...thermodynamical cycle? Consider a thermodynamic cycle, where 1: the pressure increases from P to 2P isovolumetrically. Then 2: the gas expands on the diagonal line. Then 3: the gas compresses from 2V to V isobarically. Consider the temperature at the point (P,V) to be T. There are n molecules of gas. What is the change in internal energy in step 2?
A) nCvT
B) -nCvT
C) nCpT
D) -nCpT
E) 0

My answer:

I think the answer is 0 since the formula for the energy in this step should be U = Q+W = 0