1、 2017 100 I00 12 2 24 1 A B C D 2 A B C D 3 A B C D 4 A. 1.5m/s B. 50W C. 1.5V D. 100 m 8 s 5 a b A B C D 6 A B C D 7 A B C D 8. A B O S t O A B 3s A O B O 5m 3s vA vB 5s A B A B A B C D 9 A B C D 10 220V 40W L0 S S1 L0 L1 S S2 L0 L2 A 1 B L2 C 1 D L2 11 4.5V L A 0.18 0.5A B 2.5 C 0.162W D 2.25W 12
2、S A V A h A A F= ghS B A A=0.5 C A A F=0.5 gV D A GB B A A FN=0.5 gV GB 9 1 28 13 14 A B A B A B 15 80 16 10g J 4.6 10 7 J/kg 180km h 17. 18. S P 19. 1/4 kg/m 3 120Pa Pa 20. W W W W 21 R0 P0 R PR PU I a b c PU I a b c R0 R W 7 48 22 1 2 A 2 2 N 3 2 23 6 1 2 3 N m 3 g 10 N/kg 4 N kg/m 3 24 6 U r U r
3、R1 R2 S S1 1.40 V S S2 1.35 V U= r = R R U 25 8 1 0 2V V 2 I1 U S1 R2 S2 R2 I1 R2 I2 P U I1 I2 26 6 500N 1200N 1.5m 30s 1 2 3 27 8 R1 R2 S 220V 1 S1 R2 2 30min J? ? 3 0 15min 1.1kg 20 100 c 3 J/ kg 28 8 U1=6V R1 R2 U2=220V R0 R1 R0 R1 0.05A 0.05A 1 . 2 50 3 50 100 S R2 R1 220V 0 1 2 3 5 105 15 20 25
4、 30 t/min I/A 12 2 24 1 2 3 4 5 6 7 8 9 10 11 12 C B C A B C D D C B D D 9 1 28 13 320.6 14 15 20 16 4.6 5 2 17 18 19 750 160 20 21 a 1 2.25 7 48 22 2 6 2 1 2 2 23 1 6 1 2 3 4 4 -4 4 4.4 1.1 3 24 1.5V 1 0.5 1 2 2 25 1 8 1 2 2 I1 R1 26 1 1800 J 2 2 75W 2 3 80% 2 27 1 1 73.3 2 2 9.9 5 J 2 0.3 1 3 70% 2 28 1 1 1 2 40 2 100 2 3 50 1 50 R1 1
