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河南省濮阳市2023-2024学年第二学期八年级期末考试试卷试题(数学)试卷答案
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(Text10)W:Dearstudents,welcometoyournewuniversity,aplacetohelpyourealizeyourdream.First,I'dliketointroducetheprofessors.Youwillhaveexcellentteacherswhoarefamousathomeandabroad.Theyarebothknowledgeableandresponsible.Second,therearevariousafter-schoolactivitiesforyou,suchassinging,dancinganddrawing,amongwhichsingingisthemostpopularone.Youcanparticipateinanyactivityyoulikebutyouhavetofollowtherules.AndnowI'llintroducethecampus.Thetallestbuildingistheteachingbuilding,whereyouwillhaveclassesandlearnhowtobearesponsibleadult.Onitsrightisthelibrary,whereyoucanreadbooksfromallovertheworld.InthelibraryyoucanhaveWi-FiaccesstotheInternet.Nexttothelibraryisthelabbuilding,whereyoucangainabetterunderstandingofhowscienceworks.That'sallIwanttosaytoday.Thankyouforyourat-tentionandenjoyyournewschoollifehere.案【23新教材·DY·英语·参考答案一R一必修第二册一N】
(15分)如图所示,光滑水平面上放着相同的木板B和C,质量均为2m,B、C间距为L。质量为m、可视为质点的物块A以初速度v0冲上木板B,A与B、C间的动摩擦因数相同,当A运动至B的最右端时,A、B速度相同且B、C恰好相撞,撞后B、C粘在一起。求:(1)木板B的长度;(2)物块A是否能够冲出C的右端;(3)整个过程系统因摩擦产生的热量。
