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        1. Ӣҽ̾W(wng) > > }ĿԔ
          2010?ӑchģijƼСMͬW(xu)O(sh)ӋһˮдwģDʾDEGHǶ݆MDŽӻ݆ܗUBC@OcQֱƽ(ni)D(zhun)OCOB=34ܗUBCͼ(x)K|(zh)ԲӋվڵͨ^KˮеwAĵe300cm2˵|(zh)70kgͨ^(x)KʩQֱµF1r挦֧N1A0.6m/sٶȄ(dng)ܗU_(d)ˮƽλÕrwAwe֮¶ҺҺ½50cm˕rF1ĹʞP1ͨ^(x)KʩQֱµF2rwA0.6m/sٶȄ(dng)wAȫx_Һr挦˵֧N2F2ĹʞP2֪A|(zh)75kgN1N2=21Լ(x)Kc݆ĦԼˮwgȡ10N/kg
          1(dng)w¶Һ鿂we֮rwܵĸ
          2ӻ݆MܵG
          3P1P2ֵ
          ڴ}УwAr(j)ƽ֪RԼ׵ԭAܵĸٌ݆M(jn)зY(ji)τӻ݆݆֪Rһ}Ŀ漰ٽY(ji)ˌĉ(qing)֪RܗUƽlڴ}еry(tng)I]cP(gun)֪RY(ji)ƽ݆ܗU(qing)֪R漰ĹʽԭȿKQ}
          ⣺1(dng)w¶Һ鿂we֮rˮ½50cmĶpС_ˮweҲwwe֮wweV=Sh
          5
          2
          =30010-4m20.5m
          5
          2
          =0.0375m3
          ˕rw_ˮweV=
          3
          5
          V=
          3
          5
          0.0375m3=0.0225m3
          wܵĸF=gV=1000kg/m310N/kg0.0225m3=225N
          𣺮(dng)w¶Һ鿂we֮rwܵĸ225N
          2ArDףܵGAFA1
          ͸F1ã̎ƽB(ti)
          tУFA1=GA-F1=750N-225N=525N 
          (dng)Aȫx_ˮrܵGAFA2̎ƽB(ti)O(sh)ܗUcˮƽɊAǞB
          tУFA2=GA
          OB?COSB
          OC?COSB
          =750N
          4
          3
          =1000N
          ӻ݆BrDF(xin)A1cFA1ȣ໥F(xin)A2cFA2ȣ໥
          tУAȫrFC1=G+2FA1=G+1050N
          Aһ]rFC2=G+2FA2=G+2000N
          CrDF(xin)C1cFC1F(xin)C2cFC2ȣ໥
          ֪lʽʽڿɵã
          FD1=
          1
          2
          G+FC1=
          1
          2
          2G+1050N
          FD2=
          1
          2
          G+FC2=
          1
          2
          2G+2000N
          ܗUrD
          ɸܗUƽl֪FD?OD=F1?OEF(xin)D1cFD1ȣ໥F(xin)D2cFD2ȣ໥֪lʽʽܣɵã
           F1=
          OD
          OE
          ?FD1=
          1
          2
          FD1=
          1
          4
          2G+1050N
          F2=
          OD
          OE
          ?FD2=
          1
          2
          FD2=
          1
          4
          2G+2000N
          ãG =100N
          𣺄ӻ݆MܵG100N
          3M(jn)DF(xin)1cF1ȣ໥
          P1=F1V=
          1
          4
          2G+1050NV
          P2=F2V=
          1
          4
          2G+2000NV
           
          P1
          P2
          =
          8
          11

          P1P2ֵ811
          cu}CԺ܏(qing)yȺܴrķٌ}ĿM(jn)зֽ⣺}݆}ܗUƽl}(qing)}}ͨ^ЙC(j)ĽY(ji)һ𣬳}Ŀ֪lͿɽ}
          (x)ϵд
          P(gun)(x)}

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