2020-2021学年重庆某中学八年级(下)期中物理模拟试卷(附答案详解)

2020-2021学年重庆某中学八年级(下)期中物理模拟试卷(附答案详解)

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时间:2023-03-17

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17ூwx௃wKAஹ¸ᘤ!?¹;FᑁºḄe?Ḅᦑ2Ḅ˧HPᩩÌÍᦑA┯7(8ஹ»☢ᡠḄᜧ$F᦮ÏÐÑḄᵫ¸ᘤ!?¹;FᑁºḄe?ᑣº;᦮ÏÐÑḄḄ˧HPᩩ.ᔣiḄÌÍ8¸ᘤ!ḄᐰNºÔ45Õ45ᦑ8&'(Cஹ¸ᘤÖNᡠḄpiḄᜧ$~¼2ᨵᐵᵫ¸ᘤ!?¹;FᑁºḄe?ᑣX☢12ᒴijḄ᪷Ùp=pghÚPiḄ˧HPᩩÌÍᦑC┯7(Dஹᵫ¾¿☢À45᪷Ùp=*Ú¸ᘤ¬»☢ḄP2~ÕḄ˧?¹Ḅᦑ஺┯7஺ᦑ⌱8஺11.ூxᫀ௃Dூw᪆௃wKn⚪!ᱥ¬Ûᢝ☢ḄᐸᙠÞßàáâ¬ᙢ☢Ḅ?᪷ÙÂÃKFG°ᵬ_஺çP=S=<ᜫ=7Gᵬ'G7/êYᔣÞßPNᑖÔᵬḄᜧçḄᑣ—>í◊ᵬDçHÞßàÔ☢ÀḄᜧ$ᐵ°45ᵬ¬ᙢ☢Ḅ5ᜧîïᵬÞßḄðñò$óHᵬnôḄÀ$çḄÀᡠᵬÞßḄPõ$çḄᓽᵬÞßḄöePõ$çḄöe⌱⚗஺øᔠ⚪ù஺ᦑ⌱KD஺ᵫËÚú&ᵬḄÀ$ú&çᦑᵬḄUa$çḄUaᵬ~ᙢ☢Ḅ¾¿☢À=$çl~☢ÀEð=îÞßEàûPð?¹Ḅ(ÞßPNᑖÔ¾¿☢ÀEðᨵüᦋ55îïýᱥḄöeEðüᦋ55$ḄþPÏîïöe#$Ḅðñòᜧ஺wÿ⚪ḄᐵᮣᵨḄᳮᨵḄ⌕஺12.ூᫀ௃Aூ#᪆௃#%ABC,ᵫ'(A)*P>P+,'-8./ᦑ஺=஺,//B=G;3'-C4/,618⚓ᐳ40⚓

18ᦑP0P1/Fc=G,ᡠ<=>?@ḄABᐵCD%PᵨEP30P1,BGCIᑮḄ/ᜧLᐵCDM/B=F4,=Nᱥ@᣸Q?@Ḅ@RSTUTVᐸXY@R᪷[M/=P஻V^(AG8ᡠI/ᜧLᐵCDFb4EFB/ᡠ<=Nᱥ@IᑮḄ/ᜧLᐵCDdeEFB=dᒹgDᱥ@hஹj⊤☢Iᑮ?@ḄmTVᱥ@IᑮḄ/gAj⊤☢IᑮḄᜧV/noᵫVAᱥ@j⊤☢pBpo?@ABLᡠ<ᐸAGBj⊤☢IᑮḄᜧLqrnᡠ<ᱥ@j⊤☢Iᑮ?@ḄᐵCsD%&=&uvnᦑ4wrBC┯yn஺ஹᵫ'(ᵬஹ,?@{@RS|P}EPzᱥ@ᒕᵬஹ,?@@RS|ᑣḄᦪsmaEC4/ᙠ3ᘤ-ᱥ@ᒕ,?@@RLV3?@@R(PzEPDᡠ<ḄᦪnibEmE%ᓽniaVmbVMcᦑ஺┯y஺ᦑ⌱%Ao(1)᪷[ᱥ@Ḅ/)ᩩs(=Nᱥ@ᡠI/ᐵC஺ᯠ᪷[ᱥ@hஹj⊤☢Iᑮ?@ḄmTVᱥ@IᑮḄ/ᑨ=Nᱥ@j*☢ᡠI?@ᜧL஺(2)¢ᐰS|Ḅ=N¤¥ᘤᑣᐸ¦ஹABஹ@Rஹ*☢RᙳS|A)*¨©ªᱥ@AB«ᵬ?@ḄABᐵC᪷[ᱥ@/)ᩩªᱥ@«,ஹ3?@ḄABᐵC©ª=>?@ḄABᐵC஺¬⚪ὃ®¯?@ஹ°±²³´ᳮGᱥ@/)ᩩḄᳮ#Gµ¶ᳮ·⚪¸ª=>?@ḄABᐵC#¹º⚪Ḅᐵᐸ»B¼ᜧ஺13.ூᫀ௃Cூ#᪆௃#%Aஹᩈᙽ¦G=mg=0.3kgx10N/kg=3N,ᩈᙽÃᵨÄÅÆḼÈÉᙠÊ-ᩈᙽIᑮËÌᔣjḄ¦ஹÆG/ᩈᙽᡠIḄ/TVᩈᙽḄ¦ÎhÏÐÑḄÆᜧV3N,ᦑ4┯yn

