河南省郑州市中牟县第一高级中学2019-2020学年高一下学期期中模拟(二)物理试卷
河南省郑州市中牟县第一高级中学2019-2020学年高一下学期第二次限时练考试物理试题(PDF版)
和 B 星的质量分别为 m1 和 m2 ，相距为 d .下列说法正确的是（
）
A．
A
星的轨道半径为
m1 m1 m2
d
B． A 星和 B 星的线速度之比为 m1 : m2
C．若在 O 点放一个质点，它受到的合力一定为零
D．若 A 星所受 B 星的引力可等效为位于 O 点处质量为 m 的星体对它的引力，则
中牟县第一高级中学2019-2020高一下学期第二次考试物理
一、选择题（1-8 单选，9-12 多选，每题 4 分，多选题错选多选为 0 分，少选 2 分） 1．关于匀速圆周运动，以下说法正确的是（ ）
A．匀速圆周运动是匀速运动
B．匀速圆周运动是变加速曲线运动
C．匀速圆周运动线速度 v、周期 T 都是恒量
D．匀速圆周运动向心加速度 a 是恒量，线速度 v 方向时刻改变
2．某行星绕恒星运行的椭圆轨道如下图所示，E 和 F 是椭圆的两个焦点，O 是椭圆的中心，
行星在 A 点的线速度比在 B 点的线速度大．则恒星位于（ ）
A．A 点
B．E 点
C．F 点
D．O 点
3．我国的“神舟”系列航天飞船的成功发射和顺利返回，显示了我国航 m2
2
5．如图所示，A、B 叠放着，A 用绳系在固定的墙上，用力 F 拉着 B 右移，用 F′、FAB 和
FBA 分别表示绳对 A 的拉力、A 对 B 的摩擦力和 B 对 A 的摩擦力，则（ ） A．F 做正功，FAB 做负功，FBA 做正功，F′不做功 B．F 和 FBA 做正功，FAB 和 F′做负功 C．F 做正功，其他力都不做功 D．F 对 A 做正功，FAB 对 B 做负功，FBA 和 F′对 A 都不做功
就 . 已知地球的质量为 M，引力常量为 G，飞船的质量为 m，设飞船绕地球做匀速圆周运动
河南省郑州市中牟县第一高级中学2019-2020高一下学期第二次限时练考试英语试卷word版
英语试卷第Ⅰ卷第一部分：听力（略）第二部分：阅读理解（共两节，满分40分）(出题人：廖孙莹审题人：李培) 第一节（共15小题；每小题2分，满分30分）AEngland has been the birthplace of most of the great English-language theatre written throughout history. Most of the plays in England that are truly famous have something in common. They usually come from a playwright (剧作家) with several famous plays.ShakespeareWilliam Shakespeare is considered the most famous British playwright. Shakespeare has a large catalogue (目录) of tragedies, comedies and history plays, and each category is home to some of the most famous plays ever written. Hamlet, Macbeth, Romeo and Juliet, Othello and Julius Caesar are all tragedies and performed in theatres around the world every year. Famous comedies include A Midsummer Night's Dream and Much Ado About Nothing. In the history category, Richard Ⅲ and HenryⅤ are very famous.Oscar Wilde and George Bernard ShawSeveral hundred years after Shakespeare, English people began to enjoy the works of Oscar Wilde and George Bernard Shaw. Wilde's plays are still popular now, and The Importance of Being Earnest is both performed and studied extremely frequently. A Woman of No Importance and An Ideal Husband are among his other famous works. Shaw and Wilde were born within a few years of each other, but Shaw was a much more productive writer. His most famous plays include Pygmalion and Candida. Shaw's plays are loved so much that an entire theatre company is devoted to performing his works in Niagara-on-the-Lake in southern Ontario.Harold PinterThe plays of Harold Pinter certainly have an international presence. His writing was so widely recognized for its importance that he was awarded the Nobel Prize in Literature in 2005. Pinter is especially known for his style of writing. Many of his plays such as Betrayal, The Dumb Waiter and his first play, The Room, are extremely well known.21. The writer wrote this passage to ________．A．advise us to spend more time enjoying playsB．explain why England has so many wonderful playsC．tell us about some famous British playwrights and their worksD．tell us the differences among some British playwrights22. What do the works in the underlined part in Paragraph 2 have in common?A．They are all Shakespeare's early works.B．They are all tragedies written by Shakespeare.C．They are all Shakespeare's famous comedies.D．They all belong to the history category of Shakespeare's plays.23. Which of the following plays were most probably written in the same period of time?A．The Dumb Waiter and A Woman of No Importance.B．RichardⅢ and A Woman of No Importance.C．An Ideal Husband and Candida.D．Candida and Betrayal.BBad news sells. If it bleeds, it leads. No news is good news, and good news is no news. Those are the classic rules for the evening broadcasts and the morning papers. But now that information is being spread and monitored in different ways, researchers are discovering new rules. By tracking people's e-mails and online posts, scientists have found that good news can spread faster and farther than disasters and sob stories.“The ‘if it bleeds’ rule works for mass media，” says Jonah Berger, a scholar at the University of Pennsylvania. “They want your eyeballs and don't care howyou're feeling. But when you share a story with your friends, you care a lot more how they react. You d on't want them to think of you as a Debbie Downer.”Researchers analyzing word-of-mouth communication—e-mails, Web posts and reviews, face-to-face conversations—found that it tended to be more positive than negative, but that didn't necessarily mean people preferred positive news. Was positive news shared more often simply because people experienced more good things than bad things? To test for that possibility, Dr Berger looked at how people spread a particular set of news stories: thousands of articles on The Ne w York Times' website. He and a Penn colleague analyzed the “most e-mailed” list for six months. One of his first findings was that articles in the science section were much more likely to make the list than non-science articles. He found that science amazed Times' readers and made them want to share this positive feeling with others.Readers also tended to share articles that were exciting or funny, or that inspired negative feelings like anger or anxiety, but not articles that left them merely sad. They needed to be aroused one way or the other, and they preferred good news to bad. The more positive an article, the more likely it was to be shared, as Dr Berger explains in his new book, Contagious: Why Things Catch On.24．