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如图所示为一列沿x轴正方向传播的简谐横波在t=1s时的波形图,质点A振动过程中连续两次经过平衡位置所用的时间为1s,则这列波传播的速度大小为 m/s,平衡位置在x=2m处的质点B的振动方程为 ...
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如图所示实线是沿x轴传播的一列简谐横波在t=0时刻的波形图虚线是这列波在t=0.2s时刻的波形图已知
这列波的波长是14cm
这列波的周期是0.125s
这列波可能是沿x轴正方向传播的
t = 0时,x = 4cm处的质点速度沿y轴负方向
一列简谐横波在t=0时的波形图如图所示介质中x=2m处的质点P.沿y轴方向做简谐运动的表达式为y=1
周期为4.0s
传播速度为10m/s
传播方向沿x轴负向
t=1s时,质点P.的加速度沿y轴负向最大
一列沿x轴正方向传播的简谐横波在t=0时的波形如图所示已知t=0.6s时B.点第三次出现波峰.则这列
如图所示实线是沿x轴传播的一列简谐横波在t=0时刻的波形图虚线是这列波在t=0.2s时刻的波形图已知
这列波的波长是14 cm
这列波的周期是0.125 s
这列波可能是沿x轴正方向传播的
t=0时,x=4 cm处的质点速度沿y轴负方向
如图所示在x轴上传播的一列简谐横波实线表示t=0时刻的波形图虚线表示在t=0.2s时刻的波形图已知该
波长是10m
周期是0.1s
波可能沿x轴正方向传播
t=0时,x=4m处的质点速度沿y轴负方向
如图所示实线为一列沿x轴正方向传播的简谐横波在t=0时刻的波形虚线是该波在t=0.20s时刻的波形则
0.16s
0.20s
0.32s
0.40s
一列简谐横波沿x轴的正方向传播在t=0时刻的波形如图所示恰好传播到x=4m处t=0.3s时质点a第一
如图所示为一列沿x轴负方向传播的简谐横波实线为t=0时刻的波形图虚线为t=0.6s时的波形图波的周期
波的周期为2.4 s
在t=0.9 s时,P.点沿y轴正方向运动
经过0.4 s,P.点经过的路程为0.4 m
在t=0.5 s时,Q.点到达波峰位置
一列简谐横波沿x轴正方向传播周期为2st=0时刻的波形如图所示.该列波的波速是___▲__m/s质点
一列频率为2.5Hz的简谐横波沿x轴传播在t1=0时刻波形如图中实线所示在t2=0.7s时刻波形如图
如图所示是一列简谐横波在t1=0时刻的波形图已知这列波沿x轴正方向传播波速为20m/s试画出t2=0
如图所示实线为一列沿x轴正方向传播的简谐横波在t=0时刻的波形虚线是该波在t=0.20s时刻的波形则
0.16s
0.20s
0.32s
0.40s
一列频率为2.5Hz的简谐横波沿x轴传播在t1=0时刻波形如图中实线所示在t2=0.7s时刻波形如图
如图所示一列简谐横波沿x轴正方向传播实线表示t=0时刻的波形虚线表示t=0.7s时刻的波形则这列波的
波长为4m
周期可能为0.4s
频率可能为0.25Hz
传播速度可能约为5.7m/s
一列简谐横波沿x轴传播t=0时刻的波形如图甲所示此时质点P.正沿y轴负方向运动其振动图象如图乙所示则
沿x轴负方向,60 m/s
沿x轴正方向,60 m/s
沿x轴负方向,30 m/s
沿x轴正方向,30 m/s
如图6所示实线是沿x轴传播的一列简谐横波在t=0时刻的波形图虚线是这列波在t-=0.2s时刻的波形图
这列波的波长是14 cm
这列波的周期是0.15 s
这列波可能是沿x轴正方向传播的
t=0时,x=4 cm处的质点速度沿y轴正方向
如图所示实线是沿x轴传播的一列简谐横波在t=0时刻的波形图虚线是这列波在t=0.2s时刻的波形图已知
这列波的波长是14cm
这列波的周期是0.125s
这列波可能是沿x轴正方向传播的
t=0时,x=4cm处的质点速度沿y轴负方向
如图所示为一列沿x轴正方向传播的简谐横波在t=1s时的波形图已知该波的波速为v=lm/si求该简谐横
一列简谐横波沿x轴正方向传播O.为波源且t=0开始沿y轴负方向起振如图所示是t=0.2s末x=0至4
一列简谐横波沿x轴传播t=0时刻的波形如图甲所示此时质点P.正沿y轴负方向运动其振动图象如图乙所示则
沿x轴负方向,60 m/s
沿x轴正方向,60 m/s
沿x轴负方向,30 m/s
沿x轴正方向,30 m/s
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如图为某植物2n=24基因型为AaBb两对基因位于两对同源染色体上减数分裂过程中不同时期的细胞图象相关叙述正确的是
家兔中獭兔的毛纤维长度比普通兔短家兔的毛色和长度受两对等位基因控制.海狸色獭兔与青紫蓝普通兔杂交F1相互交配F2表现型及比例为灰色普通兔青紫蓝普通兔海狸色獭兔青紫蓝獭兔=9331.相关叙述错误的是
科研人员调查了白天气温与八角金盘花丛中昆虫数昆虫体温的关系结果如图.相关叙述正确的是
假如你是李华今年暑假你将去英国CliftonSchool学习一个月并将寄宿在英国学生Jack家中.写一封电子邮件向他介绍自己并询问几个问题1.住宿方式2.能否上网3.饮食方式4.到校的交通 注意:1.词数100左右可适当增加内容2.开头和结尾已给出不计入总词数 DearJack IamLiHuaahighschoolstudentfromChina.……… Yours LiHua
我国是一个严重缺水的国家大家应倍加珍惜水资源节约用水.据测试没拧紧的水龙头每秒钟会滴下2滴水每滴水约0.05毫升.小明同学在洗手后没有把水龙头拧紧当小明离开4小时后水龙头滴了多少毫升水结果用科学记数法表示
