全国Ⅲ卷2020年高考物理真题变式汇编

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50পRW;ফÛ9Üூᫀ௃5m~g8஻rg2m~g12-2ூ௃FṺ¡}¢ᦔ᳛Ẇ¦Ṻ§$bḄ¡hṺ§ᙠ¨〈ªq}~Ḅᐵ«¬᝞Yᡠ/Ḅᱥᳮ°±._`j☢ᑁᨵ´µ¶0=37°Ḅ`f⍝AB,ᐸ$½¾<¿´ij¨〈ª`f⍝ÀÁBh¨〈ªS]ÂÃÄÅᐕÇṺ§ÈÉ.ÊË[\R=0.4mஹÊÍSL=2mḄ¨〈ª#ឤeḄÏ⌮R┐Ê~ÊËᨬÒoᙢ☢Ḅ¡H=2.2m.ÔÕ´ᱥᙽ<ᙠ¨〈ª¡hᜐ☟:;<ᎷÚᱥᙽ`f⍝BÁ}~ᑮI¨〈ªqCoRᜧQᔣQijᔣ½.ÜÝᱥᙽh`f⍝Þ¨〈ªSḄ~᥅àáᦪᙳg=0.5.(sin371=0.6)(1)éh=2.4m,@ᱥᙽᑮIBÁRḄᜧF(2)éᱥᙽAᑮ¨〈ªy¾ᙢ☢@h◤⌕Ḅᩩ(3)ᦋQᱥᙽ;<Ḅ¡h,ᱥᙽ¨〈ªḄDoijᔣ½î@ᱥᙽAᙢoᑮDoḄijxhhḄᐵ«ðh◤⌕Ḅᩩ.ூᫀ௃(1)4m/sF(2)h<3.Omó(3)h>3.6m312-3ூᓣ௃õYᡠ/[\R=2.5mḄ_`öᐝbḄ´ᙊᕜø⍝ᙠBohij☢jbùúij☢ḄyÁdeᨵᵨ´ûrü4ýᑴᡂḄ
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51,L=6mu=4m/sḄ^,⌮e┐ᒴ^<஺ᨵ”=1kgḄ~ᙽ%=10m/sḄ89^,h〈ᔣ89ᔣ஺¢£~ᙽ4〈PḄ<᥅WXᦪ஻=0.3,ᙊB⍝R=1.5m,\M]^,g=10m/s\bc(1)~ᙽ~ᙊB⍝¦X᥅W§¨©Ḅªg(2)«ᑖ᪆~ᙽ~ᙊB⍝&mᔲ®¯ᨬ±C஺(⌕bᨵ³´¯µ)ூᫀ௃প26Jcফ¹º᪆12-5ூẠ௃᝞zᵬᡠ|¼½37஺Ḅ¾☢ᨵR=0.5mஹᙊ¿½À143஺ḄᙊÁᐝ~B⍝4¾☢ÂᑗBᜐ,ᙊÁB⍝Ḅᨬ±C.ᨵ1.0kgḄḄᱥᙽᙠA8PC¾☢ᔣ;