What do the classic rules mentioned in the text apply to?A．Daily conversations.B．Research papers.C．Private e-mails. D．News reports.25．What can we infer about people like Debbie Downer?A．They're socially inactive. B．They're inconsiderate of others.C．They're good at telling stories. D．They're careful with their words.26．Which tended to be the most e-mailed according to Dr Berger's research?A．Personal accounts. B．Financial reviews.C．Science articles. D．Sports news.27．What can be a suitable title for the text?A．Sad stories actually travel far and wideB．Reading habits change with the timesC．Good news beats bad on social networksD．Online news indeed attracts more peopleCThese days, people who do manual (体力的) work often receive far more money than people who work in offices. People who work in offices are frequently referred to as “white-collar workers” for the simple reason that they usually wear a collar and tie to go to work. Such is human nature, that a great many people are often willing to sacrifice higher pay for the honor of becoming white-collar workers. This can lead to curious situations, as it did in the case of Alfred Bloggs who worked as a dustman for the Ellesmere Corporation.When he got married, Alf was too embarrassed to say anything to his wife about his job. He simply told her that he worked for the Corporation. Every morning, he left home dressed in a smart black suit. He then changed into overalls (工作服) and spent the next eight hours as a dustman. Before returning home at night, he took a shower and changed back into his suit. Alf did this for over two years and his fellow dustmen kept his secret. Alf’s wife has never discovered that she married a dustman and she never will, for Alf has just found another job. He will soon be working in an office. He will be earning only half as much as he used to, but he feels that his rise in status (身份；地位) is well worth the loss of money. From now on, he will wear a suit all day and others will call him ‘Mr. Bloggs’, not ‘Alf’.28.What does the case of Alfred Bloggs show?A. That people often care more about the status of a job than the income.B. That “white-collar workers” usually wear a suit to go to work.C. That manual workers prefer to keep their jobs a secret.D. That office workers earn less than manual workers.29.What did Alfred Bloggs do for over two years?A. He told his wife he worked for the Corporation, when in fact he did not.B. He dressed himself as a dustman before leaving home every morning.C. He lied to his wife about his job.D. He earned twice as much as a white-collar worker.30.What does Alfred Bloggs think of his new job?A. He feels it is a pity because he now earns less than before.B. He thinks it is worthwhile for his rise in status.C. He is proud because he earns much more than before.D. He is satisfied because he no longer needs a shower before returning home.31.What’s the best title of the passage?A. The Double Life of Alfred Bloggs.B. Money or Status, Which Comes First?C. The Story of Alfred Bloggs, a Dustman.D. Truth Will Come to Light Sooner or Later.DIt’s 2035. You have a job, a family and you’re about 40 years old. Welcome to our future life.Getting ready for work, you pause in front of the mirror. “Turn red,” you say. Your shirt changes from sky blue to deep red. Tiny preprogrammed electronics (智能电子元件) are rearranged in your shirt to change its color. Looking into the mirror, you find it hard to believe you’re 40. You look much younger. With amazing advances in medicine, people i n your generation may live to be 150 years old. You’re not even middle aged!As you go into the kitchen and prepare to pour your breakfast cereal（谷物）into a bowl, you hear, “To lose weight, you shouldn’t eat that,” from your shoes. They read the tiny electronic code on the cereal box to find out the nutrition details. You decide to listen to your shoes. “Kitchen, what can I have for breakfast?” A list of possible foods appears on the counter as the kitchen cheeks its food supplies.