198ஹ᪷[ḄÒ⊝Ḅᩩs(ᡲÕIᑮḄTVÊÖḄ¦+ÊḄ¦+ᩈᙽḄ¦F=G=mg=(0.5kg+0.1kg+0.3kg)x10N/kg=9N,ᦑB┯y.&&CஹᩈᙽÈᐭÊ-ÙᩈᙽIᑮḄ/ᜧV¦ḄÚÏÐÛᩈᙽ4/ᙠÊ☢hÊÜÝjÞ.ᘤ*ßIᑮḄÝàL᦮NâãÊÖ*ḄäᓄæTVᩈᙽ/Ḅäᓄæᩈᙽ4/ÙIᑮḄ/?2=஺=3N,Ùᨵ|☄Ê☢Èᐭ@RD|éᐰÈᐭÙIᑮḄ/|x3N=5N,êF=êd/=&-d2=5N-3N=2N,ᦑCwrngDìḄᘤí☢Ḅᡠᨵ¦ᙠᩈᙽh/Ḅâã-ᦪàLnᩈᙽ4/Ùᦪîäï´ᩭḄᦪᦑᦪqÝäḄᦑ஺┯y.ᦑ⌱C.(1)ᩈᙽIᑖ᪆%ÛÄÅòᩈᙽIᑮËÌᔣjḄ¦ஹÆGËÌᔣhḄ/n(2)᪷[ḄÒ⊝Ḅᩩᑖ᪆ÊÖóḄn(3)ôÖᑁᱥ@ÚöN᦮@ᑖ᪆#.⚪ὃ®¯°±²³´ᳮஹḄÒ⊝ᩩḄ÷ᵨøᔠឋ¼ᨵḄ»B.14.ூᫀ௃Dூ#᪆௃#%Aஹᵫ'û(Úh=0ÙÙüýḄᦪTVᙊ¤@Ḅ¦ᡠ

20஺ஹᵫu=ShS'ᙊ☢TᓣḄV+h=W=XᘤZ=0.04m=4cm,ᑣᙊ[\ḄV+N8cm-4cm=4cm,ᦑ஺┯^஺ᦑ⌱D.(1)᪷abcᑖ᪆fᱥḄghᐰḄi᪷ajk%=G-FlfḄᜧn(2)᪷aF=oḄpjkP^=/lfḄ*+(3)ᑨrfᙊ(@L☢ḄCstᙊ(hḄugv᪷ajkp=(lfCMwS7ᙊஹᙊ(ஹ89:;᦮xyᑖ᪆(4)᪷aᱥ᣸"Ḅ#hᙊ(z☢#S{'☢TᓣḄV+ᯠ}{fᙊ[\ḄV+஺⚪:⍝ᨵᐵḄl⚪ᑮᨵᐵCMh*+ḄlbcᱥḄghḄ&⚪Ḅᐵ஺15.ூᫀ௃Bூ&᪆௃&4ᙊpᩈᙽᵬḄgN:Gᵬ=mᵬg=p/ᵬg—p8ὡhᵬg—0.6x103kg/m3x160x10-42057nxnlxlON/kg=48N,ᑣᩈᙽᵬ@ᙢ☢ḄCMN“ᵬ°ᵬ48NQnnnnpᵪ=—=—=--------T—r=3000PQ,:ᵬSᵬSᵬ160X10-427np=pghS@ᘤzḄCMP=Pgh=1x103kg/m3xION/kgx0.2m=2000Pa,ᦑA┯^A¡¢£ᔣᑗ¦ᵬḄ;¨¡¢©ᐭ«☟}Ꮇ¯ᩈᙽ°ᙠᵫ±4²³´µᳮSᑣ᣸"Ḅ#NFa%ᩈ,X48NஹஹV==--=--------------=1.2x10-3m3,BPgPgl.ox103kg/m2xION/kgᑣᵬ¸ᐭḄ¹+N_»_1.2X10-3^3h-D-1-1~-0.3?71ᵬX160X10-42,7n

