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Answers to Chapter 11 Problems

 

11.3.1   63.1 m s–1   

11.3.2  0.34 °C

11.4.1  28 °C;    910 J kg–1 K–1

11.5.1  5670 W;    86 W 

11.5.2  (a) 0.06 W   

            (b) the rate of heat flow would then be  4.67 W m2 which is much greater than the rate calculated in (a)

11.5.3  109 J s–1

11.7.1   253 K;   0.05 mW

11.7.2   0.32 K s–1

11.8.1    \( {{\Delta \tau} \over \tau} \)  =  \( {1 \over 2} {\alpha_L \Delta T } \);    29 s

11.8.2    16.5 °C

11.9.1  CP&²Ô²ú²õ±è;–&²Ô²ú²õ±è;CV = 0.2 J K–1

11.10.1  (a)   The density of water is greatest at 4 °C. Water at this temperature sinks to the bottom and stays there even when the water above cools below 4 °C.    (b)  7.8 cm    (c)  7.4 days

11.10.2  (a)  62.7 J s–1      (b)  53.0 °C      (c)  47.3 J s–1 m–1 K–1

11.10.3  21.7 g

11.10.4  (a) 81.1 g    (b)  14.7 °C;     In (a) more ice will have to melt to balance the additional heat energy.  In (b) the temperature rise will be greater.

11.10.5   40 mg s–1

11.10.6  3.8 μm s–1

11.11.1  1.3 mm

11.12.1  (a) 600 K     (b)  6.0 × 105 N m–2      (c) 1800 J  

11.12.2  (a) 68 °C     (b) 2.5 × 10–3 m3     (c) 6.9 J

11.14.1   0.15 J kg–1 K–1

11.14.2  (a) 300 K   (b) 42 K    (c)  32.5 J K–1 mol–1

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