1. The problem statement, all variables and given/known data Q = ? ΔU = + 8.0x10^3 W = perhaps 0 since isovolumetric? Energy Lost = -2.0x10^3 Mass of Water = 2.0 kg 2. Relevant equations I'm stuck on this thermal dynamics problem. It states: "A 2.0 kg quantity of water is held at constant volume in a puressure cooker and is heated by a range elment. The system's interal energy increases by 8.0 x 10^3 J. However, the pressure cooker is not well insulated, and 2.0 x 10^3 J of energy is transferred to the surrounding air. How much energy is trasferred from te range elment to the pressure cooker as heat?" 3. The attempt at a solution I know that is is an isovolumetric problem, and in my book, that means work is equal to zero. Since 'w' is taken out of the equation, I solved it by Q = 8.0x10^3 J, from ΔU = Q - W. I then subtracted that by 2.0x10^3 J. My answer was completely off. What am I thinking wrong?