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124221201020R2RFh(C)2201020ρρA.ρρB.ρ=ρC.ρρD.32010105ABCD420109ABCD5.20101320103200g300cm3=10103kgm3g=10NkgA2NBCGeneratedbyFoxitPDFCreator©FoxitSoftware(201010)ABCD8.2010A9ABCD9ABCD1020105AB2GeneratedbyFoxitPDFCreator©FoxitSoftware=32A32B11CD12201075ABCD13201012100g100mL=0.8103kg/m3200mLABCD14.201023PPFFAPPF=FBP=PFF5GeneratedbyFoxitPDFCreator©FoxitSoftware=PFFDPPF=F15201027ABCD16201010ABCD1720101ABCD18201027AB.C.D.192010C.202010124A.B.C.D.21201013AB.C.D.22201014ABCGeneratedbyFoxitPDFCreator©FoxitSoftware=FcD.FAFB=Fc2420105abcABCD1.2010278(0.023)8002.2010292010528()(1)(2)1003129(3)()(1)(2)1290(3)GeneratedbyFoxitPDFCreator©FoxitSoftware(A.B.C.D.O2CO2)A5.2010163NAA171NAN2AA11.21.8262010162010129414060__________N______kmh(g=10Nkg)6.010511.9GeneratedbyFoxitPDFCreator©FoxitSoftware=9.8N/kg0.510310008201021FF=mmρρ==9.201010ABCD10201016h=5cm1.0×10-2m2,PaN(g=10N/kg,=1.0×103kg/m3)500511201020()10cm5kg3N(7)________Pa________N(g10Nkg)1000312.201016100cm3N(g10Nkg)120101864hFGeneratedbyFoxitPDFCreator©FoxitSoftware(g10N/kg)10.810300.1614.20102660g15.(201023)2.810316.201013200910821_______“”“”“”_______“”“”“”GeneratedbyFoxitPDFCreator©FoxitSoftware()________N102020102511g50ml161.1g/cm3,1.1g/cm321.20102780.02380022.201014______________________________232010156GeneratedbyFoxitPDFCreator©FoxitSoftware()()Nm3g=10Nkg2.82.8×10-427201030OAA10cmOAFF=40N________N________kg/m3F=________N202.0103201.201018“”19NGeneratedbyFoxitPDFCreator©FoxitSoftware©FoxitSoftware”3B2.2010,2717(1)G(2)(3)F(4)G(5)(1)(2)(2)(2)(1)G(1)(2)(1)()3.201029“”1912GeneratedbyFoxitPDFCreator©FoxitSoftware(1)(b)(c)(a)()(2)()(3)(d)(e)12c,d35.201016115NKgm319GeneratedbyFoxitPDFCreator©FoxitSoftware(1)()ABCD(2)12312333()()(1)C(2)7.2010221“?”______________GeneratedbyFoxitPDFCreator©FoxitSoftware=G()GeneratedbyFoxitPDFCreator©FoxitSoftware(1)(2)(3)()123FGF=-21GGG=-10.20102712ABCVDF=32CDgV311201023)GeneratedbyFoxitPDFCreator©FoxitSoftware(1)0.2N4N(2)(3)12201030114N214mLFGgV120.220213.201025”(1)b,(c)a(b)c(d)(e)GeneratedbyFoxitPDFCreator©FoxitSoftware(/)2c)(d)(3)1.1N.14.20102413(1)________N(2)________()(3)13________N(4)()3412GF1F21.367210-3m36kg3kg(1)(2)ABCCO2(3)?g10Nkg=10103kg/m312B333331.010kg/m10N/kg7.210m72NFgVρ-==××××=72N7.2kg10N/kgFGmgg====m′=6kg+3kg-7.2kg=1.8kgGeneratedbyFoxitPDFCreator©FoxitSoftware(g=10Nkg)(1)?()(2)1V=34V=340.02m3=610-6m3,F=G=5.610-3kg10N/kg=5.610-2N,ρ=Fg=0.93103kg/m3,(2)P=ρgh=0.93103kg/m310N/kg0.1kg=930Pa3.201027.25ρ(1)(2)(1)m=m1m3…………………………………………………(1)F=G=mg=(m1m3)g………………………………………………………(1)(2)m=m2m3………………………………………………………(1)V=V=mρ=m1m3ρ……………………………………………(1)ρ=mV=m2-m3m1-m3…………………………………(1).4.201010.6kg0.1m200cm225cmg=10N/kg=1103kg/m3123425m1m2m3GeneratedbyFoxitPDFCreator©FoxitSoftware=m/V=0.6kg/0.001m3=0.6103kg/m32P=gh=1.0103kg/m310N/kg0.25m=2500pa3P=F/S=G/S=mg/S=0.6kg10N/kg/0.02m2=300pa4F=gV=1.0103kg/m310N/kg0.001m3=10NG=F-G=10N-0.6kg10N/kg=4Nm=G/g=4N/10N/kg=0.4kg52010211ρ2ρ3ρ1l12l221223)(ρρρρ+-=llx6201035124860t2.7mg10N/kg121F=G=mg=4.86×106kg×10N/kg=4.86×107NG=F=4.86×107Nρ=m/VV=V=m/ρ=4.86×106kg1.0×103kg/m3=4860m3122ρ1ρ1ρ2ρ211212GeneratedbyFoxitPDFCreator©FoxitSoftware(1)v=34×200cm3=150cm3=1.5×10-4m3F=gv.....(1)=1000kg/m3×10N/kg×1.5×10-4m3=1.5N…….(1)(2)P=gh.......(1)=1000kg/m3×10N/kg×0.35m=3.5×103N………(1)(3)P/=FS=GS..(1)=32360210Nm-×=1.8×105Pa………(1)820102110N4N21.F=GF=10N4N=6N(1)F=g12V(1)V=1.210-3m3(1)=GgV=0.83l03kg/m3(1)GeneratedbyFoxitPDFCreator©FoxitSoftware=G=10N