Chapter 13
24. (a) 2.69 x 10^{25} molecules/m³
    (b) 3.34 nm  (assuming each molecule occupies
        its own cube) or 3.75 nm (assuming each
        molecule occupies its own sphere - a much
        harder calculation)
    (c) 28.0 g and 1.25 kg/m³
38. 2.09 mm
54. 3410 J
60. 1.62 atm
72. (a) 27.4°C
    (b) 4460 N (using Y for iron as given 
                in problem 71)
Chapter 14
 8. 11.4 kg
26. 79.7 s
28. 57.6 K (so ventilation is important)
40. 329 m/s
50. (a) 5.23°C
    (b) 14.8°C
    (c) doesn't matter, the total resistance
        is R1 + R2 either way.
72. 10.0 mK
74. 6.32 kg
Chapter 15
10. (a) 436 J if you use (5/2)R for Cv;
        439 J if you use Cv for O2 from 
              the table on page 482
    (b) 1230 cm³
    (c) 125 J
    (d) 312 J
16. 1770 J
18. $2.40
42. 102 mW/K
45. (a) 96.9 W
    (b) 331 mW/K
56. 15.0 kJ
62. (a) 6.20 mJ
    (b) 21.7 mJ
    (c) only 1.24 mK (thus the fish can be
        considered as a heat reservoir for
        the air bladder)
64. 3.81 kJ
70. 87.1 kJ
72. (a)   Wby(J)  deltaU(J)   Q(J)
      A   +692       0       +692
      B     0      -2080     -2080
      C   -506       0       -506
      D     0      +2080     +2080
    ABCD  +185       0       +185
    (b) 6.70%
    (c) 26.8%, which is 4 times as large