A cylinder with movable piston contains 4.0 L of gas at 30C and 5.0 bar pressure. The piston is slowly moved to compress the gas to 8.0 bar. Considering the system to be the gas in cylinder, the simplified energy balance takes the form? (Do not assume the system is isothermal)

Group of answer choices

U=Q-W

U+Ek+Ep=Q-W

U+Ek+Ep=Q+W

U+Ek+Ep=Q