21«☢¸TᓣḄV+N.V1.2xl0-3m3B¼/io=—=---------==0.06m,ᓃS200X10-427nᡠ½«¹Nh=¾¿+ah=0.2m+0.06m=0.26m,BBᦑ«¹ntᵬ¸ᐭḄ¹+ᑣ¡¢£ᔣᑗ¦ᵬḄ;¨¡¢©ᐭ«¸Àzᦑᵬ᣸Ḅ#st«☢TᓣḄ#¯«☢TᓣV+NA/l,ᑣᨵÁ,(/!+Ah)=Sz•¼Ä[x160cm2x(20cm+¼h.)=200cm2XAh,ᑣ4h.=5cm,ᡠ½¡¢£ᔣᑗ¦ᵬḄ;¨¡¢©ᐭ«☟}@ᘤzḄCMÅvN4PB=pg¼h=1x103kg/m3xION/kgx0.05m=500Pa,ᦑ8CÆ£ᔣᑗ¦ᵬḄ:ÇM,¨¡¢©ᐭ«☟}ÈᎷ¯ᩈᙽM°ᙠ☢ᵫ±²³´µᳮSᑣᩈᙽM᣸"Ḅ#NFᵬX48NrooV=----==--------—;-------------=2.4x10-3m3,CPgPg1.0xl03k^/m3xl0N/k^ᑣᩈᙽM¸ᐭḄ¹+N,V2.4xl0-3m3…ch=—=7-—=0.15m,cSᵬ160xl0-47n2«☢¸TᓣḄV+NV2.4x10-33c7n¼/l=--=77777A~~7=0.12mcCS«200X10-427nᡠ½«¹¸Nh.—h+h—0.2m+0.12m—0.32m,ccᡠ½«¹ᜧt«ᘤḄV+ᨵ:Éfᑣ«¹¸N0.3m,ÊMᐭḄ¹+nt«Ḅ¹+ᑣᩈᙽM°ᙠ☢@ᘤzÅvḄCMN¼Pc=Pg¼Ë'=1x103kg/m3x10N/kgx(0.3m—0.2m)=1x103Pa,@ᘤzÅvḄCN>F=>pcS4=1x103Pax200x10-4m2=20N,cÌᩈᙽᵨᑮN:O22⚓ᐳ40⚓

22FC=G>=X48N=24N,ᦑC┯^DÎ7ᵬᐰ¡¢©ᐭ«Ꮇ¯ᵬ°ᙠ☢ᵫ±²³´µᳮSᑣᵬ᣸"Ḅ#N-33V——--------------------------4.8X10m,DP9p3kg/m3xlON/kggl.OxlOᵬ¸ᐭḄ¹+NW=—I஺7=03muS,160xl0-4m2'l)«☢¸TᓣḄV+NÏ,V4.8x10-33D7n/in=——=-----------=0.24m,u200xl0-47n2ᡠ½«¹¸Nh=h+>h=0.2m+0.24m=0.44m,DDᡠ½«¹ᜧt«ᘤḄV+ᨵ:Éfᑣ«¹¸N0.3m,ÊᵬᐭḄ¹+ាÑst«Ḅ¹+ᑣᵬាÑ°«Ḅ#N5/=(5/:S*)Ë«=(200-160)xICT42*O.3TH=1.2x10-3m3,nlᑣ«ḄgNG¿'=m@g==1.0x103fc,g/m3X1.2x10-37n3xION/kg=12N,ᑣ«ᘤ@ᙢ☢ḄCNA=G/+GÁ=12N+48N=60N,Ìᨵ©ᐭᵬÒ«ᘤ@ᙢ☢ḄCNF3=6=mg=pUg=p5¿Ë¿g=1.0x103kg/m3x200x10-4m2x0.2mxlON/kg=40N,ᑣ☟}«ᘤ@ᙢ☢ÅvḄC¼=%n'-F=60N-40N=20N,zᡠ½☟}«ᘤ@ᙢ☢ÅvḄCMNPo=Õ=200W=l00°Pa,ᦑ£>┯^஺ᦑ⌱B஺(1)᪷aP=ghp=pg/iᑖØ{fᵬ@ᙢ☢ḄCMh«@ᘤzḄCM(2)¡¢£ᔣᑗ¦ᵬḄÙ¨¡¢©ᐭ«☟}Ꮇ¯ᩈᙽ°ᙠ᪷a±

