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A、B、C、D四个质量均为0.5kg的物体,在光滑的水平面上做直线运动,它们运动的v﹣t、x﹣t、a﹣t、F﹣t图象如图所示,已知物体在t=0时的速度均为零,则其中0﹣4s内物体运动位移最大的是( ...
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静止在光滑水平面上的物体质量为25kg在与水平面成60°角斜向上的力F.=10N作用下运动10s则在
在光滑的水平面上质量为3.0kg速度为2.0m/s的物体与质量为2.0kg的静止物体发生对心碰撞则碰
如图物体在斜向上恒力F作用下沿水平面作直线运动下列判断正确的是
若水平面粗糙,物体一定受四个力作用
若水平面光滑,物体一定受二个力作用
若物体做匀加速直线运动,则可能受四个力作用
若物体做匀速直线运动,则一定受四个力作用
光滑水平面上的一个物体质量为2kg处于静止状态当它受到一个水平恒力作用后在头2.0s内移动了4.0m
在光滑的水平面上有一个质量为20kg的物体处于静止状态用30N的水平力拉着物体运动当物体的速度达到3
一个质量为1kg的物体静止在光滑水平面上受到水平拉力作用该拉力随时间变化的关系如图所示那么在4s内该
如图5所示用力F.拉着三个物体在光滑的水平面上一起运动现在中间物体上加上一个小物体在原拉力F.不变的
T
a
增大
T
a
减小
T
b
增大
T
b
减小
如图所示在光滑水平面上放置
B.两物体,其中
物体带有不计质量的弹簧静止在水平面内。A.物体质量为m,以速度v
0
逼近B.,并压缩弹簧,在压缩的过程中( ) A.任意时刻系统的总动量均为mv
0
B.任意时刻系统的总动量均为mv
0
/2
任意一段时间内两物体所受冲量的大小相等,方向相反
当A.B.两物体距离最近时,其速度相等
如图所示大小相同的力F.作用在同一个物体上物体分别沿光滑水平面粗糙水平面光滑斜面竖直方向运动一段相等
拉力F.对物体做的功
物体的动能增量
物体加速度的大小
物体运动的时间
.一个质量是10kg的物体沿水平面做匀速直线运动物体受到的摩擦力是20N.物体受到的拉力是_____
如图所示
B两物体靠在一起静止放在粗糙水平面上,质量分别为mA=1kg,mB=4kg,A.B与水平面间的滑动摩擦因数均为0.6(最大静摩擦约等于滑动摩擦力),g取10m/S2,若用水平力FA=6N推A物体。 则下列有关说法正确的是( )
A.A对B的水平推力为6N
B物体受4个力作用
A物体受到水平面向左的摩擦力,大小为6N
若FA变为40N,则A对B的推力为32N
有关做功的下列几个说法中正确的是
某人用50N的力将物体推动2m,则人对物体做功一定为100J
某人用50N的水平力将物体在光滑水平面上静止开始推动2m,则人对物体做功为100J
某人用50N的水平力将物体在粗糙水平面上推动2m,则人对物体做功一定大于100J
某人用50N的水平力将质量分别为50kg和100kg的两物体沿水平面推动2m,则人对物体做功分别为100J和200J
在下列四种情况中推力做功最多的是
用10N的水平推力把质量为
的物体在光滑水平面上推着前进
用5N的水平推力把质量为
的物体在光滑水平面上推着前进2
用10N的水平推力把质量为
的物体在粗糙水平面上推着前进
用5N的水平推力把质量为
的物体在光滑水平面上推着前进
质量为m=2kg的物体受到F.=4N.的水平恒力作用先在光滑水平面上由静止开始运动经4s后进入动摩擦
如图所示光滑水平面上有一个质量m=7.0kg的物体在F.=14N的水平力作用下由静止开始沿水平面做匀
2017年·龙岩一模ABCD四个质量均为2kg的物体在光滑的水平面上做直线运动它们运动的x﹣tv﹣
@B.
D四个质量均为2kg的物体,在光滑的水平面上做直线运动,它们运动的x﹣t.v﹣t.a﹣t.F﹣t图象如图所示,已知物体在t=0时的速度均为零,其中0~4s内物体运动位移最大的是( )
A.