“Ready for your trip to space,” you ask your son and daughter. In 2005 only specially-trained astronauts went into space---and very few of them. Today anyone can go to space for day trips or longer vacations. Your best friend even works in space. Handing your children three strawb erries each, you add, “The doctor said you need these for space travel.” Thanks to medical advances, vaccination shots (防疫针) are athing of the past. Ordinary foods contain specific vaccines(疫苗). With the strawberries in their mouths, the kids head for the front door.It’s time for you to go to work. Your car checks your fingerprints and unlocks the doors. “My office, autopilot,” you command. Your car drives itself down the road and move smoothly into traffic on the highway. You sit back and unroll your e-newspaper. The latest news downloads and fills the viewer. Looking through the pages, you watch the news as video film rather than read it.32.What changes the color of your shirt?A. The mirror.B. The shirt itselfC. The counter.D. The medicine.33.How do the shoes know that you shouldn’t eat the breakfast cereal?A. By pouring the breakfast into a bowl.B. By listening to the doctor’s advice.C. By testing the food supplies in the kitchen.D. By checking the nutrition details of the food.34.The strawberries the children eat serve as ______.A. breakfastB. lunchC. vaccinesD. nutrition35.How is the text organized?A. In order of time.B. In order of frequency.C. In order of preference.D. In order of importance.第二节（共5小题；每小题2分，满分10分）（出题人：梁涛审题人：赵聪）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。
河南省郑州市中牟县第一高级中学2019-2020学年高一下学期第二次限时练考试英语试题+Word版含答案
英语试卷第Ⅰ卷第一部分：听力（略）第二部分：阅读理解（共两节，满分40分）(出题人：廖孙莹审题人：李培)第一节（共15小题；每小题2分，满分30分）AEngland has been the birthplace of most of the great English-language theatre written throughout history. Most of the plays in England that are truly famous have something in common. They usually come from a playwright (剧作家) with several famous plays.ShakespeareWilliam Shakespeare is considered the most famous British playwright. Shakespeare has a large catalogue (目录) of tragedies, comedies and history plays, and each category is home to some of the most famous plays ever written. Hamlet, Macbeth, Romeo and Juliet, Othello and Julius Caesar are all tragedies and performed in theatres around the world every year. Famous comedies include A Midsummer Night's Dream and Much Ado About Nothing. In the history category, Richard Ⅲand HenryⅤare very famous.Oscar Wilde and George Bernard ShawSeveral hundred years after Shakespeare, English people began to enjoy the works of Oscar Wilde and George Bernard Shaw. Wilde's plays are still popular now, and The Importance of Being Earnest is both performed and studied extremely frequently. A Woman of No Importance and An Ideal Husband are among his other famous works. Shaw and Wilde were born within a few years of each other, but Shaw was a much more productive writer. His most famous plays include Pygmalion and Candida. Shaw's plays are loved so much that an entire theatre company is devoted to performing his works in Niagara-on-the-Lake in southern Ontario.Harold PinterThe plays of Harold Pinter certainly have an international presence. His writing was so widely recognized for its importance that he was awarded the Nobel Prize in Literature in 2005. Pinter is especially known for his style of writing. Many of his plays such as Betrayal, The Dumb Waiter and his first play, The Room, are extremely well known.21. The writer wrote this passage to ________．A．advise us to spend more time enjoying playsB．explain why England has so many wonderful playsC．tell us about some famous British playwrights and their worksD．tell us the differences among some British playwrights22. What do the works in the underlined part in Paragraph 2 have in common?A．They are all Shakespeare's early works.B．They are all tragedies written by Shakespeare.C．They are all Shakespeare's famous comedies.D．They all belong to the history category of Shakespeare's plays.23. Which of the following plays were most probably written in the same period of time?A．The Dumb Waiter and A Woman of No Importance.B．RichardⅢ and A Woman of No Importance.C．An Ideal Husband and Candida.D．Candida and Betrayal.BBad news sells. If it bleeds, it leads. No news is good news, and good news is no news. Those are the classic rules for the evening broadcasts and the morning papers. But now that information is being spread and monitored in different ways, researchers are discovering new rules. By tracking people's e-mails and online posts, scientists have found that good news can spread faster and farther than disasters and sob stories.“The ‘if it bleeds’ rule works for mass media，” says Jonah Berger, a scholar at the University of Pennsylvania. “They want your eyeballs and don't care how you're feeling. But when you share a story with your friends, you care a lot more how they react. Y ou don't want them to think of you as a Debbie Downer.”Researchers analyzing word-of-mouth communication—e-mails, Web posts and reviews, face-to-face conversations—found that it tended to be more positive than negative, but that didn't necessarily mean people preferred positive news. Was positive news shared more often simply because people experienced more good things than bad things? To test for that possibility, Dr Berger looked at how people spread a particular set of news stories: thousands of articles on The Ne w York Times' website. He and a Penn colleague analyzed the “most e-mailed”list for six months. One of his first findings was that articles in the science section were much more likely to make the list than non-science articles. He found that science amazed Times' readers and made them want to share this positive feeling with others.Readers also tended to share articles that were exciting or funny, or that inspired negative feelings like anger or anxiety, but not articles that left them merely sad. They needed to be aroused one way or the other, and they preferred good news to bad. The more positive an article, the more likely it was to be shared, as Dr Berger explains in his new book, Contagious: Why Things Catch On.24．