1. The problem statement, all variables and given/known data A solid cylinder of mass M =1kg and radius 0.5m is pivoted at its centre and has three particles of mass m=0.1 mounted at its perimeter on the curved surface.The system is initially at rest.Find the angular speed of the cylinder,when it is swung through 900 in anticlockwise direction. http://img24.imageshack.us/img24/3603/4ufn.png [Broken] 2. Relevant equations 3. The attempt at a solution According to me it is impossible to find the angular velocity as the time taken to spin it in 900 is not given.So i think that the the question doesn't give complete information.Am i right??