B.
C.
一质量为1kg的物体静止在光滑水平面上现在给它施加一个水平向右的3N恒力作用求物体在第3秒内的位移
如图1所示在光滑的水平面上用弹簧相连的质量均为2kg的A.B两物体以6m/s的速度向右运动弹簧处于原
一物体置于光滑的水平面上在10N.水平拉力作用下从静止出发经2秒速度增加到10m/s则此物体的质量为
在光滑水平面上.质量为2kg的物体以2m/s的速度向东运动当对它施加一向西的力使它停下来则该外力对物
16J
-8J.
-4J
0
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1分YouwerecompletelymaboutJohn.Hejustlookedlikethethiefwhoranaway.
法国学者贝特朗发现在研究事件A“在半径为1的圆内随机地取一条弦其长度超过圆内接等边三角形的边长”的概率的过程中基于对“随机地取一条弦”的含义的不同理解事件A的概率PA存在不同的容案该问题被称为贝特朗悖论现给出种解释若固定弦的一个端点另个端点在圆周上随机选取则PA=
6分Cheatingisnothingnew.Butit'sbecomingalotmoresophisticated.Republicanvice﹣presidentialcandidateSarahPalinwascaughtoutonce.Aphototakenafterthespeechshe'dgivenonareturntoconservativeprinciplesshowedherlefthandcoveredwithcribnotes.TheseincludedthewordsenergybudgetcutstaxandliftAmericans'spirits.Thewordbudgethadbeencrossedout.Videofootagealsoshowedherreadingfromherhandwhenaskedwhattopthreethingsaconservative﹣ledcongressshoulddo.Writingnotesonyourhandisonewaytocheatinanexam.Butthesedaysit'saloteasier…especiallywiththeInternet. Anyonewhowantstocheatinanexamcanprobablyfindtheanswersonline.Therearehundredsofsitesofferingsolutionstoallsortsoftests.Andit'salucrativebusiness.OneoperatorinOregonmade﹩700000inaboutninemonthsbeforehisarrest.TheownerofawebsiteinOhiopocketedmorethan﹩300000.Andafamousoverseassiteisestimatedtosellabout146000setsofanswersandtakeinabout﹩10millionperyear.Actuallygettingholdoftheexamanswersisn'tthathard.Somedotheexamthemselvesandusebuttoncamerasordocument﹣scanningpenstocopythetests.Othersorganizeforagrouptotaketestsrepeatedlyuntiltheycanmemorizetheentireexambetweenthem.Otherssimplybribeexamadministrators. Atthemomentsuchbusinessisbooming.Moreandmorecompaniesnowrequiretheiremployeestotakeprofessionalexams.Andhundredsofbusinessesandtradeorganizationshaveintroducedformalcertificationprogramstomeasureemployeeskills.IntheUSaloneatleast2millionexamsaretakeneveryyearforinformationtechnologycertification.Butemployeesalsohavetotakeexamsforallsortsofprofessionsfromcraneoperatorstocourtreporterstoschoolbusdriversandfinancialplanners.Testofficialsestimatethathundredsofthousandsoftest﹣takershaveusedtheInternettobuyanswersforprofessionaltests.Andarecentsurveyfoundthat28percentoftestcentreshadatleastonecheatingincidentoverthelastfiveyears.Inoneincidenttensofthousandsofsoldiersobtainedanswerstotestsinarangeofmilitaryskills. Manyseethisasacauseforconcern.Manytestsareforworkinsensitiveareassuchasdefenceinstallationsandhospitals.Nowhowwouldyoufeelifyouknewthatthepeopleinchargeofthecomputerscontrollingnuclearweaponsmighthavecheatedintheirtestsandmaynotreallyknowwhatthey'redoing? 1WhydoestheauthormentionSarahPalininthefirstparagraph? A.Toshowmuchdisagreementastocheatingamongpoliticalleaders. B.Todiscourageaveragepeoplefromwritingnotesontheirhands. C.Toexhibitthefactthatcheatingiscommoninvariousfields. D.Tointroducethenegativeinfluencesofcheatinginfrontofthepublic. 2TheunderlinedwordlucrativeinParagraph2isclosestinmeaningto. A.profitable B.stable C.ripe D.fresh 3Whatisthemaincauseofmorecasesofcheating? A.Theformationofemployeeskills. B.Therequirementoftakingprofessionalexams. C.Thepopularityofthecheatingindustry. D.Theavailabilityofinformationtechnology.