What do the classic rules mentioned in the text apply to?A．Daily conversations.B．Research papers.C．Private e-mails. D．News reports.25．What can we infer about people like Debbie Downer?A．They're socially inactive. B．They're inconsiderate of others.C．They're good at telling stories. D．They're careful with their words.26．Which tended to be the most e-mailed according to Dr Berger's research?A．Personal accounts. B．Financial reviews.C．Science articles. D．Sports news.27．What can be a suitable title for the text?A．Sad stories actually travel far and wideB．Reading habits change with the timesC．Good news beats bad on social networksD．Online news indeed attracts more peopleCThese days, people who do manual (体力的) work often receive far more money than people who work in offices. People who work in offices are frequently referred to as “white-collar workers” for the simple reason that they usually wear a collar and tie to go to work. Such is human nature, that a great many people are often willing to sacrifice higher pay for the honor of becoming white-collar workers. This can lead to curious situations, as it did in the case of Alfred Bloggs who worked as a dustman for the Ellesmere Corporation.When he got married, Alf was too embarrassed to say anything to his wife about his job. He simply told her that he worked for the Corporation. Every morning, he left home dressed in a smart black suit. He then changed into overalls (工作服) and spent the next eight hours as a dustman. Before returning home at night, he took a shower and changed back into his suit. Alf did this for over two years and his fellow dustmen kept his secret. Alf’s wife has never discovered that she married a dustman and she never will, for Alf has just found another job. He will soon be working in an office. He will be earning only half as much as he used to, but he feels that his rise in status (身份；地位) is well worth the loss of money. From now on, he will wear a suit all day and others will call him ‘Mr. Bloggs’, not ‘Alf’.28.What does the case of Alfred Bloggs show?A. That people often care more about the status of a job than the income.B. That “white-collar workers” usually wear a suit to go to work.C. That manual workers prefer to keep their jobs a secret.D. That office workers earn less than manual workers.29.What did Alfred Bloggs do for over two years?A. He told his wife he worked for the Corporation, when in fact he did not.B. He dressed himself as a dustman before leaving home every morning.C. He lied to his wife about his job.D. He earned twice as much as a white-collar worker.30.What does Alfred Bloggs think of his new job?A. He feels it is a pity because he now earns less than before.B. He thinks it is worthwhile for his rise in status.C. He is proud because he earns much more than before.D. He is satisfied because he no longer needs a shower before returning home.31.What’s the best title of the passage?A. The Double Life of Alfred Bloggs.B. Money or Status, Which Comes First?C. The Story of Alfred Bloggs, a Dustman.D. Truth Will Come to Light Sooner or Later.DIt’s 2035. You have a job, a family and you’re about 40 years old. Welcome to our future life.Getting ready for work, you pause in front of the mirror. “Turn red,” you say. Your shirt changes from sky blue to deep red. Tiny preprogrammed electronics (智能电子元件) are rearranged in your shirt to change its color. Looking into the mirror, you find it hard to believe you’re 40. You look much younger. With amazing advances in medicine, peop le in your generation may live to be 150 years old. You’re not even middle aged!As you go into the kitchen and prepare to pour your breakfast cereal（谷物）into a bowl, you hear, “To lose weight, you shouldn’t eat that,” from your shoes. They read the tiny electronic code on the cereal box to find out the nutrition details. You decide to listen to your shoes. “Kitchen, what can I have for breakfast?” A list of possible foods appears on the counter as the kitchen cheeks its food supplies.