祝愿天下所有考生开心度过高考。祝福你们旗开得胜，取得美好佳绩。平心对待高考，你们是最棒的！仁慈的上帝会祝福你们的，相信自己，一定能行！
![](https://wkrtcs.bdimg.com/rtcs/image?w=164&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"164","h":"60","dataType":"png","c":"word/media/image1.png","imgOriW":164,"imgOriH":60})
www.ks5u.com
![](https://wkrtcs.bdimg.com/rtcs/image?w=33.333333333333&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"33.333333333333","h":"26.666666666667","dataType":"png","c":"word/media/image2.png","imgOriW":25,"imgOriH":20})
2018-2019学年
![](https://wkrtcs.bdimg.com/rtcs/image?w=549&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"549","h":"753","dataType":"png","c":"word/media/image3.png","imgOriW":566,"imgOriH":776})
最新试卷十年寒窗苦，踏上高考路，心态放平和，信心要十足，面对考试卷，下笔如有神，短信送祝福，愿你能高中，马到功自成，金榜定题名。
![](https://wkrtcs.bdimg.com/rtcs/image?w=552&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"552","h":"804","dataType":"png","c":"word/media/image4.png","imgOriW":558,"imgOriH":812})
![](https://wkrtcs.bdimg.com/rtcs/image?w=548&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"548","h":"219","dataType":"png","c":"word/media/image5.png","imgOriW":571,"imgOriH":228})
![](https://wkrtcs.bdimg.com/rtcs/image?w=552&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"552","h":"167","dataType":"png","c":"word/media/image6.png","imgOriW":563,"imgOriH":170})
![](https://wkrtcs.bdimg.com/rtcs/image?w=552&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"552","h":"386","dataType":"png","c":"word/media/image7.png","imgOriW":613,"imgOriH":429})
14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
B | B | C | C | BD | CD | AC | BD |
![](https://wkrtcs.bdimg.com/rtcs/image?w=153.4&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"153.4","h":"140","dataType":"png","c":"word/media/image8.png","imgOriW":261,"imgOriH":238})
22.(每空2分) (1)大于 (2) CD (3) m1·OA+m2·OC
23. （1）甲 （2分）
（2）B、C（每个1分，共2分）
（3）如图所示（1分）
（4）1.5 0.83（每个1分，共2分）（5）C （2分）
24. (14分)
(1)滑块做匀减速直线运动,加速度大小：
a=fm=2 m/s2（2分）
v2A−v20=−2ax （2分）
解得：vA=6m/s（1分）
答：A与B碰撞前瞬间的速度大小为6m/s.
(2)碰撞过程中满足动量守恒：mvA=2mv（2分）
解得：v=3m/s（1分）
答：碰后瞬间，A与B共同的速度大小为3m/s.
(3)由b运动到c的过程中，根据动能定理
设c点的速度为vc，
![](https://wkrtcs.bdimg.com/rtcs/image?w=136&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"136","h":"29","dataType":"png","c":"word/media/image9.png","imgOriW":191,"imgOriH":41})
（2分）
解得：vc =![](https://wkrtcs.bdimg.com/rtcs/image?w=10&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"10","h":"12","dataType":"png","c":"word/media/image10.png","imgOriW":15,"imgOriH":18})
m/s（1分）
根据受力分析：![](https://wkrtcs.bdimg.com/rtcs/image?w=76&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"76","h":"29","dataType":"png","c":"word/media/image11.png","imgOriW":115,"imgOriH":44})
（2分）解得：N=8N（1分）
答：轨道对A与B的作用力N的大小为8N.
![](https://wkrtcs.bdimg.com/rtcs/image?w=152&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"152","h":"135","dataType":"png","c":"word/media/image12.png","imgOriW":152,"imgOriH":135})
25. （18分）（1）由粒子在电场中运动的情况可知，粒子带负电，设粒子在电场中运动所用的时间为，x方向： （1分）
y方向：![](https://wkrtcs.bdimg.com/rtcs/image?w=79&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"79","h":"28","dataType":"png","c":"word/media/image15.png","imgOriW":79,"imgOriH":28})
（1分）
得：![](https://wkrtcs.bdimg.com/rtcs/image?w=57&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"57","h":"33","dataType":"png","c":"word/media/image16.png","imgOriW":57,"imgOriH":33})
（1分）
（2）设粒子到达N点的速度为![](https://wkrtcs.bdimg.com/rtcs/image?w=7&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"7","h":"18","dataType":"png","c":"word/media/image17.png","imgOriW":7,"imgOriH":18})
，运动方向与x轴负方向的夹角为，如图所示。
由动能定理得：![](https://wkrtcs.bdimg.com/rtcs/image?w=107&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"107","h":"23","dataType":"png","c":"word/media/image19.png","imgOriW":131,"imgOriH":28})
. （2分）
将代入得： （1分）
因为![](https://wkrtcs.bdimg.com/rtcs/image?w=61&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"61","h":"25","dataType":"png","c":"word/media/image21.png","imgOriW":61,"imgOriH":25})
（1分）所以 . （1分）.
得![](https://wkrtcs.bdimg.com/rtcs/image?w=56&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"56","h":"18","dataType":"png","c":"word/media/image20.png","imgOriW":56,"imgOriH":18})
（1分）
粒子在磁场中做匀速圆周运动，经过P点时速度方向也与x负方向成![](https://wkrtcs.bdimg.com/rtcs/image?w=20&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"20","h":"18","dataType":"png","c":"word/media/image23.png","imgOriW":20,"imgOriH":18})
，从P到M做匀速直线运动，所以
粒子在磁场中的轨道半径![](https://wkrtcs.bdimg.com/rtcs/image?w=112&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"112","h":"23","dataType":"png","c":"word/media/image26.png","imgOriW":151,"imgOriH":31})
（1分）
洛伦兹力充当向心力，根据牛顿第二定律有![](https://wkrtcs.bdimg.com/rtcs/image?w=71&md5sum=0e4085f8c06828ac36a3369383ea5e6a&sign=e7522e62e1&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=117&ipr={"t":"img","w":"71","h":"30","dataType":"png","c":"word/media/image27.png","imgOriW":71,"imgOriH":30})
（1分）
本文来源：https://www.2haoxitong.net/k/doc/69c7cc70a31614791711cc7931b765ce04087a0a.html
文档为doc格式