2021年广西玉林市中考物理适应性试卷（附答案详解）

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2021
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ᦋCᵯ;(3))*OPQᐝDᵯKSTᐸ+ᵯKᵫVWXY)*ZᵯKᵫὶᵯḄᑖK\ᳮᑖ᪆ᱏḄ_ᔣ;ᵫVaXY)*OPQDḄᵯᵫP=U/bcᐸ+,᳛;

25(4)
HIḄ\ᳮdᑭᵨSᦔhijkY)*OPQᐝDḄᵯᵫP=/2R!bc()*Ḅ+,᳛஺G⚪ὃno“k()*Ḅᵯ,᳛”ḄHIὃnorst⚗ஹHᱥᵯVḄBCஹᵯ⊤ḄXᦪஹᵯ,᳛x/ḄFᵨyὃnoᱯz_jk)*,᳛{ᔠឋ~஺26.ூ7ᫀ௃&#ᶍ(ᳫᜐᑮḄMKᔣ
D(ᳫᐳᑮZḄᵨ(ᳫᑖᔣᔣḄ_ᔣ¡¢ᩩᨵᔣ¥¦ᵨG§⊤¨G

26ூ&᪆௃(1)VJ!ó²YᵯÏᙠᒴ▤¦ḄÕDô᪷öx/5="!¸ᓣḄÕ;᪷öx/W=!¸àḄ,;(2)᪷ö⚪s¸Yᒴå▤¦ḄëᙳÕ;µᑭᵨx/F=/¸YàḄᜧ(;(3)ᵯæᔣø64s,ᡠḄ,ᑖᔣᒴåᒴDᡠḄ,;᪷öx/P=/!¸ᵯæḄàḄëᙳ,᳛஺G⚪ὃnÕஹÕஹàஹ,ஹàSḄbcὃnäù☢ûüýþ⌕ὃnÿ
Ḅᮣᵨ⌕ᑖ᪆஺28.ூᫀ௃(1)ᵫ!"#Ḅᨵᦔ&ᦪn=3,ᵫ஺(=JW/*ᱥ,-ᓣḄ/01ᱥ=£=5^=0-2m/s,ᵫ"=8*9ᱥ,:;<1◤⌕Ḅ>?t=2=@-=60s.1;ᱥQ.2m/s*(2)ᵫp=£*ᱥ,Ḅ,BV=-=2E3=0.04m3,p5xl03kg/m3Cᱥ,DE>᣸GH,Ḅ,BIJKḄ,BLMᡠOᱥ,DEᙠQR>SᑮḄUF'=P7gV᣸=p7gV=1.0x103kg/m3xION/kgx0.04m3=400/V8(3)ᱥ,ḄVG=mg=200kgxION/kg=2000/V,WX"Y?Ḅ᥅[\"Vᱥ,]ᐰDEᙠQR>!Ḅ_`ᦔ᳛—x100%=-x100%=-GTJx100%=•…c*efx100%='Wg(G-FU+GhiG-FU+Gh2000N-400N+Gh80%,*hVGh=400N,ᱥ,jGQ☢lmn
!ḄoF=8(G+Gh)=gX(2000/V+400N)=800/V,mnSᑮḄqf=0.05G;=0.05x3X104/V=1500/V,

27Cmnᔣsᒴ/h>SᑮᔣsḄᱫvஹᔣx"#ḄoIqyᵨᜐ{|⊝~᝱,ᡠO>mnḄᱫv=F+f=800/V+1500/V=2300N,mnh_Ḅ᳛p=?=?=Fv^=2300/Vx0.6m/s=13801V8(4)ᱥ,]ᐰjGQ☢l!_`ᦔ᳛ri'=—x100%=Ghx100%=-x100%=—ᔳ—x100%x83.3%஺'W%
(G+Gh)hG+C,2000W+400Nj(J(1)9ᱥ,:;<1◤⌕605;(2)ᱥ,DEᙠQR>SᑮḄU4007V8(3)ᱥ,jGQ☢lmnh_Ḅ᳛1380W8(4)ᱥ,]ᐰjGQ☢l!_`ᦔ᳛83.3%஺ூ᪆௃(1)ᵫ!"#Ḅᨵᦔ&ᦪ᪷஻="ᱥᱥ,-ᓣḄ/0⍝<᪷v=9ᱥ,:;<1◤⌕Ḅ>?8(2)⍝ᱥ,ḄI0᪷P=£ᱥ,Ḅ,Bᓽᱥ,DE>᣸GQḄ,B,ᑭᵨFU=PH9%?ᱥ,DEᙠQR>SᑮḄU8(3)᪷G=mgᱥ,ḄVWX"Y?Ḅ᥅[\"Vᱥ,]ᐰDEᙠQRWᨵ(G-FU)/1G-FU>!Ḅ_`ᦔ᳛4=X100%=pX100%=FJx100%,Wg(G-U+Gh)CG-U+GhhḄV᪷=8(G+Gh)ᱥ,jGQ☢lmn
!Ḅoᑭᵨ/=0.05GmnSᑮḄqmnᔣsᒴ/h>SᑮᔣsḄᱫvஹᔣx"#ḄoIqyᵨᜐ{|⊝~᝱᪷mnSᑮḄᔠ*Mᓽ>mnḄᱫvᑭᵨP=:=?=Fumnh_Ḅ᳛8WᙠChC(4)ᑭᵨ4=?x100%=—^ߟx100%=¡fx100%ᱥ,]ᐰjGQ☢lWg(G+Gh)"G+Gh!_`ᦔ᳛஺¢⚪ὃ¥¦/0§I0§ஹ¨©ª«¬ᳮஹV§ஹ!_`ᦔ᳛§ஹ!"#o§ஹ᳛§Ḅ®ᔠ¯ᵨM°±ᨵᵨIgO\²±*mnḄᱫvᐵ´஺µ28⚓ᐳ30⚓

