1、 2016 3 8 24 1 A 300g B 10m/s C 5A D 5000N 2 A B C D 3 A B C D “ ” 4 A B C D 5 A B C D 6 2015 2 11 400N 0.2m 1s F 150N A 0.2m/s B 30 W C 88.9% D 200N 7 A B C D 8 R 1 R 2 S P V 2 A A R 1 5 B P b a V 1 C P b a A V 2 A D P V 2 U 2 A I 1 12 9 1644 100 10 “ ” “ ” “ ” “ ” 11 1820 a “ N ” “S” “ N ” “ S” 12
2、 S B =200cm 2 S A =120cm 2 H=20cm A A h=10cm Pa A N 13 2014 12 17 1 4 “ ” 14 F L 15 S E S E S 15 6 16 8 17 8 22 16 1 50cm 25cm 15cm cm 2 3 50cm 15cm “ ” “ ” “ ” “ ” “ ” 4 3 “ ” “ ” 17 1 2 “ ” “ ” g 30g cm 3 g/cm 3 3 h 0 h 1 h 2 = 18 “3.8 V ” 1W 1 1 1 2 3 1 A W 4 “ ” “ ” /V 1.5 2.0 2.5 3.0 3.8 4.0 /A
3、 0.2 0.22 0.25 0.28 0.34 /W 0.3 0.44 0.625 0.84 1.36 5 P U 2 P I 2 2 6 18 6 19 8 20 8 22 19 4 10 3 kg 0.4m 2 0.5 2min 1200m g=10N/kg 1 2 2min 20 R 1 R 2 220V 5A 2A 50Hz 1 2 3 80% 10 20 70 21 1 1 3 2m 2 h 2 1 2 3 2016 3 8 24 1 A 300g B 10m/s C 5A D 5000N A 300g 300g A B 4km/h=4 m/s 1.1m/s B C 0.2A 0.1A C D 50kg G=mg=50kg 10N/kg=500N D A 2 A B C D A A B B C C D D B 3 A B C D “ ” 1 2 3 4 A A B B C C D “ ” D C 4 A B C D A B C D D 5 A B C D 1 2 3 4 A A B
