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1、1UNITS,PHYSICALQUANTITIESANDVECTORS1.1.IDENTIFY:Convertunitsfrommitokmandfromkmtoft.SETUP:1in.=.254cm,1km1000m,=12in.=1ft,1mi=5280ft.??5280ft??12in..??254cm??1m??1kmEXECUTE:(a)100mi.=(100mi).??????????=161km.??1mi??1ft??1in.??10cm23??10m??10m32??10cm??1in.?1ft?(b)100km.=(1
2、00km).????????=32810ft.×3????1km????1m??254cm..?12in?EVALUATE:Amileisagreaterdistancethanakilometer.Thereare5280ftinamilebutonly3280ftinakm.1.2.I3DENTIFY:ConvertvolumeunitsfromLtoin..S3ETUP:1L1000cm.=1in.=.254cm??3??.31000cm1in3EXECUTE:0473L.×??×??=289in...????1L??254cm.E3
3、33VALUATE:1in.isgreaterthan1cm,sothevolumeinin.isasmallernumberthanthevolumeincm,3whichis473cm.31.3.IDENTIFY:Weknowthespeedoflightinm/s.tdv=/.Convert1.00fttomandtfromstons.S89ETUP:Thespeedoflightisv=.×30010m/s.1ft=.03048m.1s=10ns.03048m.29EXECUTE:t==10210.×s102ns=.30010m/s
4、.×8E855VALUATE:In1.00slighttravels30010m.×=.×30010km18610mi.=.×1.4.I33DENTIFY:Converttheunitsfromgtokgandfromcmtom.SETUP:1kg1000g.=1m1000cm.=3g??1kg??100cm4kgEXECUTE:193.×??×??=19310.×cm33??1000g??1mmE33VALUATE:Theratiothatconvertscmtomiscubed,becauseweneedtoconvertcmtom.1
5、.5.I3DENTIFY:Convertvolumeunitsfromin.toL.S3ETUP:1L1000cm.=1in.=.254cm.E333XECUTE:(327in)(254cm/in).×..×=.(1L/1000cm)536LE3333VALUATE:Thevolumeis5360cm.1cmislessthan1in,.sothevolumeincmisalargernumberthanthevolumeinin..31.6.I22DENTIFY:Convertfttomandthentohectares.S42ETUP:
6、100hectare10010m..=.×1ft=.03048m.?Copyright2012PearsonEducation,Inc.Allrightsreserved.Thismaterialisprotectedunderallcopyrightlawsastheycurrentlyexist.Noportionofthismaterialmaybereproduced,inanyformorbyanymeans,withoutpermissioninwritingfromthepublisher.1-11-2Chapter122??
7、43600ft,??03048m..?100hectare?EXECUTE:Theareais(120acres).=??????486hectares..????1acre??100ft.?10010m.×42?1ft22=.(03048)m.2EVALUATE:Since1ft=.03048m,1.7.IDENTIFY:Convertsecondstoyears.9SETUP:1billionseconds110s.=×1day=24h.1h=3600s.9??1h??1day??1yEXECUTE:100billionseconds.
8、=(10010s).×????=317y..??????3600s24h??365daysE1y=.315610s×7assumes1y=.36524d,whichistheav