“Ready for your trip to space,” you ask your son and daughter. In 2005 only specially-trained astronauts went into space---and very few of them. Today anyone can go to space for day trips or longer vacations. Your best friend even works in space. Handing your children three st rawberries each, you add, “The doctor said you need these for space travel.” Thanks to medical advances, vaccination shots (防疫针) are a thing of the past. Ordinary foods contain specific vaccines(疫苗). With the strawberries in their mouths, the kids head for the front door.It’s time for you to go to work. Your car checks your fingerprints and unlocks the doors. “My office, autopilot,” you command. Your car drives itself down the road and move smoothly into traffic on the highway. You sit back and unroll your e-newspaper. The latest news downloads and fills the viewer. Looking through the pages, you watch the news as video film rather than read it.32.What changes the color of your shirt?A. The mirror.B. The shirt itselfC. The counter.D. The medicine.33.How do the shoes know that you shouldn’t eat the breakfast cereal?A. By pouring the breakfast into a bowl.B. By listening to the doctor’s advice.C. By testing the food supplies in the kitchen.D. By checking the nutrition details of the food.34.The strawberries the children eat serve as ______.A. breakfastB. lunchC. vaccinesD. nutrition35.How is the text organized?A. In order of time.B. In order of frequency.C. In order of preference.D. In order of importance.第二节（共5小题；每小题2分，满分10分）（出题人：梁涛审题人：赵聪）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。
河南省郑州市中牟县第一高级中学2019-2020高一下学期第二次限时练考试化学试卷word版
河南省郑州市中牟县第一高级中学2019-2020高一下学期第二次限时练考试化学试卷word版化学试卷可能用到的相对原子质量：H-1 C-12 O-16 Mg-24 Al-27 S-32 Cl-35.5 Ca-40一、选择题：(本题共16小题，每小题3分，共48分)1、2016年IUPAC命名117号元素为Ts(中文名“”，tián)，Ts的原子核外最外层电子数是7，下列说法不正确的是()A．Ts是第7周期ⅦA族元素B．Ts的同位素原子具有相同的电子数C．Ts在同族元素中非金属性最弱D．中子数为176的Ts核素符号是176117Ts2、下列有关结构和性质的说法中，正确的是()A．因酸性：HCl>H2S，故非金属性：Cl>SB．元素原子的最外层电子数越多，越容易得电子，非金属性越强C．同周期主族元素的原子形成的简单离子电子层结构相同D．同周期ⅡA族与ⅢA族的元素原子序数之差不一定为13、下列有关化学用语正确的是()A．NH4Cl的电子式：B．S原子的结构示意图：C．N2的电子式：D．质子数为26、中子数为30的铁原子：5626Fe4、设N A为阿伏加德罗常数的值，下列说法正确的是（）A. 16g18O2的中子数为10N AB. 1.9g1H37Cl的电子数为0.9N AC. 7.0g35Cl2的体积为2.24LD. 35Cl2的摩尔质量为70g5、下列叙述中正确的是（）A. 周期表中第15列元素的最高价氧化物对应水化物的化学式均为H3RO4B. O22-与S2－具有相同的质子数和电子数C. 所有主族元素的最高正价均与其族序数相等D. 若R2－和M+ 的电子层结构相同，则原子序数：R＞M6、已知短周期元素的离子A2+、B+、C2－、D－都具有相同的电子层结构，则下列叙述正确的是（）A．原子半径：A﹥B﹥D﹥C B．原子序数：D﹥C﹥B﹥AC．离子半径：C2－﹥D－﹥B+﹥A2+ D．原子的最外层电子数：A﹥B﹥D﹥C7、已知某元素的阴离子为R n－，原子核内的中子数为A-x＋n，原子的质量数为A，则m克R n－的电子总数为（N A表示阿伏加德罗常数）（）A．m A xANA()-B．A x nA mNA---C．m xANAD．m A xANA ++8、X、Y、Z、M、Q、R皆为前20号元素，其原子半径与化合价的关系如图所示。
河南省郑州市中牟县第一高级中学2019_2020学年高一英语下学期第二次限时练考试试题
河南省郑州市中牟县第一高级中学2019-2020学年高一英语下学期第二次限时练考试试题第Ⅰ卷第一部分：听力（略）第二部分：阅读理解（共两节，满分40分）第一节（共15小题；每小题2分，满分30分）AEngland has been the birthplace of most of the great Englishlanguage theatre written throughout history. Most of the plays in England that are truly famous have something in common. They usually come from a playwright (剧作家) with several famous plays.ShakespeareWilliam Shakespeare is considered the most famous British playwright. Shakespeare has a large catalogue (目录) of tragedies, comedies and history plays, and each category is home to some of the most famous plays ever written. Hamlet, Macbeth, Romeo and Juliet, Othello and Julius Caesar are all tragedies and performed in theatres around the world every year. Famous comedies include A Midsummer Night's Dream and Much Ado About Nothing. In the history category, Richard Ⅲ and HenryⅤ are very famous.Oscar Wilde and George Bernard ShawSeveral hundred years after Shakespeare, English people began to enjoy the works of Oscar Wilde and George Bernard Shaw. Wilde's plays are still popular now, and The Importance of Being Earnest is both performed and studied extremely frequently. A Woman of No Importance and An Ideal Husband are among his other famous works. Shaw and Wilde were born within a few years of each other, but Shaw was a much more productive writer. His most famous plays include Pygmalion and Candida. Shaw's plays are loved so much that an entire theatre company is devoted to performing his works in NiagaraontheLake in southern Ontario.Harold PinterThe plays of Harold Pinter certainly have an international presence. His writing was so widely recognized for its importance that he was awarded the Nobel Prize in Literature in 2005. Pinter is especially known for his style of writing. Many of his plays such as Betrayal, The Dumb Waiter and his first play, The Room, are extremely well known.21. The writer wrote this passage to ________．A．advise us to spend more time enjoying playsB．explain why England has so many wonderful playsC．tell us about some famous British playwrights and their worksD．tell us the differences among some British playwrights22. What do the works in the underlined part in Paragraph 2 have in common?A．They are all Shakespeare's early works.B．They are all tragedies written by Shakespeare.C．They are all Shakespeare's famous comedies.D．They all belong to the history category of Shakespeare's plays.23. Which of the following plays were most probably written in the same period of time?A．The Dumb Waiter and A Woman of No Importance.B．RichardⅢ and A Woman of No Importance.C．An Ideal Husband and Candida.D．Candida and Betrayal.BBad news sells. If it bleeds, it leads. No news is good news, and good news is no news. Those are the classic rules for the evening broadcasts and the morning papers. But now that information is being spread and monitored in different ways, researchers are discovering new rules. By tracking people's emails and online posts, scientists have found that good news can spread faster and farther than disasters and sob stories.