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一轻杆一端固定质量为m的小球,以另一端O为圆心,使小球在竖直面内做半径为R的圆周运动,如图所示,则下列说法正确的是( )
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如图所示一根轻杆质量不计的一端以O.点为固定转轴另一端固定一个小球小球以O.点为圆心在竖直平面内沿顺
沿F.
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的方向
沿F.
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沿F.
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沿F.
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一轻杆一端固定一质量为m的小球以另一端O.为圆心使小球在竖直平面内做半径为R.的圆周运动以下说法正确
小球过最高点时,杆所受的弹力可以为零
小球过最高点时最小速度为
小球过最高点时,杆对球的作用力方向可以与球所受重力方向相反。
小球过最高点时,杆对球的作用力一定与小球所受重力方向相同。
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直面内做半径为R.的圆周运动如图所示则下列说
小球过最高点时,杆所受到的弹力可以等于零
小球过最高点的最小速度是
小球过最高点时,杆对球的作用力一定随速度增大而增大
小球过最高点时,杆对球的作用力一定随速度增大而减小
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直平面内作半径为R.的圆周运动如图所示则.
)小球过最高点时,杆所受弹力可以为零 (
)小球过最高点时的最小速度是
(
)小球过最高点时,杆对球的作用力可以与球所受重力方向相反,此时重力一定大于杆对球的作用力 (
)小球过最高点时,杆对球的作用力一定跟小球所受重力的方向相反
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直面内做半径为R.的圆周运动如图所示则下列说
小球过最高点时,杆所受到的弹力可以等于零
小球过最高点的最小速度是
小球过最高点时,杆对球的作用力不一定随速度增大而增大
小球过最高点时,杆对球的作用力一定随速度增大而减小
如图所示一长为6L的轻杆一端连着质量为m的小球另一端固定在铰链O.处轻杆可绕铰链自由转动.一根不可伸
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直平面内做半径为R.的圆周运动如图所示则.
小球过最高点时,杆所受弹力不可能大于重力
小球过最高点时的最小速度是
小球过最低点时,杆对球的作用力一定跟小球所受重力的方向相反
小球过最高点时,杆对球的作用力一定跟小球所受重力的方向相反
一轻杆一端固定质量为m的小球以另一端为圆心使小球在竖直平面内作半径为R.的圆周运动如图所示则
小球过最高点时,杆所受弹力可以为零
小球过最高点时的最小速度是
小球过最高点时,杆对球的作用力可以与球所受重力方向相反
小球过最低点时,杆对球的作用力可能小于重力
一端可绕光滑轴转动的轻杆另一端固定一个小球A中点固定一个小球B两球的质量均为m杆长为L现使轩与竖直方
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直平面内作半径为R.的圆周运动如图所示则
小球过最低点时,球对杆的力不一定大于球的重力
小球过最高点时的最小速度是
小球过最高点时,杆对球的作用力一定跟小球所受重力的方向相反
小球过最高点时,杆对球的作用力可以与球所受重力方向相反,此时重力一定大于杆对球的作用力
一轻质细绳长为l一端固定于O.点另一端拴着质量为m的小球小球绕O.点在竖直面内做圆周运动如图所示求小
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直面内做半径为R.的圆周运动如图所示则下列说
小球过最高点时,杆所受到的弹力可以等于零
小球过最高点的最小速度是零
小球过最高点时,杆对球的作用力一定随速度增大而增大
小球过最高点时,杆对球的作用力一定随速度增大而减小
一根长L.的轻杆一端固定杆的中点和另一端装有质量分别为4m和m的小球.当杆从水平位置静止释放下落到竖
一轻杆一端固定一质量为m的小球以另一端O为圆心使小球在竖直平面内做半径为R的圆周运动以下说法正确的是
小球过最高点时,杆所受的弹力可以为零
小球过最高点时最小速度为
小球过最高点时,杆对球的作用力可以与球所受重力方向相反,此时重力一定等于杆对球的作用力的两倍
小球过最高点时,杆对球的作用力一定与小球所受重力方向相反
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直平面内作半径为R.的圆周运动如图所示则.p
)小球过最高点时,杆所受弹力可以为零(
)小球过最高点时的最小速度是
(
)小球过最高点时,杆对球的作用力可以与球所受重力方向相反,此时重力一定大于杆对球的作用力(
)小球过最高点时,杆对球的作用力一定跟小球所受重力的方向相反
长为l的轻杆一端安在光滑固定转动轴O.上另一端固定有一只质量为m的小球视为质点给小球一个初速度使它在
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直平面内作半径为R.的圆周运动如图所示则
小球过最低点时,球对杆的力不一定大于球的重力
小球过最高点时的最小速度是
小球过最高点时,杆对球的作用力一定跟小球所受重力的方向相反
