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某物理兴趣小组的同学在研究弹簧弹力的时候,测得弹力的大小F和弹簧长度l的关系如图1所示,则由图线可知: (1)弹簧的劲度系数为 N/m. (2)为了用弹簧测定两木块A和B间的动摩擦因数μ,...
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【内蒙古鄂尔多斯市一中2017届高三上学期第四次月考】5分某物理兴趣小组的同学在研究弹簧弹力的时候测
一个实验小组在探究弹力和弹簧伸长的关系的实验中使用两条不同的轻质弹簧a和b得到弹力F.与弹簧长度l的
a的原长比b的长
a的劲度系数比b的大
a的劲度系数比b的小
测得的弹力与弹簧的长度成正比
某物理兴趣小组的同学在研究弹簧弹力的时候测得弹力的大小F和弹簧长度l的关系如1图所示则由图线可知1弹
关于胡克定律下列说法中正确的是
由F.=kx可知,弹力F.的大小与弹簧的长度x成正比
由k=
可知,劲度系数k与弹力F.成正比,与弹簧长度的改变量x成反比
弹簧的劲度系数k是由弹簧本身的性质决定的,与弹力F.的大小和弹簧形变量x的大小无关
弹簧的劲度系数在数值上等于弹簧伸长(或缩短)单位长度时弹力的大小
下面是与胡克定律有关的几个结论①由胡克定律F=kx可知弹簧的劲度系数k=k与弹力F成正比与形变量x成
①③
①②
③④
②④
探究弹力和弹簧伸长的关系一个研究学习小组设计了竖直悬挂在铁架台上的弹簧的实验装置实验中所使用的钩码每
某物理兴趣小组的同学在研究弹簧弹力的时候测得弹力的大小F.和弹簧长度l的关系如图1所示则由图线可知1
关于胡克定律下列说法不正确的是
由k=F./x可知,劲度系数k与弹力F.成正比,与弹簧的长度改变量成反比
由F.=kx可知,在弹性限度内弹力F.的大小与弹簧形变量x成正比
弹簧的劲度系数k是由本身的性质决定的,与弹力F.的大小和形变量x的大小无关
弹簧的劲度系数在数值上等于弹簧伸长(或缩短)单位长度时弹力的大小
为了探求弹簧弹力F.和弹簧伸长量x的关系某同学选了
、
两根规格不同的弹簧进行测试,根据测得的数据绘出如图所示的图象,从图象上看,下列说法正确的是 A.A.弹簧的劲度系数大于B.弹簧的劲度系数 B.A.弹簧的劲度系数小于B.弹簧的劲度系数
当弹簧弹力为3N时,A.弹簧的伸长量是3cm
当弹簧弹力为3N时,B.弹簧的伸长量是3cm
关于胡克定律下列说法正确的是
由F=kx可知,在弹性限度内弹力F的大小与弹簧形变量x成正比
由k=可知,劲度系数k与弹力F成正比,与弹簧的长度改变量成反比
弹簧的劲度系数k是由弹簧本身的性质决定的,与弹力F的大小和弹簧形变量x的大小无关
弹簧的劲度系数在数值上等于弹簧伸长(或缩短)单位长度时弹力的大小
在探究弹簧弹力与弹簧伸长量关系的实验中某同学将一轻质弹簧竖直悬挂已知弹簧原长为0.10m.当弹簧下
一个实验小组在探究弹力和弹簧伸长的关系的实验中使用两条不同的轻质弹簧a和b得到弹力与弹簧长度的图象如
a的原长比b的短
a的劲度系数比b的大
a的劲度系数比b的小
在弹性限度内,测得的弹力与弹簧的形变量成正比
某兴趣小组的同学在研究弹簧弹力的时候测得弹力的大小F和弹簧长度L关系如图所示试由图线确定 1弹簧
某同学在探究弹力与弹簧伸长的关系的实验中得到一轻质弹簧的长度L和弹力F大小的关系如图所示此弹簧的劲度
一个实验小组在探究弹力和弹簧伸长的关系的实验中使用两条不同的轻质弹簧a和b得到弹力与弹簧长度的图象如
a的原长比b的长
a的劲度系数比b的大
a的劲度系数比b的小
测得的弹力与弹簧的长度成正比
某物理兴趣小组的同学在研究弹簧弹力的时候测得弹力的大小F和弹簧长度l的关系如图1所示则由图线可知
某学校兴趣小组的同学在研究弹簧弹力的候测得弹力的大小F和弹簧长度L关系如图所示试由图线确定 1弹
2018年·宁夏三校联考三模某物理兴趣小组的同学在研究弹簧弹力的时候测得弹力的大小F和弹簧长度l的关
一个实验小组在探究弹力和弹簧伸长量的关系实验中得到的弹力与弹簧长度的图像如图所示1下列表述正确的是A
关于胡克定律下列说法不正确的是
由F.=kx可知,在弹性限度内弹力F.的大小与弹簧的弹性形变量x成正比
由k=F./x可知,劲度系数k与弹力F.成正比,与弹簧的形变量成反比
弹簧的劲度系数k是有弹簧本事的性质决定的,与弹力F.的大小和弹簧形变量无关
弹簧的劲度系数在数值上等于弹簧伸长(或缩短)单位长度是弹力的大小
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设NA为阿伏加德罗常数的值下列说法正确的是
配制500mL0.50moI/L的NaOH溶液时下列实验操作对配制的溶液浓度无影响的是
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﹣﹣﹣What'thetimeoftheflight? ﹣﹣﹣Itwilltakeoffat300o'clock. A.return B.direct C.departure D.change
﹣﹣﹣Hello.CouldIspeaktoHarryplease? ﹣﹣﹣. A.Whoareyou B.Ihavenotime C.CanItakeamessage D.Speaking
某工业废水仅含下表中的某些离子且各种离子的物质的量浓度相等均为0.1mol/L此数值忽略水的电离及离子的水解. 甲同学欲探究废水的组成进行了如下实验 Ⅰ.该工业废水呈无色取该无色溶液5mL滴加氨水有白色沉淀生成继续滴加氨水沉淀不溶解. Ⅱ.用铂丝蘸取溶液在火焰上灼烧透过蓝色钴玻璃观察无紫色火焰. Ⅲ另取溶液加入过量盐酸没有沉淀生成但有无色气体生成该无色气体遇空气全部变成红棕色. Ⅳ.向Ⅲ中所得的溶液中加入BaCl2溶液有白色沉淀生成.请推断 1由ⅠⅡ判断溶液中一定不含有的阳离子是 2Ⅲ中加入盐酸生成无色气体的离子方程式是 3甲同学最终确定原溶液中所含阳离子有阴离子有又用PH计测量原溶液酸碱性发现溶液呈填“酸性”“碱性”或“中性”原因是.请用离子方程式说明 4另取200mL原溶液加入足量的NaOH溶液充分反应后过滤洗涤灼烧沉淀至恒重最终得到的固体质量为g
常温下下列各组离子在指定溶液中一定能大量共存的是
氮化铝AIN广泛应用于电子陶瓷等工业领域.在一定条件下AIN可通过下列反应高温Al2O3+N2+3C2AlN+3CO合成.下列叙述正确的是