“The ‘if it bleeds’ rule works for mass media，” says Jonah Berger, a scholar at the University of Pennsylvania. “They want your eyeballs and don't care how you're feeling. But when you share a story with your friends, you care a lot more how they react. You don't want them to think of you as a Debbie Downer.”Researchers analyzing wordofmouth communication—emails, Web posts and reviews, facetoface conversations—found that it tended to be more positive than negative, but that didn't necessarily mean people preferred positive news. Was positive news shared more often simply because people experienced more good things than bad things? To test for that possibility, Dr Berger looked at how people spread a particular set of news stories: thousands of articles on The New York Times' website. He and a Penn colleague analyzed the “most emailed” list for six months. One of his first findings was that articles in the science section were much more likely to make the list than nonscience articles. He found that science amazed Times' readers and made them want to share this positive feeling with others.Readers also tended to share articles that were exciting or funny, or that inspired negative feelings like anger or anxiety, but not articles that left them merely sad. They needed to be aroused one way or the other, and they preferred good news to bad. The more positive an article, the more likely it was to be shared, as Dr Berger explains in his new book, Contagious: Why Things Catch On.24．What do the classic rules mentioned in the text apply to?A．Daily conversations. B．Research papers.C．Private emails. D．News reports.25．What can we infer about people like Debbie Downer?A．They're socially inactive. B．They're inconsiderate of others.C．They're good at telling stories. D．They're careful with their words.26．Which tended to be the most emailed according to Dr Berger's research?A．Personal accounts. B．Financial reviews.C．Science articles. D．Sports news.27．What can be a suitable title for the text?A．Sad stories actually travel far and wideB．Reading habits change with the timesC．Good news beats bad on social networksD．Online news indeed attracts more peopleCThese days, people who do manual (体力的) work often receive far more money than people who work in offices. People who work in offices are frequently referred to as “white-collar workers” for the simple reason that they usually wear a collar and tie to go to work. Such is human nature, that a great many people are often willing to sacrifice higher pay for the honor of becoming white-collar workers. This can lead to curious situations, as it did in the case of Alfred Bloggs who worked as a dustman for the Ellesmere Corporation.When he got married, Alf was too embarrassed to say anything to his wife about his job. He simply told her that he worked for the Corporation. Every morning, he left home dressed in a smart black suit. He then changed into overalls (工作服) and spent the next eight hours as a dustman. Before returning home at night, he took a shower and changed back into his suit. Alf did this for over two years and his fellow dustmen kept his secret. Alf’s wife has never discovered that she married a dustman and she never will, for Alf has just found another job. He will soon be working in an office. He will be earning only half as much as he used to, but he feels that his rise in status (身份；地位) is well worth the loss of money. From now on, he will wear a suit all day and others will call him ‘Mr. Bloggs’, not ‘Alf’.28.What does the case of Alfred Bloggs show?A. That people often care more about the status of a job than the income.B. That “white-collar workers” usually wear a suit to go to work.C. That manual workers prefer to keep their jobs a secret.D. That office workers earn less than manual workers.29.What did Alfred Bloggs do for over two years?A. He told his wife he worked for the Corporation, when in fact he did not.B. He dressed himself as a dustman before leaving home every morning.C. He lied to his wife about his job.D. He earned twice as much as a white-collar worker.30.What does Alfred Bloggs think of his new job?A. He feels it is a pity because he now earns less than before.B. He thinks it is worthwhile for his rise in status.C. He is proud because he earns much more than before.D. He is satisfied because he no longer needs a shower before returning home.31.What’s the best title of the passage?A. The Double Life of Alfred Bloggs.B. Money or Status, Which Comes First?C. The Story of Alfred Bloggs, a Dustman.D. Truth Will Come to Light Sooner or Later.DIt’s 2035. You have a job, a family and you’re about 40 years old. Welcome to our future life.Getting ready for work, you pause in front of the mirror. “Turn red,” you say. Your shirt changes from sky blue to deep red. Tiny preprogrammed electronics (智能电子元件) are rearranged in your shirt to change its color. Looking into the mirror, you find it hard to believe you’re 40. You look much younger. With amazing advances in medicine, people in y our generation may live to be 150 years old. You’re not even middle aged!As you go into the kitchen and prepare to pour your breakfast cereal（谷物） into a bowl, you hear, “To lose weight, you shouldn’t eat that,” from your shoes. They read the tiny electronic code on the cereal box to find out the nutrition details. You decide to listen to your shoes. “Kitchen, what can I have for breakfast?” A list of possible foods appears on the counter as the kitchen cheeks its food supplies.