您所在的当前位置：高中物理试题 >

冲量

> 【题文】质量为m的钢球自高处落下，以速率v 1碰地，竖直向上弹回，碰撞时间极短，离开地的速率为v 2．在碰撞过程中，钢球受到合力的冲量的方向和大小为（） A．向下，m（v1

问题：

发布时间：2024-09-10

【题文】质量为m的钢球自高处落下，以速率v ₁碰地，竖直向上弹回，碰撞时间极短，离开地的速率为v ₂．在碰撞过程中，钢球受到合力的冲量的方向和大小为（）

A．向下，m（v₁

参考答案：

提问用户：CE***MPs

可能感兴趣的题目：

1 下列叙述中，不正确的是（） A．汽油是有固定沸点的纯净物 B．煤是由有机物和无机物组成的复杂混合物 C．聚乙烯是通过加聚反应制得的高分子化合物 D．油脂是高级脂肪酸与甘油生成的酯
2 下列事件发生的先后顺序是 ①实行俸禄制 ②推行均田制 ③建立三长制 ④迁都洛阳 [ ] A．①②③④ B．①③②④ C．④①②③ D．④②①③
3 【题文】已知关于的方程在区间上有实数根，则实数的取值范围是
4 中国医科院肿瘤医院屠规益教授曾对学生说过:“是病人要做手术,不是医生需要, 所以一定要根据病情决定做不做，做大还是做小”、“不能只讲切切切！外科医生只知道怎么做手术是不行的，应该知道怎么不做手术。”屠教授的话蕴涵的哲理是 ①客观决定主观，一切从实际出发 ②任何治疗都要以人为本 ③要全面看问题，切忌片面性 ④事物的联系是客观的、普遍的 A．①② B．①③ C．②④ D．③④
5 Like most people, I was brought up to look upon life as a process of getting. It was not until in my late thirties that I made this important 1: giving-away makes life so much more exciting. You need not worry if you 2money. This is how I 3with giving-away. If an idea for improving the window display of a neighborhood store 4to me, I step in and make the suggestion to the 5. If an accident takes place, the 6of which I think the local police could use, I 7him up and tell him about it, though I am not in 8here. One discovery I made about this world is to give 9getting something back, though the 10often comes in an unexpected form. One Sunday morning the local post office delivered an important 11letter to my home, though it was 12to me at my office. I wrote the postmaster a note of 13. More than a year later I needed a post-office box for a new business I was 14. I was told at the window that there were 15boxes left, and that my name would have to go on a long 16list. As I was about to 17, the postmaster appeared in the 18.“Wasn’t it you that wrote us that letter a year ago about delivering a special delivery to your home?” I said it was. “Well, you certainly are going to have a box in this post office 19we make one for you. You don’t know what a letter like that means to us. We usually get 20but complaints(投诉).” decision,research,speech,discovery,decision,research,speech,discovery,earn,lack,spend,steal,earn,lack,spend,steal,experienced,connected,combined,agreed,experienced,connected,combined,agreed,happens,flashes,sticks,leads,happens,flashes,sticks,leads,postmaster,headmaster,storekeeper,policeman,postmaster,headmaster,storekeeper,policeman,story,damage,challenge,material,story,damage,challenge,material,call,hold,break,pick,call,hold,break,pick,need,trouble,common,charge,need,trouble,common,charge,within,without,for,before,within,without,for,before,process,goal,return,concern,process,goal,return,concern,curious,immediate,special,heavy,curious,immediate,special,heavy,realized,addressed,forgotten,brought,realized,addressed,forgotten,brought,invitation,apology,instruction,appreciation,invitation,apology,instruction,appreciation,dealing,providing,operating,starting,dealing,providing,operating,starting,enough,some,no,more,enough,some,no,more,admitting,relating,examining,waiting,admitting,relating,examining,waiting,leave,shout,guess,conduct,leave,shout,guess,conduct,window,doorway,library,yard,window,doorway,library,yard,in case,now that,even if,as if,in case,now that,even if,as if,anything,everything,nothing,something,anything,everything,nothing,something
6 【题文】依次填入下列句子横线处的词语，最恰当的一项是（） ①从海南省电影公司获悉，一福建省东山县委书记谷文昌为的故事片《公仆》，在我省放映至今已有10100人次、近160家单位组织了观看。 ②屈原披头散发，形容枯槁，神情悲怆，他于汨罗江畔，放不下故国热土和自己永远挚爱的人民。 ③在中国人的传统观念中，人们总是把伸张正义的希望那些有侠肝义胆的英雄身上，因此像鲁智深这样的人才会受到人们的敬仰。 A．原形留连寄予 B．原型留连寄于 C．原形.留恋寄予 D．原型留恋寄于
7 【题文】已知关于的方程在区间上有实数根，则实数的取值范围是
