如图所示,地面和半圆轨道面均光滑。质量M = 1kg、长L = 4m的小车放在地

题型:计算题

问题:

如图所示,地面和半圆轨道面均光滑。质量M = 1kg、长L = 4m的小车放在地面上,其右端与墙壁的距离为S=3m,小车上表面与半圆轨道最低点P的切线相平。现有一质量m = 2kg的滑块(不计大小)以v0= 6m/s的初速度滑上小车左端,带动小车向右运动。小车与墙壁碰撞时即被粘在墙壁上,已知滑块与小车表面的滑动摩擦因数μ= 0.2,g取10m/s2

(1)求小车与墙壁碰撞时的速度;

(2)要滑块能沿圆轨道运动而不脱离圆轨道,求半圆轨道的半径R的取值。

考点:动能定理碰撞
题型:计算题

下图为云南路南石林喀斯特地貌景观图,塑造路南石林的地质作用和岩石类型分别是

A.风力侵蚀岩浆岩

B.流水侵蚀沉积岩

C.冰川侵蚀变质岩

D.海浪侵蚀沉积岩

题型:计算题

刚打完疫苗的犬只,饲养管理中需要注意()。

A、不能接触其它任何犬类

B、经常去室外呼吸新鲜空气

C、经常运动

D、尽量减少外出,近期不能洗澡

题型:计算题

第二节:(共5小题,每小题2分,满分10分)

E

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。选项中有两项为多余选项。

注意:请将答案转写到答题卡上,写在本试卷上无效。

This week,We talk about the application process for American colleges and universities.This is Part Eight in our Foreign Student Series.Earlier,we explained  how to begin a search for schools by going to one of the American educational advising centers around the world.We also discussed the rules for entering in the United States.  71    

But if your goal is to come to the United States to study,then it is time to make a list of  colleges of universities that interest you.  72   Directors of foreign student admissions say students should apply to at least three schools.

Some students want to attend a small college.Others want to go to a big university.That university in Columbus.Ohio,in the Midwest,has almost fifty-two thousand students.There are students this year from around one hundred fifty countries.Ohio State provides international students with an application on its Web site.  73   Or you can print the forms and mail them with the payment.

Many colleges and universities have their applications and also their catalogs online.You should start on your applications at least two years before you want to begin studies.  74   But answering all the questions is not enough.Another important step is taking admissions tests.The SAT is the college entry test that American high school students most commonly take.  75  Colleges and universities may also require international students to take the TOEFL—the Test of English as a Foreign Language.

A.Completing a college application can take some time.

B.You can pay the application charge online with a credit card.

C.Another one is the ACT.

D.If a really big university appeals to you,then there aye ones like Ohio State.E.Be sure to choose more than one.

F.And we talked about programs that can be completed online.

G.If you have a general question for our Foreign Student Series,write to special@voanews.com.

题型:计算题

下列关于可转换债券的叙述,正确的足( )。

A.可转换债券具有债权和收益权的双重性质
B.可转换债券可将债券持有到期收回本金和利息
C.可转换债券是将债券转换成发行人优先股的证券
D.可转换债券持有者可在任一时间将债券转换成股票

题型:计算题

根据《水利工程建设监理人员资格管理办法》(中水协[2007]3号),监理工程师、监理员分为()个专业。

A.不划分

B.3

C.6

D.9

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