“Ready for your trip to space,” you ask your son and daughter. In 2005 only specially-trained astronauts went into space---and very few of them. Today anyone can go to space for day trips or longer vacations. Your best friend even works in space. Handing your children three strawberr ies each, you add, “The doctor said you need these for space travel.” Thanks to medical advances, vaccination shots (防疫针) are a thing of the past. Ordinary foods contain specific vaccines(疫苗). With the strawberries in their mouths, the kids head for the front door.It’s time for you to go to work. Your car checks your fingerprints and unlocks the doors. “My office, autopilot,” you command. Your car drives itself down the road and move smoothly into traffic on the highway. You sit back and unroll your e-newspaper. The latest news downloads and fills the viewer. Looking through the pages, you watch the news as video film rather than read it.32.What changes the color of your shirt?A. The mirror.B. The shirt itselfC. The counter.D. The medicine.33.How do the shoes know that you shouldn’t eat the breakfast cereal?A. By pouring the breakfast into a bowl.B. By listening to the doctor’s advice.C. By testing the food supplies in the kitchen.D. By checking the nutrition details of the food.34.The strawberries the children eat serve as ______.A. breakfastB. lunchC. vaccinesD. nutrition35.How is the text organized?A. In order of time.B. In order of frequency.C. In order of preference.D. In order of importance.第二节（共5小题；每小题2分，满分10分）（出题人：梁涛审题人：赵聪）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。
河南省郑州市中牟县第一高级中学2019-2020学年高一下期中模拟考试化学试卷
化学可能用到的相对原子质量：H1、C12、O16、Si28一、单项选择（每小题只有一个选项符合题意，每题3分共48分）1.下列化学用语书写正确的是A.N2的结构式:N≡NB.氯离子的结构示意图:C.CO2的电子式:D.四氯化碳分子比例(填充)模型:2.目前，科学界拟合成一种“双重结构”的球形分子，即将球形C60容纳在球形Si60中形成的分子，外面的硅原子与里面的碳原子以共价键结合。
关于这种“双重结构”的球形分子，下列叙述正确的是A.一个“双重结构”的分子实际上是两个分子B.该“双重结构”分子内的原子间既有极性键又有非极性键存在C.该物质是混合物D.该物质的摩尔质量为24003.下列有关离子键与共价键的说法中，正确的是A.只含共价键的物质不一定是共价化合物B.单质中一定没有离子键，一定有共价键C.共价键通过原子之间得失电子形成D.非金属元素组成的化合物中不可能有离子键4.下列反应一定属于放热反应的是①H2SO4与Ba(OH)2溶液的反应②Mg与CH3COOH溶液的反应③燃烧反应④中和反应⑤复分解反应⑥分解反应⑦氧化还原反应⑧置换反应A.仅①②③B.仅①②③④⑦⑧C.仅①②③④D.仅①②③④⑤⑧5.等质量的以下四种烃完全燃烧，消耗氧气的量最多的是A.CH4B.C2H6C.C3H6D.C6H66.下列说法中正确的是①离子化合物中一定有离子键，可能有共价键②离子化合物都属于强电解质③非金属单质中不含离子键，一定只含有共价键④稳定性:HCl＞HI，沸点:Br2＜I2，酸性:HF＞HCl⑤NaCl 和HCl 溶于水破坏相同的作用力⑥共价键可能存在于非金属单质中，也可能存在于离子化合物或共价化合物中A.①②⑥B.①②④⑥C.③④⑤⑥D.①④⑤7.用氮化硅(Si3N4)陶瓷代替金属制造发动机的耐热部件，能大幅度提高发动机的热效率。
工业上用化学气相沉积法制备氮化硅，其反应如下:3SiCl4(g)＋2N2(g)＋6H2(g)Si3N4(s)＋12HCl(g)(放热反应)一定条件下，在密闭恒容的容器中，能表示上述反应达到化学平衡状态的是A.3v逆(N2)＝2v正(H2) B.v(HCl)＝4v(SiCl4)C.混合气体密度保持不变D.c(N2)∶c(H2)∶c(HCl)＝1∶3∶68.下列实验装置图正确的是A.装置①可用于证明硫、碳、硅的非金属性强弱B.可用装置②做金属钾与水反应的实验C.操作③可用于浓硫酸的稀释D.装置④可证明非金属性:氯>溴>碘9.已知空气－锌电池的电极反应为锌片:Zn＋2OH－－2e－===ZnO＋H2O；碳棒:12O2＋H2O＋2e－===2OH－，据此判断，锌片是A.正极并被还原B.正极并被氧化C.负极并被还原D.负极并被氧化10.已知键能是指断开1mol气态分子形成原子所吸收的能量或原子形成1mol气态分子释放的能量。
河南省郑州市中牟县第一高级中学2019-2020学年高一(下)期中模拟物理试题(wd无答案)
河南省郑州市中牟县第一高级中学2019-2020学年高一（下）期中模拟物理试题一、单选题(★★) 1. 如图所示，在皮带传送装置中，皮带把物体P匀速带至高处，在此过程中，下列说法正确的是（）A．重力对物体做正功B．支持力对物体做正功C．摩擦力对物体做正功D．合外力对物体做正功(★★★) 2. 如图所示为质点做匀变速曲线运动轨迹的示意图，且质点运动到 D点时速度方向与加速度方向恰好互相垂直，则质点从A点运动到E点的过程中，下列说法中正确的是（）A．质点经过C点的速率比D点的大B．质点经过A点时的加速度方向与速度方向的夹角小于90°C．质点经过D点时的加速度比B点的大D．质点从B到E的过程中加速度方向与速度方向的夹角先增大后减小(★★★) 3. 2019年5月17日，我国成功发射第45颗北斗导航卫星，该卫星属于地球静止轨道卫星（同步卫星）．该卫星A．入轨后可以位于北京正上方B．入轨后的速度大于第一宇宙速度C．发射速度大于第二宇宙速度D．若发射到近地圆轨道所需能量较少(★) 4. 2018年12月8日，肩负着亿万中华儿女探月飞天梦想的嫦娥四号探测器成功发射，“实现人类航天器首次在月球背面巡视探测，率先在月背刻上了中国足迹”．已知月球的质量为、半径为，探测器的质量为，引力常量为，嫦娥四号探测器围绕月球做半径为的匀速圆周运动时，探测器的（）A．周期为B．动能为C．角速度为D．向心加速度为(★★★) 5. 2017年4月，我国成功发射的天舟一号货运飞船与天宫二号空间实验室完成了首次交会对接，对接形成的组合体仍沿天宫二号原来的轨道（可视为圆轨道）运行．与天宫二号单独运行时相比，组合体运行的：（）A．周期变大B．速率变大C．动能变大D．向心加速度变大(★★) 6. “神舟”六号载人飞船顺利发射升空后，经过115小时32分的太空飞行，在离地面约为430km的圆轨道上运行了77圈，运动中需要多次“轨道维持”。
河南省郑州市中牟县第一高级中学2019_2020学年高一历史下学期期中模拟试题(二)
河南省郑州市中牟县第一高级中学2019-2020学年高一历史下学期期中模拟试题（二）一、选择题（共30题,共60分，每题2分）1、下图是根据从河南辉县和山西长治出土的战国时期铁农具绘制的，从左至右分别为锄、斧、铲、犁铧。
这些农具的使用（）A. 缓解了人口与土地的尖锐矛盾B. 抑制了手工业和商业的发展C. 说明铁犁牛耕在全国范围推广D. 促进了精耕细作农业的发展2、《复活的兵团》解说，两千多年前的秦朝在统一后已按照“国标”大规模生产各类标准化兵器。
秦朝《工律》规定：“为器同物者，其大小、短长、广裹亦必等。
”材料反映秦朝（）A.民间手工业生产规范 B.军队装备世界领先C.官营手工业的标准化D.手工业生产水平高3、在中国封建社会，小农善于经营，可以“累其赢余，益市田数亩”，上升为自耕农或小地主，小地主经营得法，也能上升为大地主。
……不善经营，大地主也会下降为小地主，小地主破产为自耕农，乃至佃农，及身无立锥之地。
这说明A．封建经济发展缺乏稳定性 B．土地兼并是封建经济的顽疾C．自耕农是封建经济的主体 D．封建经济内隐存竞争因素4、西汉官员在谈到盐铁官营时指出：“笼天下盐铁诸利，以排（排挤）富商大贾……损有余，补不足，是以兵革东西征伐，赋敛不征而国用足。
”这表明盐铁官营A. 使政府获得经济与政治双重利益B. 基本解除了百姓的赋税负担C. 阻碍了社会商品经济的正常发展D. 以解决军费问题为主要目的5、下表为不同文献关于唐代土地状况的记述。
由此可以推知A．政府对土地的实际控制力有限 B．租佃经营基本取代自耕农经营C．土地的自由买卖得到法律保障 D．士农工商的社会结构发生变化6、唐代宗诏令“诸坊市街曲，有侵街打墙、接檐造舍等，先处分一切不许，并令毁拆”；宋真宗时店铺侵占通衢大道的情况屡禁不止；最终宋徽宗以征收“侵街房廊钱”的形式承认了这一行为的合法性。
这反映出( )A．宋代的法律体系比唐代更为完备B．“工商食官”的政策逐步受到削弱C．商业发展不断冲击传统坊市制度D．官府对商业活动的控制日趋严格7、明清是民间手工业的大发展时期。
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物理试题卷一、选择题（每题4分，共48分。