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29ᑣF=F—Gᳫ=IN-mᳫg=IN-0.08kgxION/kg=0.2N஺ᦑᫀ90D0.2o(1)ᵫ⚪&ᳫn/ᙠ⏀k>&ᳫḄqA'@ᑮḄ/A-:;&ᳫḄ⍝ᔠiḄ$%ᑭᵨU=£;ᔠiᳫ>ᔠiḄ.SD⍝᣸R⏀kḄ;᣸R⏀kḄ.S(ᔠiᳫḄ.S);<ᔠiᳫ~ᑖḄ.SD(2)ᔠiᳫ(>ᑭᵨEFGHIᳮ;@ᑮ(Ḅ/A5&ᳫ@ᑮḄ/A'ḄA&ᳫḄqA-:;ḄA஺T⚪ὃVWᱥ./0ᩩ2)EFGHIᳮஹ$%ḄXᵨ⌕~ᑖ.5.Ḅ.S)~ᑖḄ.S஺25.ூᫀ௃1.5x1030.7x103ூd᪆௃d(1)N(¡>(ᑘ=15cm,:5ᩈᙽḄ⊤☢@ᑮ(Ḅ§Pi=Pgh[=1x103kg/m3x10N/kgx15x10-2m=1.5x103Pa;(2)ªᩈᙽlmῃ¬N(¡5ᩈᙽ®⊤☢ᡠᜐḄ¯%°±=h-h=32cm-2010cm=22cm—0.22m,:5ᩈᙽḄ®⊤☢@ᑮ(Ḅ§p=p²g/i.=1X103kg/m3xION/kgx0.22m=2.2x103PaD2ªᩈᙽlmῃ¬N(¡5ᩈᙽᡠ@qA³ᩈᙽ⊤☢@ᑮ(ḄAB)'ᩈᙽ®⊤☢@ᑮ(ḄA´ᔠ§Ḅµ¶r=pSpG²+P[Sᩈ=p2sᩈᑣG#=p2s²-P1S«=(P2-P1)S«=(2.2x103Pa-1.5x103Pa)x(0.1m)2=7N,ᡠoᩈᙽḄ6=(=¼½=0.7kg,ᩈᙽḄ.SV=(0.1m)3=10-3m3,ᡠoᩈᙽḄ$%0=£=n¿=0.7*1033/À3,ᦑᫀ1.5X103D0.7X103஺(1)ᑭᵨp=pg/iÁÂᩈᙽ⊤☢@ᑮ§D(2)ªᩈᙽlmῃ¬N(¡5ᩈᙽᡠ@qA³ᩈᙽ⊤☢@ᑮ(ḄAB)'Ã30⚓ᐳ40⚓