﹣Here'syourchange. ﹣﹣ A.Thankyou. B.Don'tmentionit. C.Noproblem D.Withpleasure.
﹣﹣﹣What'swrongwithyou? ﹣﹣﹣. A.I'vegotafever B.Iwearalonghair C.Ihavebeenacook D.Ilovemysister
WhenTVnewsprogramsreportwarsordisasterstheeditorsrarelyusethemosthorrifyingpicturesofdeadorwoundedvictimsbecausetheydon'twanttoupsettheirviewers.Evensoviewersareusuallywarnedinadvancethattheymayfindsomeofthesedisturbingsotheycanlookawayiftheychoose.Butthemenandwomenwhosejobsaretorecordthosescenes﹣﹣theTVcameramen﹣havenosuchchoice.Itistheirdutytowitnessthehorrorsofthewarandrecordthemnomatterhowhorrifyingandunpleasanttheymaybe.Consequentlyitisoneofthemostdangerousexposedandemotionallytaxingjobthattheworldoffers. Todaythedemandfortheirworkisrising.Theexplosionofsatellitebroadcastingand24hournewsinrecentyearshavecreatedanalmostinsatiable无法满足的demandforTVinformation.ButmajorbroadcastersandtheTVnewsagencies﹣﹣suchasReutersandWTN﹣﹣﹣haveneverhadenoughstafftomeettheworldwidedemandforup﹣to﹣datepicturessoincreasinglytheyturntoFreelanceTVcameramen. Thesefreelancecameramenareindependentoperatorstiedtonoparticularorganization.Theywillworkforanycompanywhichhiresthemforjustafewhoursorforseveralweeksinawarzone.ButifafreelancecameramanisinjuredinthecourseofthejobtheTVcompanyisnotresponsibleforhim.Thefreelancermustsurviveonhisown. TVwillalwaysneedhardvividmovingpictureswhicharefreshbutthesecompaniesfeeluncomfortablewithlargenumbersofemployeesontheirbooksexplainsNikGrowingonceforeigneditorforBritain'sChannel4NewsandnowaBBCnewspresenter. Byhiringfreelancerstheycanbuyintheskillstheyneedonlywhentheyneedthem.Italsoenablesthemtocontractouttheriskhesays. 32.TheunderlinedwordtaxinginPara1mostprobablymeans. A.demandingB.strikingC.satisfyingD.encouraging 33.TVnewsagenciesturntofreelancecamerameninorderto. A.saveexpensesandavoidrisk B.getfirsthandinformationandpictures C.lookforpicturesthatareoffinequalities D.buythehorrifyingpicturestheyneed 34.Fromthepassagewecanknowthat. A.TVcameramenshouldbegivenbetterchoiceofwork B.TVcameramenarebeingchallengedbythefreelancers C.TVcameramenhavetowitnessdisastersandkillingwhethertheylikethemornot D.TVcameramenhavetocontractouttherisksfortheircompanies 35.Theauthorofthepassageshowshisthefreelancecameramen. A.respectforB.sympathytoC.ignoranceofD.admirationto.
﹣﹣﹣Hello.I'mcallingaboutthecomputerprogrammerpositioninyourcompany.? ﹣﹣﹣Yesitis. ﹣﹣﹣I'dliketoapplyforthejob. A.Haveaseat B.Isitstillopen C.what'sthesalary D.Doyouhaveanyexperience
设NA为阿伏加德罗常数的值下列说法正确的是
﹣﹣﹣isittoday? ﹣﹣﹣It'sSunday. A.Whatdate B.Whatday C.Whattime D.Whatyear
下列有说法正确的是
下列说法正确的是
﹣﹣﹣Excuseme.isitalltogether? ﹣﹣﹣Usuallyit's120yuanbuttodayit'sonlyhalfprice.
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