6分ParentsinSpainarebeingurgedtogoonaweekendhomeworkstrikethismonthinprotestagainsttheunacceptableamountofafter﹣schooltaskstheirchildrenaregiven.ThehomeworkloadofSpanishchildrenhaslongbeenasorepointwithsomeparentswhoarguethattheburdenistoogreatplacestoomuchpressureonpupilsandeatsintofamilytime. AccordingtoastudybytheOrganizationforEconomicCo﹣operationandDevelopmentOECDSpanish15﹣year﹣oldshave6.5hoursofhomeworkaWeekcomparedwithanaverageof4.9acrossthe38OECDcountries.TheSpanishConfederationofAssociationsofMothersandFathersofStudentsCeapaiscallingonparentswhosechildrenattendSpanishstateschoolstoboycottweekendhomeworkinNovember. We'velostabitofcommonsenseinthiscountrywhenitcomestotalkingabouteducationandwe'vegotasysteminwhichboys'andgirls'freetimehasdisappearedsaidJosLuisPazospresidentofCeapa.Schoolsarepassingontaskstofamiliesthattheyshouldn'tbe.Itstartswithchildrenfromtheagesofthreetosixdoinghalfanhour'shomeworkeveryday.Forusthat'sanunacceptablesituation. PazossaidCeapadisagreedwiththebeliefthatchildrenshouldendurehugeamountsofhomeworkinthehopethatitwouldensurethemabetterfuture.Theyshouldbe.happywhenthey'relittleandthatlifeisn'tjustaboutsomeonetellingyouthatyouhavetosufferinexplicably难以理解地.Themodelneedstochangebecausesocietyhaschanged. Schoolchildrenhavetofittheirhomeworkaroundtheschooldaywhichvariesfromregiontoregionandschooltoschoolbutstartsearlyfromaround8amor9amandfinishesanywherebetween2pmand5pm.Howeverschoolsareincreasinglyusingan8am﹣2pmtimetabletosavemoneyandinthefaceofevidencethatsuggeststhelongerhoursdonotyieldbetterresults. AspokesmanfortheeducationdepartmentofMadridsaidhomeworkwasamatterforindividualschoolsratherthanregionalgovernments.They'retheoneswhoknowbestwhattheneedisineachcase. 1WhyareparentsinSpainbeingcalledontogoonastrike? A.Tostopschoolviolence. B.Toaskforlongerschooltime. C.Tosaynotoheavyhomeworkload. D.Torequestequaleducationfortheirkids. 2WhichofthefollowingwouldCeapaagreeto? A.Longerschoolhourswillensurebettergrades. B.Happinessisthemostimportantthingforachild. C.Hugeamountsofhomeworkmeansabetterfuture. D.The8am﹣2pmtimetableissuitableformostchildren. 3Whichofthefollowingshouldberesponsibleforstudents'homeworkaccordingtothespokesman? A.Ceapa. B.TheOECD. C.Regionalgovernments. D.Eachindividualschool.