30ᩈᙽ®⊤☢@ᑮ(ḄA-:;<ᩈᙽḄqA)ᑭᵨ$%;<ᩈᙽḄ$%஺T⚪ὃV.§)$%ÆᐵÈZÉTÆᑁ˽ÌÍÎÏÐᑖ᪆ᓽ஺26.ூᫀ௃2.44ூd᪆௃d(1)ÑÒ>ᱥ.A᣸R(Ḅ.SÔ=ᓃ=200x10-6À3,ÑÒ>ᱥ.A@ᑮḄ/AF=pgV᣸=1.0xlO3^/7713xION/kgx200x10-6m3=2N.ÙÚ.ᱥ.AḄqAG=mg=160x10~3kgxION/kg=1.6N,AAÒÑ>ÙÚ.ᱥ.A@ᑮÛÜᔣ®ḄqA)A?ßஹÛÜᔣḄ/Aàᵨᜐ'á⊝8᝱ᵫÙÚ.ᱥ.A@ᑮḄᔠAãpG+F^=F,Aᑣr=F-GA=2N-1.6/V=0.4/V,C'ᵬÒåÒ>Ëᘤçè☢AḄé>F1=GA-16N,C'ᵬÒÑÒ>Ëᘤçè☢AḄéê=G+F஻=1.6/V+0.4N=2/V,xᡠoC'ᵬÒÑÒ>Ëᘤçè☢§é³åÒ>Ëᘤçè☢§éḄCì2N1.6N(2)íîåÒ>ḄÐïᱥ.A7/@ᑮḄ/Ar/'=GA=1.6N,᪷-//=P²g▲᣸R(Ḅ.S:=1.6x10-4m3,LOxltPkg/3xlON/kg7n᪷-V=Shᱥ.AḄ☢S:SA=^=Ã=20c*=2x10-3m2,

31:5ᱥ.4Ḅ¯%:=0.08m=8cmS2XT0-3m2Aᑣᱥ.Aᐭ(>ᑖ)ô%ḄCìõ=310cm5öËᘤᑁ(Ḅ¯%“ᑣ(Ḅ.S“=SH-V“ᱥ.Aù¬ËᘤḄô%”Z%=H—0.08m,ᱥ.Aᐭ(>Ḅûïᑖᑗᣵþ<(ûïᑖAᙠ(>.SḄ[ÿ)ᑣᒕᑖḄ10cm~~-=6cm,ᱥAḄᙳᡠ!ᱥA"ᐭ$ᑖḄ%&'("ᐭ$Ḅhg=gx6c/n=4.8cm=0.048m,ᒕᑖ᣸2Ḅ34V"=Sh,^=2x10-32X0.048m=9.6x10-5m3,ffAnl'(Ḅ;4<+%"+%S1.6xIO"m3—9.6x10-5m3=H—0.008m80x10-4m2'(ᱥAᒕᑖBCDᘤFḄ“'I^=(H-0.008m)-0.048m=H-0.056m,ᑣAᒕᑖJKLDᘤFMNḄBC4OP=-QJ)I(“IP)=(H-0,056m)I(H—0.08m)=0.024m=2.4cm,ᓽAᒕᑖJKLDᘤFWMX2.4cm஺ᦑ[ᫀ4J;2.4o(1)᪷`iz=ShdefgᱥAḄ3ᓽhi$ᱥA᣸2Ḅ3᪷`/j=pFgvὡaehi$ᱥAkᑮḄmno᪷`G=mgdefgᱥAḄqnih$fgᱥAkᑮrsᔣuḄqnvnwFஹrsᔣWḄmnyᵨᜐL|⊝~᝱᪷`fgᱥAkᑮḄᔠndevnJ%Lᵬii$DᘤK☢vnḄLAḄqnhi$DᘤK☢vnḄLAḄqnvn᪷`p=?dei$DᘤK☢v32⚓ᐳ40⚓

