1. The problem statement, all variables and given/known data A cylindrical figures contains a gas and we have a piston that is capable of changing the gases volume. Initial state: V0=1l P0=10^5p T=300°K We pressurize on the piston that has a mass m=300g and a surface S=20cm^2. The new temperature T1=540°K 2. Relevant equations Calculate the change in internal energy. 3. The attempt at a solution Well I know that the change in internal energy is: ΔU=W+Q or ΔU=-P1(V1-V0) and that p=F/S. but since my teacher didn't explain the lesson well enough I have no clue on how to answer it. Any help would be very well appreciated.