5.如图所示,在光滑水平面上有两个并排放置的木块A和B,已知mA=0.5 kg,mB=0.3 kg,有一质量为mC=0.1 kg的小物块C以20 m/s的水平速度滑上A表面,由于C和A、B间有摩擦,C滑到B表面上时最终与B以2.5 m/s的共同速度运动,求:
(1)木块A的最后速度; (2)C离开A时C的速度。
4.质量为M的小车静止在光滑的水平面上,质量为m的小球用细绳吊在小车上O点,将小球拉至水平位置A点静止开始释放(如图所示),求小球落至最低点时速度多大?(相对地的速度)
3.如图所示,质量分别为m和M的铁块a和b用细线相连,在恒定的力作用下在水平桌面上以速度v匀速运动.现剪断两铁块间的连线,同时保持拉力不变,当铁块a停下的瞬间铁块b的速度大小为_______.
2.小车AB静置于光滑的水平面上,A端固定一个轻质弹簧,B端粘有橡皮泥,AB车质量为M,长为L,质量为m的木块C放在小车上,用细绳连结于小车的A端并使弹簧压缩,开始时AB与C都处于静止状态,如图所示,当突然烧断细绳,弹簧被释放,使物体C离开弹簧向B端冲去,并跟B端橡皮泥粘在一起,以下说法中正确的是
A.如果AB车内表面光滑,整个系统任何时刻机械能都守恒
B.整个系统任何时刻动量都守恒
C.当木块对地运动速度为v时,小车对地运动速度为v
D.AB车向左运动最大位移小于L
1.质量相同的两个小球在光滑水平面上沿连心线同向运动,球1的动量为 7 kg·m/s,球2的动量为5 kg·m/s,当球1追上球2时发生碰撞,则碰撞后两球动量变化的可能值是
A.Δp1=-1 kg·m/s,Δp2=1 kg·m/s
B.Δp1=-1 kg·m/s,Δp2=4 kg·m/s
C.Δp1=-9 kg·m/s,Δp2=9 kg·m/s
D.Δp1=-12 kg·m/s,Δp2=10 kg·m/s
第三节 书面表达(满分30分)
假设你叫李明,“快乐男生”节目正热播,在学生中引起反响,上周你们学校为此展开了一场讨论。你的朋友Jack 关心此事,请你根据下表提供的信息,写一封回信,介绍此次讨论并发表你的观点。
|
观点 |
支持者 |
1. 给一些平凡却爱唱歌的男孩子提供了一个展示才华的舞台。 2. 增强了他们的竞争意识。 |
反对者 |
1. 花费了太多的时间和精力。 2. 因为不能集中精力学习,对他们未来自身发展不利。 |
你的观点 |
--- --- |
competition竞争,比赛
注意:1. 行文应连贯, 内容应完整; 2. 词数110字左右; 3. 写信的格式。
Dear Jack,
I’m writing to tell you the discussion that has been held in our school about Happy Boys’ voice,which was held by Hunan TV Stations.
第二节:短文改错(共10小题;每小题1.5分,满分15分)
如无错误,在该行右边横线上划一个勾(√);如有错误,则按下列情况改正:该行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。该行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。该行错一个词:在错的词下划一横线,在该行右边写出改正后的词。
Two years ago I went to America and study at a language 76.
school. I had many wonderful experience , but I also 77.
had a sad one. One day, the school held a party, in that 78.
I invited to talk about Handan. After that they asked me a lot of 79.
things about China. But I couldn’t explain to him in English 80.
clearly. I felt sadly. I learnt a lesson from this experience. I 81.
have already studied English for eight years, so I can’t use it 82.
very well. I must work hard to improve my speaking English 83.
so that I will not be able to communicate freely with foreigners. 84.
I hope I can be a bridge between China and other countries 85.
in the future.
第一节 单词拼写 (满分10分)
1. Water has three states: gas , liquid and (固体). 66.
2. The high-quality (飞行员)are badly needed. 67.
3. I’d like to buy two (打)eggs. 68.
4. The people’s (平均)income is increasing year by year. 69.
5. Women like (讨价还价) 70.
6. The village was surrounded by (敌人). 71.
7. The goods are paid by (支票). 72.
8. Tom shares everything with us (自愿地) 73.
9. Cellphones are (禁止) at school. 74.
10. As is known ,nobody is (完美的) 75.
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