Thermo-cycling in the Snow!

Handout answers:

1
a) T = 481 K
b) Wnet = +4000 J
c) For a full cycle, delta_U = 0. This means that for the entire cycle, Q = -W = -4000 J.
d) For any cycle, delta_U is zero, so it stays the same.

2.
a) AB,CD - isobaric, BC, DA - isochoric
b) 1.202 x 10^-4 moles (use P,V, and T at state D.)
c) Wab = -1.0 J, Wad = 0.5 J, all others zero
d) net work for cycle is the area inside = -0.5 J
e) Tb = 800 K, so delta_U = 0.750 J
f) P = Wnet/delta_t = 0.5 J/1.2 s = .417 W

3. b, c, a (remember that in c and a, the work is negative, and C has a work that is LESS negative.)