52ூ
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53&!ÒḄ᥅~3êᶍ!ÒÕÝÏᜧFḄìí3È☢&'(☢t(!îï3{|ÝḄCDð=60kg,ÏḄCDM=10kg,ÏᙠÈ☢Õ'(☢l>;ᡠ[Ḅò_5ó_Ḅ0.5ô஺sin37°=0.6,cos37°=0.83glOm/s—û1üᓣ3ÏVÝḄ᥅~_ḄᜧFÕ®ᔣû2üᢱÎPVÝÕÏḄ(ᙳ·ᵨ_ḄᜧF஺ூᫀ௃û1ü10N,È☢ᔣû2ü140N12-10ூᓣ௃|þÝÿᑭᵨ〈ᱥᜐ〈ᑮᜐ஺᝞ᡠ4=6mஹ஺=30°ஹ!⊤☢$%Ḅ〈'ឤ)*᳛ᓃ=4m/s⌮0┐2ᱥ3〈4Ḅ5᥅78ᦪM=;〈<=3>?15°ḄB☢$CDE2ᱥ3B☢4Ḅ5᥅78ᦪ஻2I>JK%=20kgḄᱥOPQR'SᶍUVWᙠ〈Ḅ!=ᱥY〈ZB☢5[B☢\=0*ᜧ^?lm/s஺`g=10m/s2,sin15°=0.25,cosl5°=0.966.hiO1Uᱥ3〈jᑮᐳl*mnᱥopḄqrᜧ^ᓰtO2UB☢Ḅ4Ouvwᶇyqᨵᦔᦪ|UtO3Uᱥᙠ〈!5Ḅp}~ḄKQ஺ூᫀ௃O1U1mtO2U4.5mtO3U120Jூ
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98'()Ḅᵯ*x=vtE_BWMNὶ12ᐭᦪ567᜜/”:;Ḅᐵ=TRB2y2v227CMNᡠ,-./ᜧK>=G=B/y=-^—=0.2sin(ᖴ1)3s)F=BIl=^-R2ᐭᦪ56B7:.max=02N஺MNḄAᜧF-B(2)᦮G'(ḄHIJ᳛ᵨVMNmmRZ[j=0.4\x2,=0.2WᵫMN6O“MN:ᓃWᡂTU஺VWMNX"Ḅ:ᑡR¡R¡]ḄஹḄA:ᑡ]ᵯ_ᓄᑴ"ḄAᡂTU,67ᡠbᵯ_ᑴ"ḄA஺c:ᑡ]ḄVᡂTUᑣᵯl7T_ᑴ"ḄAᜧfᑡ]gᓄh᝞hIᡠk஺ᦑ71ᑍᑍ37c——t=——ᡈpt=---3434᦮G'(ḄHIJ᳛P=0.2WᡠqḄ4411-6ூẠ௃ூᫀ௃(1)1.5Jv(2)1Av(3)1.5Cூ⚪᪆௃zB:(I)ᙠ0~1.0sᑁᵫᵯ67ᵯ"#(3)ᑴ"|})ᑡ],ᑮḄ/ᵫᵯ_ᑴ"ஹᑴ"E=L£=2V_/ᐳ&Ḅ஺ᵫ(2)6Oᵯ_ᑴ"Ḅ/:ᑡ]ᡂTUv_/fḄvᵫ⚪h1᪷ᵫᔠᵯ(Ḅᨵᵯ*Ḅᜧ5[6Oᑡ]ᙠ20m/s3m/s¡;ᡠ◤ᔠ/A5Aᨬᜧ¤¥g஺¦ᔠbMᑖ᪆6Oᑡ]ᙠ3m/s©ªᡠ◤1SᑁᵯḄIᑴ"ᨬ஺11-5ூGூᫀ௃পQ=I-Rt,=1.5J71,3QF=0.2sin2(0¬3s),0.2Nv(2)£=-Sᡈf=-S(2)2s°±Ḅ44ூ⚪᪆௃zB:v=at=2m/s2(1)'()Ḅᵯ"#ᵯ"#ᜧE=ByvE'=BLv=2VR¡¤=2.5C᪷5ᔠᵯ(Ḅ672s²|°±Ḅᵯ*ᜧE'ᵫᔠᵯ(67------=1AR+r(3)1sᑁ²|°±Ḅᵯ₹%==1C°±ᒴX"67°±ᙠ2sᑁḄµ¶ᜧ

99121x=—at=Im%=4.8x10-3c2᪷5ᵯ67ூ⚪᪆௃zBÄf=B—=lV(1)aZJX"ᑮxi=02”ð=2T,ᨵᦔòEt2I=0.3"?2sᑁḄ·ᙳᵯ*ᜧᑣᑗᒘᵯ"#E1=----=0.5AE=B/V=0.3VR+rᵯ*ᑣ2sᑁ²|°±Ḅᵯ₹P/=—=3X10-3A%=/•12=0.5CR(2)জᙠ0.2mmv1ঝᙠ0.4mWxWO.8m¡èᵯ"#32ᐭᦪ5B7E=Blv=-x4v=2m/s²|ᵯḄᵯ*0E3ÇÉᐭÊ),ᑮḄ-./:Ï/ÌÓ☢ᔣÍḄᑖ—=-----xR400ᜧÖ×ØᔣÖÙ7²|ᵯüᘤḄᵯ*mgsin0=BILA‘NFC~^Vbq_CAE_43A==-CV=1.5X10-AArArAr4/=M=ÜR+rR+r-./2ᐭᦪ57Ä+1039F=BL(/dDyBr-x(5x+l)4000¥ᔙ+§=05T\5(3)ᙠ0.2m0.4mḄᵯ(2)᪷5ᔠᵯ(Ḅᨵ4=%=1.2xl(T3c/=^A=2.5AR+rᙠ0.4m