小球过最高点时,杆对球的作用力可以与球所受重力方向相反,此时重力一定大于杆对球的作用力
如图所示一长为6L.的轻杆一端连着质量为m的小球另一端固定在铰链O.处轻杆可绕铰链自由转动一根不可伸
质量为0.2kg的小球固定在长为0.9m的轻杆一端杆可绕过另一端O.点的水平轴在竖直平面内转动g取1
一轻杆一端固定质量为m的小球以另一端O.为圆心使小球在竖直面内做半径为R.的圆周运动如图所示则下列说
小球过最高点时,杆所受到的弹力可以等于零
小球过最高点的最小速度是
小球过最高点时,杆对球的作用力一定随速度增大而增大
小球过最高点时,杆对球的作用力一定随速度增大而减小
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Runningisagreatwaytogetinshapeandjustabouteveryonecandoit.Giventhatit'ssoeasytotakeupthesportalotofbeginnersjumprightintorunningwithoutactuallyknowingwhatittakestoestablishahealthyroutine.1.Ifyouarejuststartingoutavoidthefollowingthingstohelpyouincreaseyourchancesofrunningsuccess. Doingtoomuchtoosoon Oneofthebiggestmistakesbeginnersmakeisdoingtoomuchtoosoon.Pickingupanewhobbylikerunningisnodoubtexciting.Runnersneedtoeaseintothesportbeforeincreasingthedistance.2. 3 Beginnersmightthinktheyneedtorunnearlyeverydaytomeettheirfitnessorweight﹣lossgoalsbutthiscouldn'tbefurtherfromthetruth.4especiallyforbeginnerswhosemusclesandboneshaven'tyetbeenconditionedforsuchintense剧烈的exercise.Soit'simportanttogiveyourbodyamplerestbetweenworkouts.Followatrainingplanthatincludesrestdays. Comparingyourselftoothers 5You'reexcitedaboutrunningsoyouareprobablyreadingrunningblogsmagazinesandmessageboardswhereyoumightstarttofeelinadequateaboutyourownrunningpace.Insteadofgettingdownonyourselfrememberthateveryrunnerwasonceabeginnerandusetheirsuccessasmotivation! A.Nottakingrestdays B.Notrunningeveryday C.Asmentionedahealthyroutineiswhattheyattachimportanceto D.Runningisademandingactivitywhichcanbereallyhardonyourbody E.Whenstartingoutwithrunningit'stoughnottocompareyourselftoothers F.Itwillhelpreducetheriskofinjurysoyoucancontinuewithyournewrunningroutine G.Manymakeanumberofcommonmistakeswhichcaninterfere干扰withtrainingorleadtoinjury
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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.每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. 删除把多余的词用斜线\划掉. 修改在错的词下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. IlikeEnglishmostbecauseEnglishissopopularthesedays.AsfarI'mconcernedEnglishisaimportantinternationallanguage.IfIspeakEnglishwellIwillbeabletocommunicatewithpeopleallovertheworld. NowadaysEnglishiswideusedinnewsbusinesscommunicationandtourisms.AstheworldisbecomingaglobalvillageourcountrywillneedmorepeoplewhomaregoodatEnglish.MasterEnglishcanhelpmefindmorejobopportunities.What'smoresomeEnglish﹣spokencountrieslikeAustraliaNewZealandandCanadaareverymuchbeautiful.Iwantedtotraveltothesecountriesverymuch.SoImustlearnEnglishgood.
