PHYS250 Heat, Spring 01

Each HW problem worth 10 pts unless otherwise noted.
Answers posted at the bottom of this page.
Class Date Activities
1 Mon 15-Jan-01
Partial Derivatives, Sections 1.1 HW: 1.1
2 Wed 17-Jan-01
Sections 1.2-1.4 HW: 1.10, 1.12, 1.16a&b(20pts), 1.18
3 Mon 22-Jan-01
Sections 1.5 HW: 1.23, 1.28, 1.31, 1.37
4 Wed 24-Jan-01
Sections1.6-1.7 HW: 1.41, 1.50(20pts), 1.56
5 Mon 29-Jan-01
Sections 2.1-2.2 HW: 2.1, 2.2, 2.3, 2.5
6 Wed 31-Jan-01
Sections 2.3-2.4 HW: 2.8, 2.12, 2.13
7 Mon 5-Feb-01
Sections 2.4 HW: 2.23
8 Wed 7-Feb-01
Sections 2.5-2.6 HW: 2.27, 2.28, 2.31
9 Mon 12-Feb-01
Sections 3.1-3.2 HW: 3.1, 3.5(Use Ω=(eN/q)qwhen q<<N
10 Wed 14-Feb-01 Test 1
11 Mon 19-Feb-01
Sections 3.2-3.3 HW: 3.10, 3.13(for 3.13b estimate 1,000 moles of atoms are used in grass)
12 Wed 21-Feb-01
Sections 3.3-3.4 HW: 17, 19, 22, 32
13 Mon 26-Feb-01
Sections 4.1-4.2 HW: 4.3
14 Wed 28-Feb-01
Sections 4.3 HW: 4.9, 4.13
  5-9 Mar-01 Spring Break
15 Mon 12-Mar-01
Sections 4.3 HW: 4.20(20pts)-just derive eq. for eff, 4.26
16 Wed 14-Mar-01
Sections 4.4 HW:
17 Mon 19-Mar-01
Sections 5.1 HW:
18 Wed 21-Mar-01 Test 2
19 Mon 26-Mar-01
Sections 5.2 HW: 5.1, 5.5
20 Wed 28-Mar-01
Sections 5.3 HW:
21 Mon 2-Apr-01
Sections 5.4 HW:
22 Wed 4-Apr-01
Sections 5.5 HW:
23 Mon 9-Apr-01
Sections 5.6 HW:
24 Wed 11-Apr-01
Sections 6.1 HW:
25 Mon 16-Apr-01 Spring Holiday
26 Wed 18-Apr-01
Sections 6.2-6.3 HW:
27 Mon 23-Apr-01
Sections 6.3-6.4 HW:
28 Wed 25-Apr-01
Sections 6.4-6.5 HW:
29 Mon 30-Apr-01
Sections 6.6-6.7 HW:
  Friday
2-May-01
03:00-04:50		 Test 3

Answers to HW


3.1
for qA=1: TA=220K, TB=1060K
for qA=60: TA=660K, TB=660K

3.5-
3.10
(a) 36.6 J/K
(b) 11.0 J/K
(c) -44.1 J/K
(d) 3.5 J/K

3.13
(a) about 107 J/K
(b) about 104 J/K

3.17-
3.19-
3.22-
3.32
(a) 2J
(b) none
(c) 2J
(d) 1/300 J/K

4.3
(a) 1.5 GW
(b) 3.6oC
(c) about 600 kg/sec, 0.6 m3 or 0.6%

4.9 -
4.13 -
4.20 see notes
4.26 630 kg
4.30
(a) 49oC
(b) 2.68
(c) 50% liq, 41% gas

5.1 U= 3.74 kJ
S= 155 J/K
H=6.23 kJ
F= -42.6 kJ
G= -40.1 kJ
5.5
(a)ΔH= -890.36 kJ, ΔG=-817.90 kJ
(b) 818 kJ
(c) 72 kJ
(d) 1.06 V

5.20 transition temp is 8.5x104K
5.22 -
5.32
(a) -
(b) 135bar or 133 atm
(c)1,500 m
(d) 50 bar, ΔT=0.4 C

5.42(a)- (b) 28.2 C, 14.9 C
6.3
T=300K, Z=1+2.2x10-34
T=3,000K, Z=1.00043
T=30,000K, Z=1.46
T=300,00K, Z=1.93

6.4 total is around 3, prob of gnd state is around 1/3
6.6P(T=roomtemp, E2)=10-171, P(T=9500K, E2)=1.610-5
6.15
(a) 1.7 eV
(b) P(0eV)= 4/10, P(1eV)= 3/10, P(4eV)= 2/10, P(6eV)= 1/10
(c)1.7 eV