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33vnäå☢ᚖsḄᐵèãÁvnḄgᔣ4(2)ᱥéLæ☢WvnqnḄᜧÙஹgᔣஹyᵨÚᙳJê.¬⚪Ḅᐵ¿½¨⍝vnḄyᵨÚᙠäå☢W!ëvnḄgᔣ½ᚖsLäå☢ìᢣᔣîvᱥḄ.ூÅ[௃Å4ᙠæ☢W⌱£ᱥäå☢Ḅ$ÚvnḄyᵨÚðvnyᵨÚËᚖsLæ☢ஹÌÍᜮḄÏᓽvnÑÞi᝞iᡠÑ429.ூ[ᫀ௃OABCᡈADBCABF-F=F-FLbacdூÅ᪆௃Å4(1)XôÙõöᙠÙ᫜äø¹ᐜᑖùúeûᙽý᫜Ḅqnᡠ!ᔠᳮḄþÿD48CᡈAO8C(2)AᱥḄ8ḄᱥᙠḄᵫ"#$ᱥ%ᑮḄ'ᡠ)*+,-'Ḅᜧ/0ᙽḄG=56ᙠḄ7ᑣ/'=:;<=0ᙽ᣸?Ḅ@A᫜CḄDEF᫜GHI:᣸=1-%M8-<=£-Fdᑣ$QRᐭTḄᱥᡠ%'Ḅᜧ/@Aᱥ᣸?ḄTᡠ%Ḅᜧ/ᓽV'=G᣸஺(3)ᵫ(2)Yᱥ6T%ᑮḄ'Zᡝ'=5-\ᱥ᣸?TḄZ%=FLFaᦑ⊤F_ᜐabᑏZ᫜E᣸?ḄGD/NZe3fghᱥ%ᑮḄ'V'=2.4N-1.7N=0.7N,(4)ᙠjᵨlmMᢣ┐6ᨵqrᑣsftuvgttDwᜧ(/);xḄtᦑ*fḄHtyzḄᓽḄ't{yz஺ᦑ|ᫀZ(l)ZMBCᡈὅAOBC(2)AB;=᧊;&@A(3)᫜E᣸?ḄG/N0.7(4)yz஺(1)ᙠ◤ᐜF᫜C/0ᙽḄ0ᙽᐰ6ᙠᨬ᫜C᣸ḄDe34⚓ᐳ40⚓

34(2)'@AAB*fḄᦪGHᱥ%ᑮḄ'@AlmḄ⌕hQᳮ⌕ᱥḄ'$᪷/'=G-F¡¢ᯠ᣸?TḄ*ὅ¤¥u¦ᓽ$hQ஺(3)᪷ᱥ6T%ᑮḄ'Z§'=¨-ᱏᱥ᣸?TḄZG^=F-FCdᑖ᪆⊤F_ᜐabᑏḄᑁ(4)ᙠjᵨlmMᢣ┐6ᨵqrᑣsftuvgttDwᜧ(/);xḄt®ᑖ᪆஺¯⚪±ὃ³´µ¶ghḄ·¸¹º´µ»ᔲ·¸s+,-)½s;,⌕Ḅ¶¾¿⌕¯YÀ·¸Ág⚪±yÂÃ஺30.ூ|ᫀ௃107.2107.24zᜧ᣸?TÆ0.5zᜧzᜧூÈ᪆௃ÈZ(1)᪷ᵬEÊᵯÌÍᦪHÎm=1107.2g-1000.0g=107.2g,ᑣᔠÓ6¶ᘤÕÖ×ØḄÙ§=Îmg=107.2x10-3kgxlON/kg=1.072/V,᪷ḄÜᵨÝÞḄᔠÓᡠ%'§ß=§=L072N,᪷ᳮ§'=Pgvᵪ=—=——--°7.------=1.072x10-4m3,᣸pgIxlO3kg/m3xlON/kgäᔠÓᐰ6ᡠ)ᔠ½=å=1.072x10-4m3=107.2cm3,ᔠÓḄç¹Zm428.8஺..Qp=/=T^^=4g/cm(2)êÊᑮëìᵯÌÍᦪzᓄ$YîᳫᐭḄÆzᜧîᳫ%ᑮḄ'zᜧðR'ᜧ/E᣸?TÆᨵᐵ(3)êÊᑮòᘤ¶ᵯÌÍÙḄzᓄZΧ=ÎG=Îm'g=(1107.7-1107.2)x10-3kgXION/kg=0.5X10~2N,ᘤ¶ᵯÌÍÕÖḄÙôḄzᓄZF0.5x10-2%Îp=—=------=0.5Pa1S100xl0-4m2(4)᝞òᡠøøᡭ?ᘤúûᢝᔠÓᙽýþyzÿ〉ḄᑣᑣᳫᡠᳫḄᜧᐵᘤᳫ᠒ᔣ