100ூ:⚪<᪆௃?<@A1BCDEFGᵯHIḄᜧKᵫNE=BLv=\NMNḄᵯ&ᜧKE1A=().5AOPPᐵSSTUVḄWXYᑮᨬᜧ(ᐗ]Z_`ḄᵯR+r1.5+0.5bឤdA2BCD_`ḄᵯIaUU=1R=1.5Vm2BLA3BeᢝCDfᒴWgHᡠijḄᔣlḄmn᜜pqNrÇ(®ᵯ%_`ḄᵯbdspḄᜧKU=BLv-UR2mF=F=BIL=0.5x0.5x0.2N=0.05N±EḄᵯ&dூuvwᫀ௃পz{8ফ}{1L10ூᓣA3Ba=—Èᵫµ2ூ:⚪<᪆௃ᑖ᪆@ᐵpz⚪ὃᵯFGஹᔠᵯ<µqᙠὃὃᔠᵯpᜐᳮ⚪3mgRḄp஺A3BPᐵSᔠ,TUVḄWXᨬᜧ(UVÉḄFb⚪᪆z3A1BUVḄ¡pᑖ᪆gHᑖGᵯHId᪆¢£TUVḄjWXd¤(ḄᨬᜧWX8A2B✌E=ᐜGᑖ᪆§¨A1BEḄᵯ&©ªAbBEZᐗ]ḄᵯbY)BLᑮᨬᜧ(Ḅᵯ&ᜧKᐵ¬ᯠS®ᵯ%⊤°£±EḄOPPᐵSḄ´)ᐗ]Z_`Ḅᵯbdᨬᜧᵯ&²³¢£UVḄᨬᜧWX8A3BḄᐵᙠU=MN¢£PᐵOP´)±EḄᵯ&µ£CDᡠ¡Ḅrspm2BLᜧK¶᪷¸¹º»¢£UVḄjWX஺ᑣ®ᵯ%_`Ḅᵯbd?<@AIBᔠPᐵS,UV½¾Ḅ¿E¡ÀÁᔣ½ḄÂpஹÀᵯEḄᵯ&dÁᔣÃḄrspÄᵨTÂp©rspᜧKÆq(UVḄU'RjWXd¤WXᨬᜧᑣRmg=BIJUV¡ᑮḄrspdᵫᵯFGµᐭ=BlLE
=BLvUVᵫ¹º»µ
mg-F=maᵫµA<µ'Ra=&<µ2mgRV.1=]r—rF2t2"ROBI312-1ூẠ௃ூuvwᫀ௃A1BRW5஻72g8m2gA2BᵫAIBµ

101mgsin஺)/jnigcos0=maF2¨2Mg2°hv=2a----Rsin஺ூ⚪᪆௃?<@<µVB=4m/s(1)ÐKᳫÒÓP²ᐭÖ⍝(ḄWXᜧKdᜐᵫHᳮ(2)æçèPDÓWXd¤(êdëµh0=mgh[-/Limgcos0—---஻mgLsin஺Ft=mvQ<µh3.6m(2)KᳫÒQÓmní£SfnígHᨵ12-3ூᓣ௃ூᫀ௃(1)%=5Trn/s(2)7.5N.S;x=vt(3)Ep=56.25J2R=ig/ூ⚪᪆௃()<µ(1)ᙠ+C,ᵫ./0123ᨵ2VcK=mgNR8ᳫ:8<=ᑮC>?@AឤCᨵgrnv^-gmv^+mgR—4R=4Rm-gEᐭᦪHIv=5V5m/sBᓽR=~~=(xᨬᜧ÷8Rg(2)K8ᳫAᑮBᵫ@MAឤ23ᨵF2t21212V--4R=4R—mvA=—tnv^+jumgxmgEᐭᦪH)IøᐭxḄ⊤Yùïµ¾ᙢÓᑮÖ⍝½`PÓḄᨬᜧûèd=15m/s=4R=2ᶭg᪷H=M2ᳮIPQK8ᳫḄRMᜧ8T/=Ap=mv=7.5N•s12-2ூüý௃ூᫀ௃(1)4m/s8(2)h<3.0m@A(3)h>3,6m(3)ᵫV@ᐵXYZCPQPឋ\@]ᓄT8ᳫᙠA+Ḅ=@,ூ⚪᪆௃?<@ᓽ(1)ᱥᙽᵫ☟ᑮBḄP12£1/ab

