СҪƽĦ D.ʵͨͰıСܵ E. ʵӦ СȻٿʱĵԴ
4ijͬѧʵóݣ aF ͼͼʾô ͬѧʵгֵǣ A.ʵĦûƽ
B.ʵĦƽ C.СD.ʵС仯
Ͱ
⣨ 3 С⣬ÿС 34 ֡ӦдҪ˵ʽҪ㲽裮ֻ д𰸵IJ ÷ֵ֡⣬бȷдֵ͵λ 3 1510 ֣ͼʾһΪ 2.010kg ƽֱ·ʻ
3
Ϊ f = 2.510N ұֹΪ 80 kw
( l )˶ܴﵽ ٶȣ ( 2 )ٶΪ 5m/s
ʻ ʱļٶ a
216(12 )ϸ A C B CһΪ 10kg ˮƽļнͼʾ(g 10m/s). (1) A C B CܵС.
(2) A C B CֱΪ 100N 150NԷһ ȶϣʱΪ.
17(12 )ͼʾƽ AB Ϊ 37oб B AB 5m 1kg F
5N ˮƽ A Ӿֹʼ˶ B ʱȥ F彫ع⻬б B ʲ䣩֪2ˮƽĻĦΪ 0.25ȡ g=10m/s,
sin37=0.6 cos37=0.8
1˶ B ٶ
2б˶ʱ䡣
һѧĩ
һѡѡ( 12 С⣬ÿС 4 ֣ 48 ֡ÿСĸѡУ 1~8 ֻһ
ĿҪ 9~12 жĿҪȫѡԵĵ 4 ֣ѡԵȫ 2 ֣ѡĵ 0 ֡) 1D 2C
ʵ⣨ 2 С⣬ÿո 2 ֣ 18 ֡
13 (1)жȡ FFF1 2 ʱӦ 1F2 ķ(2)ڡСӡ(3)Сʹ ġͬΪƤ3C 4 D
5B 6B 7D 8B 9BD 10BD 11BD 12BD
ϸߵĽ O㡱
2
14 (1)0.85m/s5m/s (2) BA
(3) AD (4) B
⣨ 3 С⣬ÿС 34 ֡ӦдҪ˵ʽҪ㲽裮ֻ д𰸵IJܵ÷ֵ֡⣬бȷдֵ λ һѧĩģ
һѡ⣨ 12 С⣬ÿС 4 ֣ 48 ֡ÿСĸѡУ 1
8 ֻһĿҪ 912 жĿҪȫѡԵĵ 4 ֣ѡԵ
ȫĵ 2 ֣ѡĵ 0 ֣ 1鵥λУһеĸλǹʵλеĻλ( AmNs Bmkgs CkgJs )
DmkgN
2ͼʾ̶бһ⻬Сһֱᵯ P һƽбᵯ Q ţСھֹ״̬С˵ȷǣ A. Сб֮һе B. ᵯ P һ
е
C. ᵯ Q ܴѹ״̬ D. ֻܵ 4
3ڹԣ˵ȷǣ Aֹûйԣ˶й BĹԣСй CʻʻIJͣٶȴ D崦ȫʧ״̬Ĺʧ 4.˵ȷǣ
A. ϳˮƽ·ֱ˶ϳϳ B. УΪѹ֧ C. ֱסһƿʹ֮־ֹ״̬յԽƿܵĦԽ D. ˶Աʱ֧Եѹ 5.й˶ȷǣ Aֱ˶У˶·λƵĴСһ BļٶС˶ٶһС CٶΪ㣬ٶһΪ DٶȼСԽٶһԽС
6. ͼʾ֦ˮƽļнΪΪ G ţ֦ У֦ţСΪ A. G
B.С G
C. Gsin
D. Gcos
7.ڿ˶壬ܵĿһٶȵڸ߿ɡ ˵ȷǣ
Aɡڼ½̣кԳصĸо Bɡ̣ڳʧ CɡǰٶȵҲٶȼСʧ