1. The problem statement, all variables and given/known data Info on object: Mass = 10kg Radius = 0.20m Lenght of spouts = 0.10m above surface of sphere. (The two spouts can be considered massless.) The sphere is hollow and looks like this. The pressure inside is 1.5 atm and the pressure outside is 1.0atm. http://upload.wikimedia.org/wikipedia/commons/3/3e/Aeolipile_illustration.JPG [Broken] a) Find moment of inertia (found) b) What is the angular acceleration of the container? Take the area of the spouts to be circles of radius 0.010m. 2. Relevant equations Not sure, but I used Pascals principle. Bernoullis came to mind, but I doubt it. 3. The attempt at a solution a) I = 2/3*MR^2 = 0.26... I = 0.27 b) Pout = Pin(not sure since this is not true since pressure inside is 1.5atm pressure outside is 1.0atm) Fout/Aout = Fin/Ain Fout/(pi*r^2) = 1.5atm/(pi*r^2) Fout=1.5atm 1.5atm = 151950 N/m^s This is a tangental force..... F=mra (a is alpha, angular acceleration; r+lenght of spouts) a=F/(mr) a=50650??? Does not look right I am a bit confused on what to use for part b of this question. I do not think that my result is accurate. Any advice would be appreciated or any pointers. Thanks edit: Also anyone know how to find the energy stored by the steam inside the container??