picture of the setup, I know the bar is initially at rest. I'm completely lost on how to even go about it. I've tried the PE=KE equation and canceled out the mass variable which gives me v = 5.4, then I plugged that velocity into the w=vt using a time I got from using 1/2gt2 but that shouldn't really work as its not a free fall problem I think. Any ideas on how to setup the problem? I think I can figure it out if I can just wrap my brain around the proper setup. Thanks in advance!