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如图，用橡皮筋将一小球悬挂在小车的架子上，系绕处于平衡状态。现使小车从静止开始向左加速，加速度从零开始逐渐增大到某一值，然后保持此值，小球稳定地偏离竖直方向某一角度（橡皮筋在弹性限度内）。与稳定在竖直...
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探究功与物体速度变化的关系的实验如图甲所示当小车在一条橡皮筋作用下弹出时橡皮筋对小车做的功记为W..
某学习小组做探究合力的功和物体速度变化关系的实验如图图中小车是在一条橡皮筋作用下弹出沿木板滑行这时橡
12分1某研究性学习小组做探究橡皮筋做的功和物体速度变化的关系的实验装置如图所示图中是小车在一条橡皮
如图所示用两根完全相同的橡皮筋MN将两个质量均为m=1kg的可视为质点的小球AB拴接在一起并悬挂在
B拴接在一起，并悬挂在水平天花板上，在小球A上施加一水平向左的恒力F，当系统处于静止状态时，橡皮筋M与竖直方向的夹角为60°．假设两橡皮筋的劲度系数均为k=5N/cm，且始终处在弹性限度以内，重力加速度g=10m/s
2．则（ ）
A．橡皮筋M的伸长量为4cm
橡皮筋N的伸长量为3cm
水平恒力的大小为10
N
如果水平恒力撤去，则小球B的瞬时加速度为零
如图将钩码悬挂在橡皮筋的中点C橡皮筋的两端连接AB两小环AB并拢靠在一起穿于水平杆上．将AB逐渐分开
保持不变
逐渐变长
逐渐变短
先逐渐变短，后逐渐变长
探究功与物体速度变化的关系的实验如图所示当静止的小车在一条橡皮筋作用下弹出时橡皮筋对小车做的功记为W
如图所示在用橡皮筋拉动小车的装置来探究做功与物体速度变化的关系的实验中保持小车的质量一定将长滑板稍微
如图所示用橡皮筋将一小球悬挂在小车的架子上系统处于平衡状态现使小车从静止开始向左加速加速度从零开始
一定降低
一定升高
保持不变
升高或降低由橡皮筋的劲度系数决定
如图用橡皮筋将一小球悬挂在小车的架子上系统处于平衡状态现使小车从静止开始向左加速加速度从零开始逐渐增
一定升高
一定降低
保持不变
升高或降低由橡皮筋的劲度系数决定
探究功与物体速度变化的关系的实验如图甲所示当小车在一条橡皮筋作用下弹出时橡皮筋对小车做的功记为W.当
探究功与速度变化的关系的实验装置如图甲所示.当小车在一条橡皮筋作用下弹出时橡皮筋对小车做的功记为.当
如图所示在探究功与物体速度变化的关系的实验中1下列说法正确的是A.为减小实验误差长木板应水平放置B.
某学习小组做探究合力的功和物体速度变化关系的实验如图图中小车是在一条橡皮筋作用下弹出沿木板滑行这时橡
如图用橡皮筋将一小球悬挂在小车的架子上系统处于平衡状态现使小车从静止开始向左加速加速度从零开始逐渐增
一定升高
一定降低
保持不变
升高或降低由橡皮筋的劲度系数决定
探究功与物体速度变化的关系的实验如图所示当静止的小车在一条橡皮筋作用下弹出时橡皮筋对小车做的功记为W
如图甲所示的实验装置可用于探究力对静止物体做功与物体获得速度的关系1实验中小车会受到摩擦阻力的作用可
探究功与物体速度变化的关系的实验如图甲所示当小车在一条橡皮筋作用下弹出时橡皮筋对小车做的功记为W..