8 When we read books we seem to enter a new world. This new world can be similar to the one we are living in, or it can be very 1. Some stories are told 2they were true. Real people who live in a normal world do real things; in other words, the stories are about people just like us doing what we do. Other stories, such as the Harry Potter books, are not 3. They are characters and creatures that are very different from us and do things that would be 4 for us. But there is more to books and writing than this. If we think about it, even realistic writing is only 5. How can we tell the difference between what is real and what is not real? For example, when we read about Harry Potter, we do seem to learn something about the real world. And when Harry studies magic at Hogwarts, he also learns more about his real life than 6. Reading, like writing, is an action. It is a way of 7. When we read or write something, we do much more than simply look at words on a page. We use our 8--- which is real --- and our imagination ---which is real in a different way --- to make the words 9in our minds. Both realism and fantasy use the imagination and the “magic” of reading and writing to make us think. When we read 10realistic, we have to imagine that the people we are reading about are just like us, even though we know that we are real and they are not. It sounds 11, but it works. When we read, we fill in missing information and 12about the causes and effects of what a character does. We help the writer by pretending that what we read is like real life. In a way, we are writing the book, too. Most of us probably don’t think about what is going on in our 13when we are reading. We 14a book and lose ourselves in a good story, eager to find out what will happen next. Knowing how we feel 15we read can help us become better readers, and it will help us discover more about the real magic of books. possible,easy,new,different,possible,easy,new,different,that,what,whether,as if,that,what,whether,as if,realistic,reasonable,moral,instructive,realistic,reasonable,moral,instructive,difficult,impossible,important,necessary,difficult,impossible,important,necessary,thinkable,designed,imagined,planned,thinkable,designed,imagined,planned,lessons,dreams,experience,magic,lessons,dreams,experience,magic,working,thinking,understanding,living,working,thinking,understanding,living,knowledge,skill,words,grammar,knowledge,skill,words,grammar,come to life,come to light,come to the point,come to nothing,come to life,come to light,come to the point,come to nothing,a newspaper,something,everything,a story,a newspaper,something,everything,a story,dangerous,serious,strange,terrible,dangerous,serious,strange,terrible,talk,learn,read,think,talk,learn,read,think,mind,life,world,society,mind,life,world,society,turn up,pick up,cook up,bring up,turn up,pick up,cook up,bring up,what,how,when,why,what,how,when,why
9 17世纪西方人认为：“（中国）这一制度提供了这样一种保障，即政府以个人的才能为基础，而非欧洲那样——为世袭权力所支配，故该制度不失为一种民主和平等的制度。”该制度应是 A.郡县制 B.察举制 C.九品中正制 D.科举制
10 材料1：广东省对外贸易发展情况（单位:亿美元）内容出口进口年份数额增幅数额增幅 2006年 3019.5 26.8％ 2252.6 18.7％ 2007年 3692.46 22.2％ 2648.03 17.5％注：从贸易方式看，2007年广东省一般贸易出口增长31.2％，加工贸易出口增长18.1％。材料2：从2005年7月汇率改革以来，美元与人民币的比价从初期的1：8.11变化至 2008年4月1日的l：7.02，人民币升值幅度达13．4％。材料3：近年来，某些国家抵制中国制造的产品，除个别产品确实存在质量问题外，更重要的原因在于这些国家推行贸易保护主义，对“中国制造”怀有抵触情绪。材料4：自2007年7月1日起，国家取消553项“高能耗、高污染、资源性”商品的出口退税，对2268项容易引起贸易摩擦的商品降低出口退税率，导致珠三角一些缺乏自主创新能力的传统加工贸易企业的转移或者关闭。根据上述材料，运用《经济生活》知识回答： (1)材料l反映了什么经济现象?结合以上材料分析其产生的原因。 (2)人民币升值对珠三角的传统加工贸易企业带来哪些影响? (3)如果你被聘为珠三角传统加工贸易企业的管理顾问，请根据以上材料为企业发展提出几条建议。

【题文】质量为m的钢球自高处落下，以速率v 1碰地，竖直向上弹回，碰撞时间极短，离开地的速率为v 2．在碰撞过程中，钢球受到合力的冲量的方向和大小为（ ） A．向下，m（v1

可能感兴趣的题目：

【题文】质量为m的钢球自高处落下，以速率v ₁碰地，竖直向上弹回，碰撞时间极短，离开地的速率为v ₂．在碰撞过程中，钢球受到合力的冲量的方向和大小为（）

A．向下，m（v₁