棉花栽培中适时打顶去顶芽是棉花高产栽培的关键技术之一.打顶解除了顶端优势会改变棉株的生长中心影响植株体内光合产物和矿质养分的分配但打顶后棉株叶片在花铃后期出现早衰现象.科研人员研究了打顶后涂抹NAA对长绒棉结铃和产量的影响结果如表.请回答 注N0打顶后立即将空白羊毛脂放在切口N1打顶后立即将含浓度为3×10﹣3mmol•L﹣1NAA的羊毛脂放在切口N2打顶后立即将含浓度为3×10﹣2mmol•L﹣1NAA的羊毛脂放在切口. 1顶端优势体现了生长素生理作用具有. 2处理②和③的实验结果相差不大说明.处理④棉株的单株产量较高的原因是外源适宜浓度的NAA能提高结铃数和成铃率. 3打顶后涂抹一定浓度的NAA既保证了打顶后棉株体内的合理的生长素水平有利于更多的光合产物分配到器官又可避免因不打顶使棉株具有旺盛的顶端生长优势从而使养分过多消耗在器官上. 4为探究打顶后棉叶出现早衰现象的原因科研人员在花铃后期检测了处理①②④组的棉株叶片内相关植物激素的含量变化结果如图.据图分析叶片出现早衰现象的原因是同时说明植物生命活动是多种激素的结果. 5综合研究结果对棉花生产的指导意义是.
TwoyearsagoattheBritishAcademyofFilmandTelevisionArtsteapartyinLosAngelesMillieBobbyBrownwasacharmingdarling.WhenevershemetsomeoneshewouldextendherhandandsayHi!I'mMillieBobbyBrown.Sogladtomeetyou! BestknownforstarringasElevenayounggirlwithpsychokineticabilitiesinthehitsci﹣fiTVseriesStrangerThingsBrownisaniconforhergenerationasWmagazineputit. ToplayElevenBrownhadtocutoffherlonghairandshaveherheadwhichissomethingthatwouldbequitedifficultforanyteenager.ButtheBritishactressdiditwithoutasecondthought.Thisisperhapswhatsetsherapartfromfellowchildstars.Ontheonehanditwascool.Whenyou'rebaldrainfeelslikeaheadmassage.I'dwalkintherainandpeoplewouldlookatmelikeIwascrazyshetoldWButontheotherhandpeoplestaredatmewonderingwhetherIwassick.SomewouldevenlaughatmewithoutknowingwhetherIwasorwasn'tsick. ThesepeoplecertainlyhurtBrownesfeelingsbuttheyalsotaughthersomethingaboutcompassion.IntheendbeingbaldwasthebestthingIeverdid﹣beingdifferentchangedmylife.Iwantedtoembracemybaldnessandhopefullyinspirepeopleshesaid. HerbraverywonherthehonoroftheyoungestUNICEFGoodwillAmbassadorlastmonth. It'sahugehonortobecomeUNICEF'snewestandyoungesteverGoodwillAmbassadorthe14﹣year﹣oldwhohassupportedthechildren'scharitysince2016wroteonsocialmediaplatformInstagram.IamlookingforwardtomeetingasmanychildrenandyoungpeopleasIcanhearingtheirstoriesandspeakingoutontheirbehalf. ChildrenaretheirownbestadvocatesHenriettaForeUNICEF'sexecutivedirectorsaidinanannouncement.IknowthatMilliewilluseherpassiontodefendtherightsofvulnerablechildrenandyoungpeopleeverywhere. 1FromthepassageweknowthatMillieis. A.conservative B.aggressive C.outgoing D.energetic 2WhatdidMilliedotoplaywellinStrangerThings? A.Shetiedupherlonghair. B.Shemadeherheadbald. C.Shelearnedfromotherfellowstars. D.Sheshavedherbody. 3WhichstatementisTRUEaccordingthepassage? A.Milliewasgreatlyencouragedbyothers. B.Milliedidn'tregrettedbeingshaved. C.Milliewasinspiredbyallkindsofcomments. D.Milliewasdiscouragedbymisunderstanding. 4What'sHenriettaFore'sopinionaccordingtothepassage? A.Millieissuretohelpthevulnerablechildrenaroundtheworld. B.ChildrenareMollie'sbestadvocates. C.Milliewilldoherbesttodefendagainstvulnerablechildren. D.Therearesomanyvulnerablechildrenandyoungpeopleintheworld.
把下列数据用科学记数法表示出来地球离太阳约有1亿5千万千米
下列有关科学家的研究方法技术及成果的叙述错误的是
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