Chapter 19 – College Physics, 7th Edition (Sears, Zemansky, Young)

 

19-1.        a) 33.3% b) 6000 J c) 0.18 g                 d) 1.5 x 105 W; 201 hp

19-2.        a) 80 kW                b) 60 kW

19-3.        a) 40%                    b) 300 MW

19-4.        a) 2000J                  b) 28.6%

19-5.        a) 1.4 x 104 J           b) 57.1%

19-6.            9.88

19-7.            331°C

19-8.            a) 333 W                b) 2.5

19-9.            a) 7.5 x 103 J           b) 2.25 x 104 J

19-10.         a) 3.5 x 105 J           b) 1.17 x 105 J         c) 4.67 x 105 J

19-11.          ?

19-12.         ?

19-13.         a) 258K                   b) 35.6% c) 185J

19-14.         a) 1.1 x 107 J           b) 9.88 x 105J

19-15.         a) 3750 J b) 1250J                  c) 25%

19-16.         a) 560 J                   b) 480 W                c) 2.5

19-17.         a) 488 J/K               b) –454 J/K            c) 34 J/K

19-18.         8.33 J/K

19-19.         –3.02 x 103 J/K

19-20.         a) 20.8 km2 ; 8.04 mi2             b) 41.7 km2 ; 16.1 mi2

19-21.         5.7%

19-22.         a) 1500 MW          b) 60 kg/s; 5.18 x 106 kg·day              c) 9 x 108 J/s           d) 43 m3

e) 0.0859 m/s

19-23.      see back of book

19-24.  a) p1= 3.04 x 105 Pa, V1 = 2 x 10-3 m3

    p2 = 3.04 x 105 Pa, V2 = 3.33 x 10 –3 m3

    p3 = 1.52 x 105 Pa, V3 = 3.33 x 10 –3 m3

    p4 = 1.52 x 105 Pa, V4 = 2 x 10-3 m3

b)  process 1 to 2; Q = 1433 J, W = 405 J

                     process 2 to 3; Q = -1285 J, W = 0

                     process 3 to 4; Q = -716J, W = -202 J

                     process 4 to 1; Q = 771 J, W = 0

                c) 203 J

                d) 9.19%

19-25.      10.6%

19-26.      a) 80 K    b) 40 K

19-27.      a) –178 J/K            b) 244 J/K              c) 0          d) 66 J/K

19-28.         e= 1 – Tc/TH, same as for original engine

19-29.         63.9%

19-30.         c) 1 – Tc/TH