如图所示用橡皮筋将一小球悬挂在小车的架子上系统处于平衡状态现使小车从静止开始向左加速加速度从零开始逐
一定降低
一定升高
保持不变
升高或降低由橡皮筋的劲度系数决定
如图用橡皮筋将一小球悬挂在小车的架子上系统处于平衡状态现使小车从静止开始向左加速加速度从零开始逐渐增
一定升高
一定降低
保持不变
升高或降低由橡皮筋的劲度系数决定
某学习小组做探究合力的功和物体速度变化关系的实验如图图中小车是在一条橡皮筋作用下弹出沿木板滑行这时橡
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E Womenarefriendly.ButmenaremorecompetitiveWhyResearchershavefoundit’salldowntothehormoneoxytocin荷尔蒙催生素.Althoughknownasthelovehormoneitaffectsthesexesdifferently. Womentendtobesocialintheirbehavior.TheyoftensharewithothersButmentendtobecompetitiveTheyaretryingtoimprovetheirsocialstatussaidProfessorRyan. Generallypeoplebelievethatthehormoneexytocinisletoutinourbodyinvarioussocialsituationsandourbodycreatesalargeamountofitduringpositivesocialinteraction互动suchasfallinginloveorgivingbirth. ButinapreviousexperimentProfessorRyanfoundthatthehormoneisalsoletoutinourbodyduringnegativesocialinteractionssuchasenvy. Furtherresearchesshowedthatinmenthehormoneoxytocinimprovestheabilitytorecognizecompetitiverelationshipsbutinwomenitraisestheabilitytorecognizefriendship. ProfessorRyan’srecentexperimentused62menandwomenaged20to37. Halfoftheparticipants参与者receivedoxytocin.Theotherhalfreceivedplacebo安慰剂. Afteraweekthetwogroupsswitchedwithparticipants.Theywentthroughthesameprocedurewiththeothermaterial. Followingeachtreatmenttheywereshownsomevideopictureswithdifferentsocialinteractions.Thentheywereaskedtoanalyzetherelationshipsbyansweringsomequestions.Thequestionswereabouttellingfriendshipfromcompetition.Andtheiranswersshouldbebasedongesturesbodylanguageandfacialexpressions. Theresultsindicatedthataftertreatmentwithoxytocinmen’sabilitytocorrectlyrecognizecompetitiverelationshipsimprovedbutinwomenitwastheabilitytocorrectlyrecognizefriendshipthatgotbetter. ProfessorRyanthusconcluded:Ourexperimentprovesthatthehormoneoxytocincanraisepeople’sabilitiestobetterdistinguishdifferentsocialinteractions.Andthebehaviordifferencesbetweenmenandwomenarecausedbybiologicalfactor因素thataremainlyhormonal. Theauthordevelopsthetextby_______.
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下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
阅读下面短文并用英语回答问题请注意题后的词数要求 Whenmyfatherwascelebratingamilestone里程碑birthdayIpulledtogetherasurprisegifttreathewouldneverforget. Ashewasapproaching60Ihadafunidea:WhatifIcouldgetthememoriespeoplehadofhimputeachoneintoanenvelope—60intotal—andhavehimopenthemonebyoneonhisbirthdaySoIwroteane-mailtofamilyandfriendsexplainingmyidea. Isentthee-mailandwaited.AndthentherepliesstartedcominginandIwasveryverysurprised.Thereweresomanymemoriesandtheywereallsolovely.Theycamefromthe’50s’60s’70sfromeverydecade十年betweennowandthedaymydadwasborn.Theycamefrommymothermysiblingsmygrandmamydad’sfriendsfromhighschoolhissistermydad’sfirstbossacolleagueathisfirstjobfrompeoplewhohadn’tseenmydadin40yearsfrompeopleImyselfhadn’teveninformed.Theytypedthemandhandwrotethem.Theymailedthemande-mailedthem. ThenightbeforeDad’sbirthdaymysisterandIstayeduplateputtingeverythingtogetherwithsomeenvelopes. Thenextmorningafterbreakfastandpresentsandcakewegavethepileofenvelopestohim.Justonemorethingforyouwesaid. Ittookhimalongtimetoopenthemandread.Eachonewasabrieftickettoanothertimealeap跳跃backwardoveryearsanddecades.Therewasalotoflaughterandafewtearstoo. Iwaskindofsadwhentheprojectwasoverbecauseitwasgreatfuntocollectthesememories.Itgavemeadifferentpictureofdad. Howdidtheauthor’sfathermostprobablyfeelwhenhereadthemailsnomorethan3words
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改革开放后随着我国社会经济的发展人口迁移日趋频繁完成1～2题 图1为2012年我国部分省级行政区户籍人口和常住人口数量统计图该图可以反映人口迁移情况图中①②③④对应的省级行政区最可能是
下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