8分I'maspeedreader.HavebeensinceIwasateen.Motherworkedforthecontinuingeducationdepartmentofauniversityandtheywereofferingaclassonspeedreadingandneededonemorepersontofillouttheclass.Ibecamethatoneperson. Theclassmetforonlyanhourortwoforafewweeksbutwhenthegoalofaclassisspeedyoudon'tneedtomeetforlong.Theinstructorsaidtomakeoureyesgoacrossthelinesofwordsasfastastheycouldandnottobeconcernedaboutwhatthewordsmeant.IreadAnimalFarmin10tenminutes.Covertocover.Theinstructoraskedwhatthebookwasabout.IsaidIdidn'tknowbutifIhadtoguessI'dsayitwasaboutanimalsonafarm.Helookeddispleased. I'vebeenspeedreadingeversince.Ican'tstopandIcan'tslowdown.TodayforexampleIplanonreadingChurchill'sHistoryoftheEnglishSpeakingPeoplesoverlunch.Ihopeit'smorememorablethanAnimalFarm. Asaresultofallthisspeed﹣readingIoftenexperienceadelaybetweenwhatIthinkIreadandwhatsomethingactuallysays. TheotherdayIpassedbyamallwithalargesignthatsaidAutoTheftSale.Ithoughthowefficientitwasforautothievestosimplysellallthestolecarsinabigtentatthemall.Ahalf﹣milelateritdawnedonmethatthesignhadsaidAutoTentSale. EverytimeIdrivethroughaconstructionzoneIgasp屏气.ThesignsaysHitaWorker﹩10000about62000yuan.Itreadslikethey'reofferingareward.Ofcourseit'snotanoffer.It'sjustthatmyeyesrarelytakeinthelastlinethatsaysFine.It'sa﹩10000fineifyouhitaworker.Someonereallyneedstorephrasethatone. Speedreadinghasbittenmeonthebacksidemorethanonce.Especiallyasawriter.Justaskanyofmyeditors. 1Whywastheauthorabletoattendclassesonspeedreading? A.Shetookachanceandfilledonevacancy空缺. B.Shewastheonlyteenagerapplicantfortheclass. C.She'dalreadypracticedspeedreadingbefore. D.Hermotherfoundhergiftedinspeedreading. 2Whatlefttheinstructorunsatisfiedintheclass? A.IttooktheauthortenminutestocompleteAnimalFarm. B.Theclasswasonlyanhourortwoforafewweeks. C.Theauthorreadfastbutdidn'tgetthemainideaofthebook. D.Alltheclassactuallyfailedtofollowhisadvice. 3Theauthortendstoprovethatthereisalwaysadelayinherunderstandingafterspeedreadingby. A.makingcomparisons B.analyzingcauseandeffect C.drawingaconclusion D.givingexamples 4Whichofthefollowingbestdescribestheauthor? A.Talentedandproductive. B.Truthfulandhumorous. C.Carelessandquick﹣tempered. D.Proudandhot﹣headed.
1分Yourmkitchenreallyneedstobecleanedthoroughly.
平行四边形ABCD中M是BC的中点若则λ+μ=
2分ThenthatDollyhadbecomeseriouslyill.CloningscientiststofindthatDolly'sillnessweremoreappropriatetoamucholderanimal.
10分ToreachonelocalrestaurantabowlofChinesenoodlestravelsacrosstheEurasiancontinentandsettlesontheScandinavianPeninsula1placebeforehungrypeoplevisitingthehomeofSantaClaus. AChinesemanbroughtlocaldishesreganmianandhotpottoRovaniemiFinlandbecomingthefirstChinese2openanrestaurantintheArcticCircle. HuLiangfromCentralChina'sHubeiprovincemigratedtoFinlandaftergraduationat21.Fortwelveyearhe3seemoreandmoreChinesetouristsvisitingthecountrytoenjoythewinterholidayAuroraBorealis北极光﹣andofcoursethepurported传说的homeofSantaClaus. Chinesepeoplearebecoming4richandmoreinternational.5hasnotchangedistheir6stomach.SoImade7decisiontoopentherestaurant. Hu'srestaurantservesreganmianatraditionalWuhannoodledishwithspicyflavorandasesamepaste芝麻酱dressingaswellasChinesehotpot.HeordersfoodmaterialsfromChinesetradecorporationsthroughe﹣commenceplatformsand8e﹣paymentpopularamongChinesepeoplesuchasAlipay. 9apriceof15euro$18.45abowlofreganmianisnotonlygreatcomfortforChinesetouristswhohavetraveledfromthousandsofmiles10butalsoanattractiontolocalFinns.