已知某产品连续4个月的广告费用xii=1234千元与销售额yii=1234万元经过对这些数据的处理得到如下数据信息 ①广告费用x和销售额y之间具有较强的线性相关关系 ② ③回归直线方程=x+中的=0.8用最小二乘法求得 那么广告费用为8千元时可预测销售额约为
某校从6名学生干部其中女生4人男生2人中选3人参加学校的汇演活动在女生甲被选中的情况下则男生乙也被选中的概率为
ThereisasmallbutgrowingmovementinAmericaofmany1familythatwanttoreducewastetozero.2theygoalofproducingnotrashisprobablyimpossibletoreach.Somecomeclosereducingayear'sworthoftrashtoonlyafewthings3canfitintoasmallcontainer.Allotherthingstheysaycanberecycledorcomposted. ZeroWastersastheyarecalledhelpeachotherbysharingadviceonblogsandsocialmedia.Alotofpeoplehavegiven4valueadviceonthesubjectrecently.Someoftheadviceincludeswheretobuythings5avoidunwantedpackagingandhowtorecyclethingsthatmostpeoplethrowaway. BeaJohnsonahousewifesaysthatreducingshoppingmeansherfamilyhasmoremoneyforfunvacations6everbefore.Shewhois7satisfywiththefactsaysalltheirclothingcomesfromusedclothingstores.Shesaysthathasreducedherhouseholdspending840percent. ZeroWastersadvocate9talkaboutfiver'sthatdescribewanttheydoRefuseReduceReuseRecycleandRot.Theyrequestthatthingslikeremainingfoodnot10throwawayrandomlyandrefusecontainersatrestaurants.
Chinawasalatecomertospaceexplorationandinthemoviesithasbeenalatecomertosciencefictiontoo.Thatisabouttochange.Thecountry'sfirstblockbuster大片setinspaceTheWanderingEarthopensTuesdaywithgreatexpectationsthatitwillrepresentthedawningofanewageinChinesefilmmaking.ThefilmalsoopenswiththeLunarNewYearthebeginningofanofficialweeklongholidaythatistraditionallyapeakbox﹣officeperiodinChina.IthasalimitedshowintheUnitedStatesCanadaAustraliaandNewZealand TheWanderingEarthshownin3﹣DtakesplaceinadistantfutureinwhichthesunisabouttoexpandintoaredgiantanddestroytheEarth.Theapproachingdangerforcestheworld'sengineerstomakeaplantomovetheplanettoanewsolarsystemusinggiantthrusters推进器.ThingsgoverybadlywhentheEarthhastopasstheJupitersettingoffdesperatedisturbancetosavehumanityfromruin. ThefilmcomesasChinareachedamilestoneinspacethelandingofaprobe探测器onthefarsideofthemooninJanuary.AlthoughdecadesbehindRussiaandtheUnitedStatesChinahasnowputastronautsinorbitandhasambitiousplanstojoin﹣orevenlead﹣anewageofspaceexploration. IthinkthereisaverycloseconnectionbetweenChinesecinemaandthenation'sfortunessaidShaDanaleaderattheChinaFilmArchiveWhenwehavetheabilitytorescueourpeopleabroadwecanmakemovieslikeOperationRedSea.OnlywhenChinacanenterthespaceagecanwemakeworkslikeTheWanderingEarth. TheWanderingEarthtakesforgrantedChina'scentralroleinfuturespaceexplorationbutitalsohasavisionoftheinternationalteamworknecessarytodealwiththethreatsfacingtheplanetathemethatrunsdeeplythroughthefilm. 1WhatdoestheauthorthinkofTheWanderingEarth? A.Itisahitintheoverseafilmmarkets. B.Itisasuccessinscience﹣fictionfilms. C.ItisthebeginningofChinesefilmmaking. D.ItisonlyapresentfortheLunarNewYear. 2WhatcausestheEarthtowanderinspace? A.Anewsolarsystem. B.AnewplanetliketheEarth. C.Theexpandingsuninadistantfuture. D.AdeadlydiseaseforpeopleontheEarth. 3WhatmainlypromotesChinesefilmmakingaccordingtothetext? A.China'sincreasingoverallnationalstrength. B.Chinesefilmmakers'growingbudgets. C.ThegrowingconfidenceofChinesedirectors. D.Theincreasinglyexperiencedfilmtechnology. 4WhatisreflectedthroughoutTheWanderingEarth? A.Theimportanceofheroes. B.Thethreatsfromexplorations. C.Thenation'spowerofChina. D.Theinternationalcooperation.
在九章算术方田章圆田术刘徽注中指出“割之弥细所失弥少.割之又割以至不能割则与圆周合体而无所失矣.”注述中所用的割圆术是一种无限与有限的转化过程比如在中”…”即代表无限次重复但原式却是个定值x这可以通过方程确定出来x=2类似地可得的值为
已知函数fx=ex﹣2x﹣a在[﹣11]恰有两个零点则实数a的取值范围是
某商家对一种新产品进行试销得到如下数据 绘制散点图得知与具有线性相关关系.若该产品每件成本9元要使该产品销售总利润最大则单价约为元.销售总利润=单价﹣成本×销售量 附注1参考公式回归方程y=bx+a中斜率和截距的最小二乘估计分别为 2参考数据xi﹣yi﹣=﹣56.
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