Hi, I'm really struggling with a thermodynamics coursework question, I'm not looking for the answer straight up, just wondering how to go about solving the problem as it's been racking my brain for a stupid amount of time. Here's the problem I've been given: Shaft work (500kJ/kg) is transferred to an air-filled frictionless piston-cylinder device. Determine the net heat transfer (kJ/kg) if the initial state of the air is T1=200C, P1=400kPa and the final state of the air is T2=250C. See the attachment for a diagram of the cylinder in question. I'm not sure whether to assume if the process is isochoric and if so, the internal energy's equal to the heat transferred, but to work that out I need to know the specific heat capacity of the air. It's got me stumped! Any help is greatly appreciated!