1分Whynotkeepadictionaryathandforc?Youcanlookupintothedictionarywheneveryoumeetnewwords.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号^并在其下面写出该加的词. 删除把多余的词用\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. YoucanfindallkindsinformationinjustafewminuteontheInternet.It'slikegoingtoahugelibrarywithouthavingtowalkaroundtofindyourbooks.RecentlymanypeoplehadbeendiscussingthedangersoftheInternet.TheyhavebeenreportsinAmericaaboutpeopletryingtostealpersoninformationforbadpurposes.FindinformationOntheNetiseasy.Sonotallinformationisgoodtooursociety.Foranexampleyoucanfindsoinformationashowtokillpeople.Theproblemwillbecomelessseriousinthefuture.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号/\并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下面划一横线并在该词下面写出修改后的词. 注意1.每处错误及修改均限一词2.只允许修改10处多者从11处起不计分. Iwillshareoneexperiencewithyou.WiththecollegeEntranceExaminationdrawnearIwasfilledwithgreatanxiety.HoweverIcouldn'tbeabsorbedinstudyresultingfrommyfailingintheexamination.Igotverydiscouraging.JustthenmyteacherMissZhangapproachedtomeandsaidInlifeweallhavemomentswhenwecan'tachievewhatwewant.Itisnatural.Don'tallowthosemomentstoweakenyouandturnthemintomotivationtoinspireyourself. Herwordswerereminderthatprovidedmewithconstantencouragementtosmileatlife.ConsequentlyIgainedthatIdeserved. Soitisanoptimisticattitudewhichmattersmostofall.Itgivesyoutheconfidencetodealwithdifficultiesandtoachievewhatyouwantinyourlife.
“微信运动”是腾讯开发的一个记录跑步或行走情况步数里程的公众号用户通过该公众号可查看自己某时间段的运动情况.某人根据2018年1月至2018年11月期间每月离步的里程单位十公里的数据绘制了下面的折线图.根据该折线图下列结论正确的是
30分IwaslivinginSaoPauloBrazil.Itisa1citywithmorepeoplelivinginitthaninmywholecountry.Werentedaflatinaguardedcommunitybuttherewasafavela贫民窟quite2. ForseveralmonthsIdidn'thaveacar3threetimesaweekItookbusestogotothecitycentre.Duringthese4Iwouldridewiththepeoplewhotookthesamebusfromthefavelatogotowork.WhenIgotonthebusalltheseatswerealready5.Butwhenpeoplesawthatmybagwas6theyofferedtoholditontheirlegstomakemefeellighter7.AtfirstIwas8.ThenIrealizedthatthesepeoplehadabsolutelyno9tostealfrommetheyonlywantedto10. OnceonmywaybackIhadto11alongtimeatabusstop.Iwas12exceptforawomanwhowas13verypoor.Shecarriedasmallpaperbagofpopcornandnothingelse. Whilewewerewaitingshewalkedoverand14mesomepopcorn.I15herbutdidn'twanttohelpmyselftoit.Shethenrepeatedly16thatItakefromwhatwasclearlyher17food. ThatwasthefirsttimeIhadthoughtabouthowpeoplewhohavealmostnothingaresometimesableto18thelittletheyhavemore19thanthosewhoownalot.Iwonderifit'struethatthemoreyouhavethebiggertheburdenandthedifficultytoshareanythingwithothers.Iwassomovedbythatwoman'ssimple20thatday.Iclearlyhadmorethanshedidbutshenaturallyandjoyfullysharedwhatlittleshehadwithme. 1A.small B.beautiful C.warm D.huge 2A.similar B.near C.quiet D.noisy 3A.so B.because C.but D.or 4A.visits B.weekends C.holidays D.trips 5A.checked B.reserved C.emptied D.taken 6A.light B.big C.heavy D.worn 7A.standing B.sitting C.walking D.carrying 8A.doubtful B.disappointed C.appreciated D.satisfied 9A.patience B.intention C.chance D.approach 10A.greet B.meet C.help D.change 11A.lookfor B.askfor C.sitfor D.waitfor 12A.nervous B.hungry C.alone D.scared 13A.really B.obviously C.probably D.especially 14A.offered B.bought C.sold D.made 15A.refused B.thanked C.doubted D.promised 16A.argued B.ordered C.pretended D.insisted 17A.delicious B.special C.only D.sweet 18A.provide B.share C.sell D.present 19A.anxiously B.commonly C.easily D.skillfully 20A.generosity B.respect C.confidence D.encouragement
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