2829.ூᫀ௃ᵫᵯ»¼ᔠGᐵ5,RYᡡÀὶᵯÂ⊤Ä&ÆÇḄᵯÂ஺(1)ÉÊËᘤÍSḄÂON>ᵯÂ⊤ḄÐᦪ1ᓃᵫÒÂÊËᘤḄqÓR=300,CÀὶᵯ»RᔜᜐḄᵯ×LMᡠOᵯ»RḄᵯ×/=*=hCÀὶᵯ»RgᵯqM{ᔜᑖᵯqÙIᡠOᵯÚᵯÂu=/Rg=/(R+&)=614X(30஺+100)=4V8(2)ÉÊËᘤÍSḄÂON>Uáᜐ{âU~᝱SᑮḄUF'=G=40/V,ᵫU=஺ã9ä᣸*Uá᣸GQḄ,BF᣸=*I,஺ஹ௃03kåx௃oN/kg=4X10-3m3=4000cm3,UáDᐭQRḄ0hé=ᱥ="N=8cmHS500cm2ᑣÉQìí0;î8c_>ÊËᘤGïÍSᑮUᩚḄÂ8(3)ÉQì-ᓣᑮ40Ḅ>Uá᣸GQḄ,Bᓃ/=S/ig=500cm2x40cm=2x104cm3=2x10~2m3,UáSᑮḄUöU'=P7gV&=1.0x103kg/m3xION/kgx2x10-2m3=200N,ÊËᘤÍSḄÂF=F'-G=200N-40/V=160N,ffᵫÒÂÊËᘤḄqÓR'=100,>ᵯ»RḄᵯ×'=ø=»ú=ûû=02ᑣ>ᵯÂ⊤ḄÐᦪ%'=I'R=0.2Ax1012=2Ko0(1)ᵯÚᵯÂ4H(2)8c7஻;ᘤᑮᩚḄ(3)ᓣᑮ4(kro&'(ᘤ'(&ᑣ*ᵯ⊤Ḅ-ᦪ/2ᓃூ2᪆௃ᵫᵯ6789&:ᔠᐵS,RAᡡCὶ&ᵯ⊤ER஺GHḄᵯ஺(1)ᘤḄON&ᵯ⊤Ḅ-ᦪ1ᓃ᪷M7NOPᘤḄQR&᪷MCὶᵯ6ḄᵯSᱯUVWXYZ[Pᵯ6\ḄᵯS&ᑭᵨᵯQḄCὶVWXYZ[Pᵯ_ᵯ(2)ᘤḄON&`ᜐbcd᝱&ᑮḄVfgḄhij,

29᪷M/=Pmg஺n[P`᣸Ḅpq&ᑭᵨ1/=sh[P`rᐭ\Ḅt&uvwPxᫀবᓣᑮ40Ḅ&᪷MU=S/1[P`᣸Ḅpq&ᑭᵨ᜜ᡃ=PNgv᣸PP`ᑮḄ&ᘤḄjbᑮḄ}~fgḄh&᪷M7NOPᘤḄQR&ᑭᵨᵯQḄCὶVWXYZ[P*ᵯ6\ḄᵯS&ᑭᵨWXYZ[P*ᵯ⊤Ḅ-ᦪ஺⚪ὃCὶᵯ6ḄᱯUVWXYZஹᱥpᩩஹᳮḄᔠᵨj&u7\ᨵᵨḄ/ᐵ஺30⚓&ᐳ30⚓