小明观看了公园组织的驯鳄(扬子鳄)表演,联系所学的生物学知识进行了相关分来自析,下列分析不正确的是( )
A解析:扬子鳄或称作鼍,是中国特有的一种鳄鱼,是世界上体型最细小的鳄鱼品种之一.它既是古老的控祖参无载条八,又是现在生存数量非常稀少、世界上濒临灭易什环艺既航绝的爬行动物.在扬子...
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在少年宫通过天文望远镜观看月球时,科技辅导员介绍说月球表面的环形山者任顺巴具个哥(月坑)是流星撞击而形成,如下图所示。小明听后由此引发猜想:月坑的深度可能跟流星的体积、质量、速度有关。为验证自己的猜想,他设计了用小球撞击砂子的模拟实验,装置如下图。他来自找来几个不同质量、体积的小球,校并以小球下落的高度h来控制撞击速度
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求之给之参考吧ww混妒快伤各始各个第w.***.cn15×6+15x=15090+15x=15015x=160-9015x=70x=70÷15
爱思考的小明在观看冰壶比赛时,突发奇想:*如正在水平轨道上减速滑行的冰壶所受的重力突然消失的话,冰壶会( )
spanB解析:解:*如正在水平轨道上减速滑行的冰壶所受的重力突然消失,则冰壶与水平轨道之间没有压力,摩擦力变为零,所以水平方向不再受力作用,冰壶运动状态不变,将做匀速直线运动,...
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下面很自现西思多停空训孙是小明同学撰写的课本剧《大唐帝国的**风貌》的一个片段,其中有三处错误,请指出并加以改正。(6分)有位新罗商人来到唐朝都城洛阳,发现城市街道整伟清如着烈教十临看浓齐、异常繁华。商店里商品琳琅满目,他购买了一个 “唐三彩”,离开商店,他又前往观看唐玄宗亲自创作的《秦王破阵乐》,来自然后前往寺庙,拜仍东读了大唐高僧玄奘法师的《
试题答360问答案:(1)洛阳——长安;(2)唐玄宗——唐太宗;(3)《西游记》——《大唐西域记》
湖南省电视台“智勇大冲关”游乐节目中,选手需要借助悬挂在高处的绳飞越到水面的浮台上,小明和小阳观看
(1)选手摆到最低点的过程中,机械能守恒,由机械能守恒定律得:mgl(1-cosα)=12mv2,解得:v=2gl(1?cosα)=2×10×2×(1?cos53°)=4m/s;...
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湖南省电视台“智勇大冲关”游乐节目中,选手需要借助悬挂在高处的绳飞越到水面的浮台上,小明和小阳观看来自
小题发入收止1:1080N小题2:1.2m小题3:1.5m(1)机械能守恒①(2分)圆周运动:F′-mg=m②(2分)解得:F′=(3-2cos)mg="1080N"③(1分)则...
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湖南省电视台“智勇大冲关”游乐节目中,选手需要借助悬挂在高处的绳飞越到水面的浮台上,小明和小阳观看
解:(1)机械能守恒①圆周运动:F′-mg=m②解得:F′=(3-2cos)mg=1080N态负木目屋华若权提③则:人对绳的拉力F=F′=1080N(2)选手从最高点开始**落体...
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在观看全国汽车拉力赛时,小明想到了一问题,赛道崎岖,汽车速度快,如图所示,观众站在赛段哪一区观看最安全A.A区B.B区C.C区D.只要视线好,哪个区都一样
试题**:A试题解析:分析:解决本题需掌握:车具有惯低都资性,能保持原来的速度大小和方向.解答:由图可知,当车在路上行驶时,如果车失去控制,由于惯性,车将会沿原来运动的方向冲出,...
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在观看全国汽车拉力赛时,小明想到了一问然现略团让氢加认客毛小题,赛道崎岖,汽车速度快,如图所示,观众站在赛段哪一区观看最安全( )
spanA解析:解:由图可知,当车在路上行驶时,如果车失去控制,由于惯性,车将会沿原来运动的方向冲出,即会冲到图中的B缩区和C区,故人在A区是安全的.故选A.
2006年全国汽车拉力锦标赛在金山区举行,小王和小明两人结伴去观看人群都站在赛段弯道内侧A区观看,非常拥
1.运动2.单位时间内所走的路程12.273.4.4运动4.0.5变大车中的人5.减小静止6.5地面7.20自己8.摩托车摩托车9.33自的宜石编己10.350列车11.80运动...
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北京奥组委倡导奥林匹克**,传播奥运匹克知识,鼓励广大民众到现场观看精彩的比赛,小明一家当时积极响应,上网查得部分项目的****如下:这些****的中位数和众数分别是( )
项目
开幕式
篮球
足球
乒乓球
排球
跳水
体操
田径
射击
举重
羽毛球
闭幕式 **
2
试题**:在这一组数据中50是出现次数最多的,故众数是50,而将这组数据从小到大的顺序排列后,处于中间位置的数是50、50,那么由中位数的定义可知,这组数据的中位数是50.故选D...
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小明来自在观看世界杯足球赛时,看到了足球场上一些场景,他运用学过的物理知识进行分析,其中正确的是(
A、踢出去的足球在场地上越滚越慢,是因为足球受到摩擦阻力的作用,而不是没有受到力色四绝掌压底城妒稳复的作用,故A错误;B、脚踢球使球飞出去,是因为球具备惯性,并不需要力来维持,故...
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