因此，对A 、B 整体，由牛顿第二定律，有422k k
q q ma l l
?
+?=
即 2mg =2ma 得a=g
对A ： k
q T ma l ?
+= 解得 mg T 3
1=
Mg
F N ＇
N f
θ θ
故撤去外力瞬时，A 、B 的加速度a=g ；A 、B 小球间绝缘细线的拉力mg T 3
1=
（3）（6分）当A 向左运动达到速度最大时 2k
q mg r
?
= 代入k ，得
l r 3
1=
设从剪断绝缘细线到A 球向左运动达到最大速度，电场力做功为W ，由动能定理
21
2()02
m mg l r W mv -+=
- 解得 241
(
)32
m mgl W mv =--，负号表示电场力做负功。 又由电场力做功可知W=qU 因此 2
4()32m W mgl mv U q q q
==--
在A 球向左运动达到最大速度的过程中，所在处电势升高了。 变化量为 2
432m mgl mv U q q
?=-
33．（14分）
解：（1）（3分）由图知
0.2
0.1T/s 2
B t ?==? 0.10.51V 0.05V BLd
E t t
???=
=
??=??= 0.05A 0.25A 0.2
E I R === 根据楞次定律，电流方向为abPMa 。
（2）（2分）ab 棒在水平方向受安培力和摩擦力，二力平衡
f =BIL =（B 0-kt ）IL =(0.2-0.1t )×0.25×0.5N=0.0125(2-t )N （t <3s ）
（3）（5分）ab 棒做匀变速运动，位移s 1=3.5m 时，速度大小设为v 1，则
22
102v v as -= 代入数据，得 a =-4m/s 2 解得
v 1=6 m/s
对应安培力大小 2222
10.10.56N 0.075N 0.2
A B L v F B I L
R ??==== 向右运动时，F +μmg +F A =ma F +0.1+0.075=0.1×4 F =0.225N ；方向向左 向左运动时，F -μmg -F A =ma
F -0.1-0.075=0.1×4
F =0.575N ；方向向左
（4）（4分）前3s 内通过电阻R 的电量q 1=I ×Δt =0.25×3 C =0.75C
设3s 后到撤去外力F 时又运动了s 则
21BLs
q I t t q q t R R R
????=??=
??===-??=1.5C 解得 s =6m
此时ab 棒的速度设为v 2则 22
202v v as -= 解得 v 2=4 m/s
此后到停止，由动能定理 W A +W f =ΔE k W A =－Q
2221(0)(0.6050.8)J 0.195J 2
f k Q W E mgs mv μ=-?=---=-+=
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闵行区2010学年第二学期九年级质量调研考试 （满分150分，考试时间100分钟） Part 1 Listening（第一部分听力） I. Listen and choose the right picture (根据你听到的内容，选出相应的图片)：（共6分） 1._________ 2._________ 3. _________ 4. _________ 5. _________ 6. _________ II. Listen to the dialogue and choose the best answer to the question you hear (根据你听到的对话和问题，选出最恰当的答案)：（共10分） 7. A) Washing the dishes.. B) Watching TV. C) Doing some cooking. D) Reading a newspaper. 8. A) Rainy. B) Sunny. C) Windy. D) Cloudy. 9. A) Boring. B) Wonderful. C) Exciting. D) Awful. 10. A) She has a headache. B) She has a stomachache. C) She is not hungry. D) She has much work to do. 11. A) Ten days. B) Eighteen days. C) Twenty-eight days. D) Thirty days. 12. A) Jump out of a window. B) Go downstairs. C) Stay beside a bed. D) Stay under a bed. 13. A) The red one. B) The black one C) The white one. D) The green one. 14. A) On the beach. B) At the entrance of their estate. C) On the phone. D) In the park. 15. A) School news. B) School hobby groups. C) An educational visit. D) School newspapers. 16. A) The test had only two pages. B) The girl finished the test in an hour.