35᜜"ᑣᳫᡠ#$ᑣ%&'(Ḅ)$*ᜧ+ᦑ-ᫀ/0(1)107.2+107.2+4+(2)ᜧ;᣸45+(3)0.5Pa+(4)ᜧ+ᜧ஺(1)᪷8ᵯ(:ᦪ8<=ᔠ?@AB*CḄDEᔠ?ᑮ#$GHEIᔠ?ḄᑭᵨLMNOEᔠ?LM+(2)#$ᜧP5LMQ᣸45ᨵᐵ+(3)E*CḄ$ᑭᵨP=gEᓄ+(4)5T5LMQMᨵᐵᳫ"᣸45Ḅᡠ#$8UV-+W⚪ὃZ[LM\]^ᐵ_`abWcdᑁfghijkᑖ᪆ᓽo஺31.ூ-ᫀ௃2.70,4M2.7x1031.2x103stuvwூx᪆௃x0(1)yz\$<Ḅ{|ᜧ}~⊤1M{|}~⊤0.1N,yz\$<ᦪ`2.7N+(2)ᙠ]^BB?ᙽᡠ#$0F^=G-F=2.7N-23N=0.4/V.B(3)]^AஹBஹCஹD,5ḄLMᱥ᣸45Ḅ⌲ᜧyz\$<ᦪ⌲ᱥᑮḄ#$*ᜧ#$ᜧTᱥ᣸45Ḅᨵᐵ+ᑖ᪆]^஺ஹE,5ḄLM᣸4Ḅ5ḄMyz\$<ᦪ#$o#$ᜧTMsᐵ+(4)?ᙽḄ$G=2.7N,?ᙽḄD`=(=Vញ=0.27kg,?ᙽ@AᙠBᑮḄ#$0F=G-F'=2.7N-1.7N=LON,?ᙽ᣸4Ḅ0—==-XL஺/=C?ᙽ@AᙠB?ᙽḄ/0=10-4m3,?ᙽḄLM0p=£==2.7x103kg/m3-,?ᙽ@AᙠBᑮḄ#$0F^.=G-F"=2.7N-1.5N=1.2N,᪷8ᳮoc5ḄLM/0஺5=◥=H‒¡=I?x^kg/m3ᵫw£#=6-ᓃᢣ┐ᢣᙠ0.2NḄ§¨©ª«¬4]^®¯Gஹ°±ᜧ²`³´36⚓ᐳ40⚓

36ὅ°#ᜧ`¸¹º®¯\Ḅ5ḄLM`¸¹º;(5)ᱥ@ᐭBḄ¾ᩭ¾ᜧÀ᣸45Ḅᜧ᪷8°#=஺Á9Ã᪍ocᱥᑮḄ#$ᜧÅ/Æ#=G-Fe,ᡠyz\$

37(2)÷᪾ᑮḄè$/1.23195X106Woூx᪆௃(1)c⍝êëìᡠᜐḄMQèḄLM᪷8p=pghEᙠ6300ᜐᑮḄè+(2)c⍝êëì÷᪾ᑮḄQ⊤☢᪷8p=ÿᑮḄ஺⚪ὃḄᓫᵨ⍝ᓫḄ!"⚪஺33.ூ&ᫀ௃)*(1)ᵫ/012Ḅ34/?0cm:ᵯ<=>ᦪ100g,ᓽ*MDᘤḄFG*m=100g=0.1kg,DᘤḄJ*G=mg=0.1kgxlON/kg=INN(2)ᵫ/0P34h=3cm:ᵯ<=>ᦪ400g,ᓽDᘤḄSFG400g,ᡠUFG*m■F=⊈SWD=400g-100g=300g,Y*VF=Sh=100cm2x3cm=300cm3NZ4*P=£=3oocmi=I஺/஺/=1x103kg/m3N(3)᪷_p=£1aᙊcAḄY%=h=f%=240cm3NAḄg4*hi=jk=6ḄNmAnoᑮDᘤp:qrᐰtuᑣ☢g*h'=—A-=——30°cn13_j=5cm<6cm,Ꮇ{ᡂ}NSD-S*100cm2-40cm2U-1-iAtᐭ☢ᓣḄg4*=%'—h=5cm—3cm=2cmN:*V᣸=Sh'=40cm2x5cm=200cm3=2x10-4m3NA4ᑮḄ*F=0F95᣸=1x103kg/m3xlON/kgx2x10-4m3=2N,G=mg—0.216kgxION/kg—2.16N,AA