1~8题为单选，9~12为多选，多选题少选给一半分，错选、多选不给分。
）1．固定的光滑竖直杆上套着一个滑块，用轻绳系着滑块绕过光滑的定滑轮，以大小恒定的拉力F 拉绳，使滑块从A 点起由静止开始上升。
若从A 点上升至B 点和从B 点上升至C 点的过程中轻绳对滑块做的功分別为W 1和W 2，且AB=BC ，则（ ）A ．12W W >B ．12W W <C ．12W W =D ．无法确定W 1和W 2的大小关系2.宇宙中，两颗靠得比较近的恒星，只受到彼此之间的万有引力作用互相绕转，称之为双星系统，设某双星系统绕其连线上的O 点做匀速圆周运动，转动周期为T ，轨道半径分别为R A 、R B 且R A <R B ，引力常量G 已知，则下列说法正确的是（ ）A. 星球A 所受的向心力大于星球B 所受的向心力B. 星球A 的线速度一定等于星球B 的线速度C. 星球A 和星球B 的质量之和为224A B GT π（R +R ）D. 双星的总质量一定，双星之间的距离越大，其转动周期越大3．一滑块静止在水平面上，t ＝0时刻在滑块上施加一水平力F ，力F 和滑块的速度v 随时间t 的变化规律分别如图甲、乙所示，g 取10 m/s 2，则下列说法正确的是( ) A ．滑块的质量为2 kgB ．力F 在第3 s 内做的功为1.5 JC ．滑块与水平面间的动摩擦因数为0.3D ．力F 在第2 s 内做功的功率为2 W4．如图所示，在外力作用下某质点作直线运动的v-t 图像为正弦曲线。
从图中可以判断（ ） A ．在0~t 1时间内，外力做正功B ．在0~t 1时间内，外力的功率逐渐增大C ．在t 2时刻，外力的功率最大D ．在t 1~t 3时间内，外力做的总功不为零5．如图所示是北斗导航系统中部分卫星的轨道示意图，已知a 、b 、c 三颗卫星均做圆周运动，a 是地球同步卫星，则( )A．卫星a的角速度小于c的角速度B．卫星a的加速度大于b的加速度C．卫星a的运行速度大于第一宇宙速度D．卫星b的周期大于24 h6．如图所示，分别用恒力F1和F2先后将质量为m的物体从静止开始沿着同一个粗糙的固定斜面由低端推到顶端，第一次力F1的方向沿斜面向上，第二次力F2的方向沿水平向右，两次所用的时间相同，在这两个过程中（）A．F1和F2所做的功相同B．第二次物体机械能变化量较大C．第二次物体所受的合力做功较多D．物体的动能的变化量相同7．一飞船在某行星表面附近沿圆轨道绕该行星飞行。
认为行星是密度均匀的球体，要确定该行星的密度，只需要测量（）A．飞船的轨道半径B．飞船的运行速度C．飞船的运行周期D．行星的质量8．如图所示，某同学用硬塑料管和一个质量为m的铁质螺丝帽研究匀速圆周运动，将螺丝帽套在塑料管上，手握塑料管使其保持竖直并在水平方向做半径为r的匀速圆周运动，则只要运动角速度合适，螺丝帽恰好不下滑，假设螺丝帽与塑料管间的动摩擦因数为μ，认为最大静摩擦力近似等于滑动摩擦力。
则在该同学手转塑料管使螺丝帽恰好不下滑时，下述分析正确的是（）A．螺丝帽受的重力与最大静摩擦力平衡B．螺丝帽受到杆的管的角速度mgr ωμ=D．若杆的转动加快，螺丝帽有可能相对杆发生运动9．将月球、地球同步卫星及静止在赤道上的物体三者进行比较，下列说法正确的是（）A．三者都只受万有引力的作用，万有引力提供向心力B．地球同步卫星相对地心的线速度与静止在赤道上物体相对地心的线速度大小相等C．地球同步卫星与静止在赤道上物体的角速度相同D．月球的向心加速度小于地球同步卫星的向心加速度F2F110．如图所示，从倾角为θ的斜面上的某点先后将同一小球以不同初速度水平抛出，小球均落到斜面上，当抛出的速度为1v 时，小球到达斜面的速度方向与斜面的夹角为1α，当抛出的速度为2v 时，小球到达斜面的速度方向与斜面的夹角为2α，则（ ）A ．当12v v >时，12αα>B ．无论v 1、v 2大小如何，均有12αα=C ．2tan 2tan αθ=D ．tan()2tan αθθ+=11．如图所示，放于竖直面内的光滑金属细圆环半径为R ，质量为m 的带孔小球穿于环上，同时有一长为R 的细绳一端系于球上，另一端系于圆环最低点，绳能承受的最大拉力为2mg ．重力加速度的大小为g ，当圆环以角速度ω绕竖直直径转动时，下列说法正确的是 A ．圆环角速度ω小于g R 时，小球受到2个力的作用 B ．圆环角速度ω等于2g R时，细绳恰好伸直 C ．圆环角速度ω等于2g R时，细绳将断裂 D ．圆环角速度ω大于6g R 时，小球受到2个力的作用 12．溜索是一种古老的渡河工具，现已演变为游乐项目。
如图所示，滑轮、保险绳索与人体连接，粗钢索两端连接在固定桩上。
人从高处平台的A 点出发，借助几十米的落差，沿钢索顺势而下，滑过最低点C ，到达B 点时速度为零。
下列说法中正确的有（ ）A ．人滑到C 点时速度最大B ．人滑到C 点时的加速度方向竖直向上C ．人从A 滑到C 的过程中，人（包括滑轮、保险绳索）的机械能一直减小D ．人从A 滑到C 的过程中，人（包括滑轮、保险绳索）的重力的功率先增大后减小二．实验题(2小题共12分，13题8分，14题4分)13．在做研究平抛运动的实验时，让小球多次沿同一轨道运动，通过描点法画出小球平抛运动的轨迹．（1）为了能较准确地描绘运动轨迹，下面列出一些操作要求，将你认为正确选项的前面字母填在横线上：____________________．（a）通过调节使斜槽的末端保持水平（b）每次释放小球的位置必须不同（c）每次必须由静止释放小球（d）记录小球位置用的木条（或凹槽）每次必须严格地等距离下降（e）小球运动时不应与木板上的白纸（或复写纸）相接触（f）将球的位置记录在纸上后，取下纸，用直尺将点连成折线（2）一个同学在实验中，只画出了如图所示的一部分曲线，于是他在曲线上取水平距离s∆相等的三点A、B、C，量得s∆= 0. 2m．又量出它们之间的竖直距离分别为h1 = 0. 1m，h2 =0. 2m，利用这些数据，可求得：①物体抛出时的初速度为_________m/s；②物体经过B时竖直分速度为________m/s；③抛出点在A点上方高度为__________m处．14．某同学利用如图1所示的装置“探究合外力做功与物体动能变化的关系”，具体实验步骤如下:A．按照图示安装好实验装置，挂上砂桶（含少量砂子）。
B．调节长木板的倾角，轻推小车后，使小车沿长木板向下运动，且通过两个光电门的时间相等。
C．取下细绳和砂桶，测量砂子和桶的质量m，并记录数据。
D．保持长木板的倾角不变，将小车置于靠近滑轮的位置，由静止释放小车，记录小车先后通过光电门甲和乙时的时间t1、t2，并测量遮光条的宽度d，光电门甲、乙之间的距离为s.E.改变光电门甲、乙之间的距离，重复步骤D。
请回答下列各问题：（用题目所给字母表示）（1）若砂桶和砂子的总质量为m，小车的质量为M，重力加速度为g，则步骤D中小车下滑时所受合力大小为________。
（忽略空气阻力）（2）在误差允许的范围内，若满足__________，则表明物体所受合外力做的功等于物体动能变化量。
三、计算题15.（8分）如图所示，一轨道由半径为2 m 的四分之一竖直圆弧轨道AB 和长度可以调节的水平直轨道BC 在B 点平滑连接而成．现有一质量为0.2 kg 的小球从A 点无初速度释放，经过圆弧上的B 点时，传感器测得轨道所受压力大小为3.6 N ，小球经过BC 段所受阻力为其重力的0.2倍，然后从C 点水平飞离轨道，落到水平面上的P 点，P 、C 两点间的高度差为3.2 m ．小球运动过程中可以视为质点，且不计空气阻力．（1）求小球在圆弧轨道上克服摩擦力所做的功；（2）为使小球落点P 与B 点的水平距离最大，求BC 段的长度；16．（9分）如图所示，在某质量分布均匀的行星表面上有一个匀质转盘，转盘上两个质量均为m 的物体A 、B 位于圆心的同一侧，两物体A 、B 到圆心的距离分别为L 何2L,两物体A 、B 用一根轻绳连接，开始时轻绳恰好处于伸直状态，当角速度为ω时，两物体A 、B 刚要相对转盘发生相对滑动，两物体A 、B 与转盘间的动摩擦因数μ，最大静摩擦力等于滑动摩擦力。
已知行星的半径为R ，引力常量为G ，求：（1）两物体即将发生滑动时绳子上的拉力；（2）此行星的密度；（3）此行星的第一宇宙 速度。
A B17.（10分）质量均为m的物体A和B分别系在一根不计质量的细绳两端，绳子跨过固定在倾角为30º的斜面顶端的定滑轮上，斜面固定在水平地面上，开始时把物体B拉到斜面低端，这时物体A离地面的高度为0.8m。
若摩擦力均不计，从静止开始放手让它们运动（斜面足够长），求：（1）物体A着地时的速度；（2）物体A着地后物体B沿斜面上滑的最大距离。
18．（13分）如图所示，AB与CD是倾斜角为53°的两个对称的粗糙斜面，A与D，B与C 分别位于同一水平面上，两斜面与光滑圆弧轨道相切于B、C两点，E为轨道的最低点。
A、B两点间的高度差为h=1.5m，圆弧轨道的半径R=0.5m，滑块P的质量m=2kg，滑块与斜面间的动摩擦因数μ=0.05，重力加速度g取10m/s2，sin53°=0.8，cos53°=0.6，求：（1）滑块P至少以多大的初速度v0从A点下滑，才能冲上斜面CD到达D点？（2）若滑块P在A点由静止开始下滑，求它在两斜面上走过的总路程S？（3）若滑块P在A点由静止开始下滑，求其对轨道最低点E的最大压力和最小压力各为多少？AB30º物理答案一、选择题1.A2.D3.C4.A5.A6.D7. C8.A9.CD 10. BD 11. ABD 12. CD二、实验题13. (a)(c)(e) 2m/s 1.5 m/s 0.0125m14.【答案】mg （2分） mgs =2212d M t （）-2112d M t （） （2分） 【解析】(1)探究“小车的加速度与所受合外力的关系”中小车所受的合外力等于沙桶和沙子的总重力，则步骤D 中小车加速下滑时所受合力大小为mg ；(2)遮光片通过两个光电门1、2的速度分别为v 1=1d t 、v 2=2d t 故小车动能变化量为△E k =2212d M t （）-2112d M t （） 在误差允许的范围内，合外力做功等于物体动能的变化量，即mgs =2212d M t （）-2112d M t （） 三、计算题15（8分）【答案】（1）2.4J （2）3.36m【解析】（1）小球在B 点受到的重力与支持力的合力提供向心力，则：20N v F mg m R -=（1分） 代入数据可得：04/v m s =A 到B 的过程中重力和阻力做功，则由动能定理可得：20102f mgR W mv -=-（2分） 代入数据得： 2.4f W J =（1分）（2）B 到C 的过程中，由动能定理得：2201122BC c kmgL mv mv -=- （1分） 解得：2202c BCv v L kg -=从C 点到落地的时间：020.8h t s g==（1分） B 到P 的水平距离：22002c c v v L v t kg-=+（1分） 代入数据，联立并整理可得：214445c c L v v =-+ 可知．当 1.6/c v m s =时，P 到B 的水平距离最大，为L=3.36m （1分）16. (1) (2) (3) 17.（1）2m/s (2) 0.4m18．（共13分）（1）1.5m /s （2）50m （3）151.5N ； 36N【解析】（1）滑块恰好到达D 点时速度为零，根据动能定理有：-2μmg cos53°•53h sin =0-12mv 02………………………………2分 得：v 03gh μ解得：v 0=1.5m/s………………………………1分（2）最终滑块在光滑轨道上来回运动，且到达B 点和C 点时速度均为零，根据动能定理有：mgh -μmg co s53°•S =0-0………………………………2分解得：S =50m………………………………1分（3）设滑块经过E 点时的最小速率为v 1，最小支持力为N 1；最大速率为v 2，最大支持力为N 2。