S.) A system has constant volume (AV=0) and the heat around the system increases by 45 J. a.) What is the sign for heat (q) for the system? b.) What is AU equal to? c.) What is the value of internal energy of the system in Joules? 6.) A container has a sample of nitrogen gas and a tightly fitting movable piston that does not allow any of the gas to escape. During a thermodynamics process, 200 joules of heat enter the gas, and the gas does 300 joules of work in the process. What was the change in internal energy of the gas during the process described? 7.) A non-flow system receives 100 k] of heat transfer and also 40 k] of work is transferred to it. What is the change in the internal energy of the fluid? 8.) A steady flow system receives 500 kW of heat and loses 200 kw of work. What is the net change in the energy of the fluid flowing through it