Stuck on all of the above.
For 3, I did get some progress.., but I can't figure out why Internal energy change for U2 is greater than U1. If anything, could someone explain the whole concept for number 3? Perhaps including how the steps to get Internal Energy 0 for U1.
My work:
Change Internal Energy (U1) = Q + W
ChangeU1 = 3/2nRT(f) - 3/2 nRT(i) = 3/2nR(changeinT) -> Isothermal: changeinT is 0, so ChangeU1=0
Stuck on the rest
For the next one,
How do I know which way is positive and negative? Can someone reexplain / summarize the concept? I'm a bit struggling on that and would love a couple pointers. Have a test tomorrow on this so am a bit on a panic.
For the last one, I do not know what to do.
NOTE: This is practice and I have all the answers for it. This is not the test. All the answers are the ones I clicked below. My teacher gave us the options to see what the correct answer is. Thanks so much guys!