E Womenarefriendly.ButmenaremorecompetitiveWhyResearchershavefoundit’salldowntothehormoneoxytocin荷尔蒙催生素.Althoughknownasthelovehormoneitaffectsthesexesdifferently. Womentendtobesocialintheirbehavior.TheyoftensharewithothersButmentendtobecompetitiveTheyaretryingtoimprovetheirsocialstatussaidProfessorRyan. Generallypeoplebelievethatthehormoneexytocinisletoutinourbodyinvarioussocialsituationsandourbodycreatesalargeamountofitduringpositivesocialinteraction互动suchasfallinginloveorgivingbirth. ButinapreviousexperimentProfessorRyanfoundthatthehormoneisalsoletoutinourbodyduringnegativesocialinteractionssuchasenvy. Furtherresearchesshowedthatinmenthehormoneoxytocinimprovestheabilitytorecognizecompetitiverelationshipsbutinwomenitraisestheabilitytorecognizefriendship. ProfessorRyan’srecentexperimentused62menandwomenaged20to37. Halfoftheparticipants参与者receivedoxytocin.Theotherhalfreceivedplacebo安慰剂. Afteraweekthetwogroupsswitchedwithparticipants.Theywentthroughthesameprocedurewiththeothermaterial. Followingeachtreatmenttheywereshownsomevideopictureswithdifferentsocialinteractions.Thentheywereaskedtoanalyzetherelationshipsbyansweringsomequestions.Thequestionswereabouttellingfriendshipfromcompetition.Andtheiranswersshouldbebasedongesturesbodylanguageandfacialexpressions. Theresultsindicatedthataftertreatmentwithoxytocinmen’sabilitytocorrectlyrecognizecompetitiverelationshipsimprovedbutinwomenitwastheabilitytocorrectlyrecognizefriendshipthatgotbetter. ProfessorRyanthusconcluded:Ourexperimentprovesthatthehormoneoxytocincanraisepeople’sabilitiestobetterdistinguishdifferentsocialinteractions.Andthebehaviordifferencesbetweenmenandwomenarecausedbybiologicalfactor因素thataremainlyhormonal. WhatcanwelearnfromProfessorRyan’spreviousexperiment
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假设你是李夏你的美国笔友Sam来信关心你参加高考的情况请根据以下要点回信告知 1.考试日期与科目 2.考试准备情况 3.考试时的状态 4.对试题的感受 5.可能的考试结果 注意 1.词数120左右 2.开头语和结尾语已为你写好 3.可以适当增加细节以使行文连贯 4.文中不能出现考生真实姓名和学校名称 参考词汇高考collegeentranceexamination DearSam Thankyouforyourconcern.___________ Bestwishes!
图3为我国某区域冬季某日8时至次日8时的降雪量和积雪深度分布图该时段该区域风向主要为偏东风云量分布差异不明显完成5～7题 道路积雪会影响交通应用GPS技术可以
阅读下面短文并用英语回答问题请注意题后的词数要求 Whenmyfatherwascelebratingamilestone里程碑birthdayIpulledtogetherasurprisegifttreathewouldneverforget. Ashewasapproaching60Ihadafunidea:WhatifIcouldgetthememoriespeoplehadofhimputeachoneintoanenvelope—60intotal—andhavehimopenthemonebyoneonhisbirthdaySoIwroteane-mailtofamilyandfriendsexplainingmyidea. Isentthee-mailandwaited.AndthentherepliesstartedcominginandIwasveryverysurprised.Thereweresomanymemoriesandtheywereallsolovely.Theycamefromthe’50s’60s’70sfromeverydecade十年betweennowandthedaymydadwasborn.Theycamefrommymothermysiblingsmygrandmamydad’sfriendsfromhighschoolhissistermydad’sfirstbossacolleagueathisfirstjobfrompeoplewhohadn’tseenmydadin40yearsfrompeopleImyselfhadn’teveninformed.Theytypedthemandhandwrotethem.Theymailedthemande-mailedthem. ThenightbeforeDad’sbirthdaymysisterandIstayeduplateputtingeverythingtogetherwithsomeenvelopes. Thenextmorningafterbreakfastandpresentsandcakewegavethepileofenvelopestohim.Justonemorethingforyouwesaid. Ittookhimalongtimetoopenthemandread.Eachonewasabrieftickettoanothertimealeap跳跃backwardoveryearsanddecades.Therewasalotoflaughterandafewtearstoo. Iwaskindofsadwhentheprojectwasoverbecauseitwasgreatfuntocollectthesememories.Itgavemeadifferentpictureofdad. Whosentthemailsnomorethan6words
下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
图3为我国某区域冬季某日8时至次日8时的降雪量和积雪深度分布图该时段该区域风向主要为偏东风云量分布差异不明显完成5～7题 造成该区域东西部积雪深度差异的主要因素是
图2为某个组团式城市布局图各城区分散布局完成3～4题 该城市的布局模式有利于
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