1、 1 2017 1 2 100 90 2 24 1 A 160dm B 50g C 10 4 Pa D 60 2 A B C D 3 A B C D 4 A B C D 5 S t 6 2 7 2016 20 A B 20 C D 8 9 10 3V S 3V A L1 B L1 C L2 D L2 11 R2 P A A V V 10 L 1L 2S 11 V 2 V 1 A R 1 R 2 P 3 B V2 A C A V D V1 V2 12 A B C D 3 9 1 13 LED LED 24V 8W PZ220-60 A B C 24V D 1 12h 14 3.2N 2m 10s
2、 80% A 6.4J B 8J C 0.4m/s D 5 m 15 L1 3V 3W L2 6V 3W 2 A L2 A 9V B L2 0.6A C L1 3 D L1 L2 2:1 14 15 1 R P 2 L 1 L 2 A B S 4 2 24 16 2016 10 17 30 17 18 19 20 21 A B I U A V A B 22 20 21 V/cm 3 m/g A B 23 27 5 23 A B m V A B 24 2.9 10 7 J/kg 100g J 25 26 27 2016 7 31 28 6 29 6 30 8 20 28 1 2 3 4 20cm
3、 5 cm 29 1 28 6 2 N l cm N l cm 1 10 2 5 2 10 1 20 2 15 3 10 3 4 5 30 6V 0 0.6A 0 3A 0 3V 0 15V 5 10 15 1 1.5A 20 1 ( ) 2 29 l 1l 27 3 5 2V A 5 10 2V _ 4 15 2V 5 6 4 8 31 0.2 0 A 0 1 2 3 0.4 0.6 0.6 3 V A 34 8 32 33 6 34 9 15 33 220V 2000W 1 4.2h 2 , 4.2h 20 100 ? C =4.2 10 3 / kg 34 2014 3 8 MH370
4、5000t 1.0 10 3 kg/m 3 g=10N/kg 1 2 2000m 3 18km/h 5h 1.2 10 6 5 h 32 9 2017 2 24 1 2 3 4 5 6 7 8 9 10 11 12 C A C D A B A B B D C D 3 9 13 14 15 A C A B C D 2 24 16 17. 18 19. 20 81.4 -12 21. 0.3 10 22 23. 24 2.9 10 625. 26 27. 28 6 29 6 30 8 20 28 ( 1 ) (1) (2) (3) (4) (5)10 29 ( 1 ) 1 2 3 = F1 l =
5、F2 l2 4 5 2 30 ( 1 1 ) 1 2 3 3 0.4 10 4 5 6 4 8 31 1 1 1 1 32 ( 1 ) - 2 2 - 33 8 34 7 15 33 :(1) W=Pt 1 =2KW 4.2h 1 =8.4KWh=3.024 10 7 J 1 (2) W =Q =cm t 1 3.024 10 7 J =4.2 10 3 J/(kg. ) m (100 -20 ) 1 m=90kg 1 34 :(1) F =G =m g 1 =5 10 6 kg 10N/kg 1 =5 10 7 N 1 (2) P = gh 1 =1.0 10 3 kg/m 3 10N/kg 2000m 1 =2 10 7 Pa 1 (3) S=vt=18km/h 5h=90km=9 10 4 m 1 w=Fs 1 =1.2 106N 9 10 4 m=1.08 10 11 J
