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1、高一必修一一百道物理题Ina10-meterplatformrace,thecenterofgravityofanathleteisinthemiddleofthelengthofthelengthofthehandtothefeet,andthefirstmovementoftheathletebeginsfromthestillnessandbeginstoturndownfromthestage・Thewholethingwasperfect,andallthejudgesshowedfullmarks・(1)howdoestheathleteputhisarmwhe
2、nhebeginstofall?(2)theathlete'sbodyisuprightwhenheisdrowning(3)doestheathletetouchthewaterfirstorthefoot?(4)howmuchtimecanheusetocompleteaerialaction?Article17.Achainfreehangsuspendedfromtheceiling,letgooffreefall,letthechaindoafterknownchainsthroughsuspensionpointunder3.2minalittleover0.5
3、s,findthelengthofthechain(g=10m/s2)18.Aspaceprobeverticallaunchfromaplanet'ssurface,assumingthatthequalityofthedetectoris1500kg,enginethrustasaconstantforce,probeintotheuniversetoacertainheight,theenginesuddenlyclosed,asshowninfigure3,saiditsspeedchangingwiththetime(1)thedetectorintheplane
4、t'ssurfacetothebiggestheight(2)calculatethegravitationalaccelerationonthesurfaceoftheplanet(assumingthereisnoaironthesurfaceoftheplanet)16.Hint:theverticalarmovertheheaddown,doafreefall,theheightofthefallof10m,waterbodyvertical,handtouchwaterfirst,maketheactionofairtimeby,h二二1.4(s)Analysis
5、:xl=x2二T=0・3ssolutionXIisequalto0.45ofni・Chainlength1=3.2-0.45二2.75(m)Accordingtotheimage,itisthemaximumheighttoreachBHisequalto1/4,64is768(m).Whentheengineisturnedoff,thedetectorismovinguptoauniformlydeceleratedmotionAndyoucanseefromthegraphthattheinitialvelocityis64m/s,whichis16s,andthef
6、inalvelocityis0m/s,二4(m/s2)G=4m/s2objectsdofreefall,gasdownfromthestartingpointwillbedividedintothreeparts,andmaketheobjectbytheratioofthethreesectionsofdisplacementtimeassyntacticsugarfor1:2:3,howmucharethethreesectionsoftheratioofthedisplacementis?Solution:Hl二0.5gT2,thefirstperiodofdispl
7、acementSI二IIIT2二(1+2)T二3T,H2=0.5g(3T)八2二9Hl,displacementofthesecondparagraphS2=H2Hl-Hl=8T3二(1+2+3)T=6T,H3(6T)2=0.5g=36hl,displacementofthethirdparagraphS3二27hlH3-H2二SI,S2,S3二1:8:27threeTheobjectisfreefallingfromthetopofthebuilding(excludingairresistance),falli