2018年上海市闵行区初三英语二模试卷及答案(Word版)
闵行区 2017 学年度第二学期初三年级学业质量调研 英语学科试卷2018 年4 月 (满分150 分，考试时间：100 分钟) 考生注意：本卷有7 大题，共94 小题。试题均采用连续编号，所有答案务必按照规定在答 纸上完成，做在试卷上不给分） Part 1 Listening(第一部分听力） Part 2 Phonetics , Grammar and Vocabulary (第二部分语音、语法和词汇) II.Choose the best answer(选择最恰当的答案)：（共20 分） 26. Which of the following underlined parts is different in pronunciation from the others? A.I need double milk for my coffee. B.We are proud to be Chinese. C.The women shouted loudly for help D.They are going to buy a new house. 答案：A; A 发音[?] ，BCD 发音[a?] 27. Take a look at booklet on the shelf.It tells you how to use the new cooker. A.a B.an C.the D./ 答案：C；特指加定冠词the. 28. Linda came back home half past ten last night.That's really too late. A.at B.on C.in D.for 答案:A; 具体时刻前用at 29.It's important for to know that honesty is the best solution when in trouble. A.we https://www.wendangku.net/doc/7f4906601.html, C.our D.ours 答案：B; 介词后做宾语用宾格 30. The government says that they are going to build the third road in the town. A.wide B.wider C.widest D.the widest 答案：C; 有序数词修饰的最高级前省略the 31. The audience was surprised the result of the singing contest. A.from B.with C.at D.about 答案：C; be surprised at sth. 对某事感到惊讶 32. Though it was very dangerous, hesitated when entering the burning lab. A.everybody B.nobody C.anybody D.somebody 答案：B; 出现though, 让步状从，尽管很危险，没有人犹豫 33. He's put on so much weight that his clothes aren't any more. A.wonderfully B.beautifully C.expensive D.fit 答案：D；put on so much weight 表示增重很多，所以对应衣服不再适合。 34.Alice would rather in an air-conditioned room in such hot weather. A.stay B.to stay C.stays D.staying 答案：A，would rather do 35.Tracey suggested basketball in Sports Club after school.
2016年上海市闵行区中考英语二模试卷及解析
2016年上海市闵行区中考英语二模试卷 一、I Listening Comprehension（听力理解）（共30分）A．Listen and choose the right picture（根据你听到的内容，选出相应的图片）（6分） 1．（6分） 123456． 一、B．Listen to the dialogue and choose the best answer to the question you hear （根据你听到的对话和问题，选出最恰当的答案）（8分） 7．（1分）A．A watch B．A book C．A case D．A stamp． 8．（1分）A．By car． B．By train． C．By plane D．By bus． 9．（1分）A）Sunny． B）Rainy． C）Windy． D）Snowy． 10．（1分）A．She doesn't like parties
B．Her doctor will visit her． C．She is busy working． D．She is not feeling well． 11．（1分）A．At an airport． B．At a supermarket． C．At a hotel D．At a bank． 12．（1分）A．At 7：00． B．At 8：00． C．At 9：00． D．At 10：00． 13．（1分）A．Manager and secretary． B．Shop assistant and customer． C．Teacher and student． D．Wife and husband． 14．（1分）A．They can buy vegetables together． B．They can go out for dinner that day． C．He has never eaten in that restaurant． D．He disliked the food the woman cooked． 一、 C. Listen to the passage and tell whether the following statements are true or false （（判断下列是否符合你听到的内容，符合的用“T“表示，不符合的用“F“表示. （6分. 15．（6分）15．An old couple went to their doctor because they were seriously ill．16．The doctor told them to write things down in order not to forget． 17．The old lady told her husband to get her a bowl of rice after they got home．18．The old lady told her husband to write something down．but he refused．19．The husband could remember clearly what to do before he went to the kitchen．20．From the story we can learn that the old lady was less forgetful than her husband．
