Hey guys, im understanding a bit more thermodynamics but ive been stumped once again on two problems: 1) A quantity of air is taken from state a to state b along a path that is a straight line in the pV-diagram If the volume and pressure in state a are 7.40×10−2 m^3 and 1.08×10^5Pa , and those in state b are 0.115 m^3 and 1.32×10^5 Pa , what is the work W done by the gas in this process? Assume that the gas may be treated as ideal. Is temperature constant here? I'm thinking so because of the line increasing at a constant rate. Do i need to apply [tex] W = \int p dV [/tex] with limits of [tex] V_2 [/tex] and [tex] V_1 [/tex] (don't know how to insert limits into the integral symbol on latex) Any ideas? 2) A thermodynamic system is taken from state a to state c in the figure along either path abc or path adc. Along path abc the work done by the system is 450 J. Along path adc, is 120 J. The internal energies of each of the four states shown in the figure are Ua=150 J, Ub=240 J, Uc=680 J, Ud=330J. A) Calculate the heat flow Q for the process ab. I dont know how to go about this - work i can deal with on the pV diagrams but Q i don't know. Any help please?