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为验证机械能守恒定律，某同学做了如下实验：将一小球用细绳悬挂于O点，在O点正下方安装与光电计时器相连的光电门．将小球拉至细线水平由静止释放，小球向下摆动后通过光电门，光电门记录下了小球通过光电门的时...
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高三下学期物理《》真题及答案
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某同学利用如图所示的实验装置验证机械能守恒定律.1请指出该同学在实验操作中存在的两处明显错误或不当①
以下是一些有关实验的描述其中正确的是A.在用单摆测定重力加速度的实验中应该用悬线长加上小球的直径作为
以下四个中学学生实验中都要用到小球或者重锤实验中需要测定小球或重锤质量的是_________选填下面
机械能守恒定律
在验证机械能守恒定律时如果以υ2/2为纵轴以h为横轴根据实验数据绘出的υ2/2-h图线应是图线的斜率
在验证机械能守恒定律的实验中1为进行验证机械能守恒定律的实验有下列器材可供选用铁架台打点计时器复写纸
以下四个实验中都要用到小球或重锤实验中必须测定小球或重锤质量的是___________选填下面正确选
用如图7所示的实验装置验证机械能守恒定律.实验所用的电源为学生电源输出电压为6V的交流电和直流电两种
用落体法验证机械能守恒定律下面哪些测量工具是必需的.A.天平B.弹簧秤C.刻度尺D.秒表
以下四个中学学生实验中都要用到小球或者重锤实验中必需测定小球或重锤质量的是选填下面正确选项前的代号字
某同学采用如图所示的实验装置做验证机械能守恒定律的实验时请指出这个实验过程中产生误差的主要原因找出两
某课外活动小组利用竖直上抛运动验证机械能守恒定律1某同学用20分度的游标卡尺测量一小球的直径示数如图
在验证机械能守恒定律的实验中需要测量的是重物的A.质量B.下落高度C.下落时间D.瞬时速度
用如图所示的实验装置验证机械能守恒定律.实验所用电源为学生电源输出电压为6V的交流电和直流电两种.重
①验证动量守恒定律②验证机械能守恒定律③用单摆测定重力加速度A.要用打点计时器的实验是B.要用天平的
在下列四个学生分组实验中都要用到小球或垂锺其中不需要测定小球或重锤质量的实验是填字母代号A.验证机械
在验证机械能守恒定律的实验中某同学依据纸带求得相关各点的瞬时速度以及与此相对应的下落距离h以v2为纵
热力学第一定律的实质是
质量守恒定律
机械能守恒定律
能量转换和守恒定律
卡诺定理
在利用重锤做自由落体运动验证机械能守恒定律的实验中挑选纸带的原则是①②.
某同学在做验证机械能守恒定律的实验时有如下步骤A.把打点计时器固定在铁架台上并用导线将打点计时器接在
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在算盘上每一个上珠表示每一个下珠表示以空档表示0以档表示数位．
﹣﹣Jeffcouldyoutellmeifittomorrow.IfittomorrowIwillstayathome. ﹣﹣It'sreportedthatitwillbesunnylet'sgocampingontheFenghuangmountain. A.rain;rain B.rains;rains C.willrain;rains D.willrain;willrain
学校运来10吨煤烧了8天后还剩4吨平均每天烧煤多少吨
﹣﹣HelloLucypleasegivemesomeonhowtoimprovemyEnglish! ﹣﹣You'dbetterkeep___moreEnglishbooks. A.advices;read B.advice;read C.advice;reading D.advices;reading
OnApril23.2019aseriesofeventstocelebrate the1anniversaryoftheChinesePeople'sLiberationArmyPLANay中国人民海军washeldinQingdao. Destroyers驱逐舰sailedintheseasubmarines潜艇slidunderthesurfaceandfighterjetsflewacrossthesky.Itwasn'tascenefromawarmovieindeeditwasarealgrandnavalparade. Asalargecountry2morethan18000kilometersofcoastlineChinaneedsastrongnavy.Thiswasahardlesson3byhistory.AccordingtoXinhuafromthe1850suntil1949.foreignforcesusedtheseatomakeabout470invasionsofChina.ThereforethePLANavyhasbecomeakeylineofthenation'sdefense. AsPresidentXiJinpingsaidtheoceansareofgreatsignificanceastheysustainlifeandconnecttheworld.Theblueplanetthathumansinhabitisnotdividedintoislandsbytheoceans.4isconnectedbytheoceanstoformacommunitywithasharedfuturewherepeopleofallcountriessharewealandwoesaidXiduringhis5attheevent. 1A.seventy B.seventieth C.seventith D.seventeen 2A.has B.have C.with D.of 3A.teach B.taught C.learn D.learned 4A.But B.and C.or D.with 5A.speak B.talk C.chat D.speech
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﹣﹣Dr.BethunehelpedalotofChineseinthe1930sheisagreatinternationalsoldier. ﹣﹣Iknow.sohestillinbothChinaandCanadanow. A.has;remembered B.is;remembered C.well;remember D.is;remembering
甲仓原来存粮是乙仓的后来甲仓增加存粮88吨这时乙仓与甲仓存粮吨数的比是67乙仓有存粮多少吨
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AmajorfiredestroyedNotre﹣Dame巴黎圣母院builtinthe12and13centuriesinPanisonApril52019.改为被动语态 Notre﹣Damebuiltinthe12and13centuriesinParisbyamajorfireonApri152019.
习__说:我们都在努力奔跑我们都是追梦人. Weareveryhardwearealldreamchasers.PresidentXiJinpingsaid.
按如图用小棒摆正六边形摆第4个六边形需要根小棒摆第51个正六边形需要根小棒．
已知A＝B＝则A÷B＝．
知识来源于质疑.朋友今天你提问题了吗? Knowledgecomes.Mydearfriendsdoyouaskanyquestionstoday?
小冬爸爸5月份的工资总收入约是8000元按照如图进行支配那么用于教育费用约是
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等腰三角形的一个底角是30度它的顶角是度．
学校食堂运进一堆煤堆放成一个近似的圆锥．它的底面直径是6米高是1.3米．如果每立方米煤重1.8吨这堆煤重．
解比例 1.250.25＝x1.6 ＝x ＝
A:ExcusemedoyouknowwheretheDazhouMuseumis? B:Sure1 A:Couldyoutellmehowtogothere? B:Certainly.Goalongthisstreetandtumrightatthethirdturning.ThenwalkuntilyouseethebuildingofDazhouTVstation2 A:Ohyoumeanit'sacrossfromthebuildingofDazhouTVstation? B:Exactly. A:3 B:Twokilometers. A:4 B:No.You'dbettertakeataxi.It'sfastandconvenient. A:Great!Ohandonemorething.Whattimedoesthemuseumclose? B:5You'dbetteraskforthedetailedinformationinthemuseum. A:Thankyouverymuch. B:You'rewelcome. 12345
我将永远记得这三年以来总是严格要求我的老师们. Iwillremembertheteachersforeverwhohavealwaysbeenmefor3years.
把4m长的绳子平均分成7段每段是这根绳子的每段长m．
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