38(3)ᙠᙊctᐭḄPᵯ<=>ᦪ¡¢£ᓄ:DᘤpḄiᙊctᐭ200P”஺ூ)᪆௃(1)ᵫ/012Ḅ34§i”:ᵯ<=>ᦪᓽDᘤḄFG¨>ᦪ᪷_G=mg1J*(2)ᵫ/ª12ḄFG«Y᪷_Z41Z4N(3)᪷_Z4ᙊcḄYᑖ᪆)aᙊctᐭḄ34Ḅ£ᓄG¢᪷_p=pg/i1ᵯ<=>ᦪ¡¢£ᓄ:DᘤpḄiᙊctᐭ®¯஺⚪°⌕ὃJஹZ4ஹஹ³2´⍝µᔠ⚪஺34.ூ&ᫀ௃)*(1)᝞/ᵬᡠ>q:ᩈᙽDᘤpḄ*F=G=mg-0.6kgxION/kg=6N,ᩈᙽDᘤpḄ*P=3TA-100X10-47n2(2)᝞/0ᡠ>P»ᐭY600cm3:ᩈᙽDᘤpḄ¼½0,:ᩈᙽᜐ¿ÀÁ᝱ᑮḄ=G=6N,ᵫ?=29L1a᣸ÆḄY*6x10-43-600cm3,7nl.OxltPkg/MxlON/kgᑣᩈᙽtᐭḄY:ᵫ»ḄYU=(SDsᜧMᳮ1aDᘤḄp☢Y:5+S=6°࠷—+100cm2=200cm2.Îhjᩈ6cm(3)ᵫp=£1aᩈᙽḄY:ᩈᙽḄg4:ᵫ/ª12P»ᐭḄY1600cm3:ᩈᙽា½tu,

39PY1800cm3:ᩈᙽ⊤☢ᑮ☢ḄÒÓb=18°࠷Õ-ÖÕ=ha,1200cm2×ØÙ<ÚÛÜᩈᙽᜐ¿ÀÁ᝱ᑮḄ6N,᣸ÆḄY600cm3,tᐭḄ346a",ᑣᩈᙽ⊤☢ᑮ☢ḄÒÓÞ2=hᩈZ11m=10cm-6cm=4cm,ᩈᙽ᣸ÆY߯àá☢noḄg43=â1=◥äc>=2cm,PᩈᙽÚÛÜÙØÜᩈᙽåæÒÓ*=1+%3=1c7n+4cm—2cm=3cm஺&*(1)᝞/ᵬᡠ>q:ᩈᙽDᘤpḄ600aN(2)᝞/0ᡠ>P»ᐭY600cm3:ᩈᙽDᘤpḄ¼½0,ᑣDᘤp☢Y200cni2N(3)PY1800cm3:×ØÙ<PᩈᙽÚÛÜÙØÜᩈᙽåæÒÓ3cm.ூ)᪆௃(1)᝞/ᵬᡠ>q:ᩈᙽDᘤpḄçèḄJ³᪷_F=G=mgᐸᜧWᑭᵨp=ìᩈᙽDᘤpḄN(2)᝞/0ᡠ>P»ᐭY600cm3:ᩈᙽDᘤpḄ¼½0,:ᩈᙽᜐ¿ÀÁ᝱ᑮḄçèḄJ³᪷_=஺9^)᣸ÆḄY,ᑭᵨU=S/iᩈᙽtᐭḄYᑭᵨ»ḄYᗕ=(S-Sñ)”DᘤḄp☢YN(3)᪷_p=/ᩈᙽḄYᑭᵨV=SÞᩈᙽḄg4Nᵫ/ª12P»ᐭḄY1600°m3:ᩈᙽា½tuᯠÜY1800cm3:ᩈᙽ⊤☢ᑮ☢ḄÒÓ×ØÙ<ÚÛÜᩈᙽᜐ¿ÀÁ᝱ᑮḄ6N,᣸ÆḄY600cm3,tᐭḄ346c_ᩈᙽ⊤☢ᑮ☢ḄÒÓᯠÜᩈᙽ᣸ÆY߯àá☢noḄg4õöPᩈᙽÚÛÜÙØÜᩈᙽåæÒÓ஺⚪ὃJஹᱥᩩùஹúûüýþᳮஹZ4Ḅµᔠᵨ³⌕»ÿᩈᙽ᣸☢஺40⚓ᐳ40⚓

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