SOAL NME

5.22)Diket : h = 7 mA = 23 km2 = 1000 kg/m3L = 21 kmt = 370 minDit : Ep rata-rata?Jawab : = = m = .A.h = (1000 kg/m3) (23 km2) (7 m) (103 m/km)2 = 1,61 x 1011 kgEp = m.g.h = (1,61 x 1011 kg) (9,8 m/s2) (7 m) = 1,10 x 1013 JEp rata-rata = (1,10 x 1013 J) (2) (0,85) () () = 5,06 x 108 J/s = 5,06 x 108 W

5.23)Diket : Dilihat menggunakan steam tablesKeadaan pertama : T = 250,5oCP = 4000 kPaH = 2801 kJ/kgV = 0,05 m3/kgKeadaan kedua : T = 650oCP = 10.000 kPaH = 3748,3 kJ/kgV = 0,0410 m3/kgDit : U ?Jwb : U = H - pV = (3748,3 2801) [ (10.000 x 0,041) (4000 x 0,05)] = 737,3 kJ/kg