102ὶd)Imgsin37஺+஻mgcos37஺=ma®)I"=0.5ঞE=56.25JpIfcMUூᫀ௃(1)26Jফo)᪆(2)--2axABটூ⚪᪆௃()ᱥᙽ:3ᑮCC᪷H=@2ᳮI(1)sᙽ:AᑮBḄCᵫ./0123YIt+cos370)=]mv(r——“zMঠ22—/Jing=ma᪷H./0123Iᵫ2%=u+v="8ডv^-vl=2aL)IFN=8NঢIv=8nVs,ᵫB᪷H./0z23YZᱥ{K|⍝Ḅ~T8N,ᔣᔣ.ণூᫀ௃(1)6J(2)0.8m(3)2IC=t§,〈sḄCᵫ2(5/7-2)kg.m/s3%=vtூ⚪᪆௃()Q(1)ᱥᙽាῃᙊ|⍝஺4A8,ᑣ◤Ix=§m,ᑣsᙽ〈aKsḄᱏmg=m—RAx=L+xᑖ᪆8ᱥᙽ:☟ᑮ<=ᑮ4+C᪷H@MAឤᨵIAt=m,ᡠbC¢᥅¤¥¦§Ḅ¨M©ª=:>4+7¬.2/Q=/.itngAx—26JὶdYI(2)sᙽ@ᨬ¯+C,°±²ᜧ8T³,H>?@Aឤ2%=6J3I⌕µᱥᙽាῃᙊ|⍝04A8Cᑣª¶PQ·¸Ḅ—mv^=mgx2R+gmvLPឋ\@T6J஺(2)K8ᱥᙽᑖ▤ºᑖ᪆C:☟ᑮ<=ᑮ〈»¼C+,I%=2m/s,½sᙽ@C+C¾ᨵ᪷H@MAឤᨵ212—mv=E+mgR“8cpmg=m-^~EᐭᦪHCIᓽÀ8=J15m/s,ᵫÁTÂÃᨬ8CᡠbsᙽÄÅÆᨬ¯v=6m/sc+C஺8ᱥᙽ:C+R〈CÇᒴɱ<=Cᑣᨵd1■Ë□■ூᫀ௃(1)0.5(2)8N,ᔣᔣ.117-mvD2--mvc2=-^m8Lூ⚪᪆௃()(1):⚪ÎÏYÐÑᱥᙽ:A+ᑮB+ÇᒴɱÒÓ<=CEᐭᦪHCIᱥᙽᙠB+Ḅ±²vfl=6m/s,:AᑮBÕ±²ᜧ8ÖÁvD=4m/s

1031,,-mv^ju-,mgs+mgR,sᙽ8ᳫõöCõíᱥᙽ±²ᜧ8T,ᵫ=MAឤ2EᐭᦪHCI3Ri=0.8mmv=)aw'+"%%}tÝàᙊḄ|⍝áâT0.8m஺)I(3)ᙠtãḄäåæC8ᱥᙽ:஺+<=ᑮE+C᪷H=@v/=2m/s2ᳮCᨵ(2)ᱥᙽᵫᑮA᪷ᳮᨵEᐭᦪHCIv=4m/sEv=5m/sA8ᱥᙽᑮ³+ÞCç8┴᦬êCëᵨ=M2ᳮCᨵ!ᙽ"#ᳫ%&'Ḅ)*+,-ᑣ1=mv-mvEE4=3(b+ᓃ)48ᱥᙽç᦬êí<=ᑮG+Cëᵨ=@2ᳮCᨵggmvi=mgï[+sin30ñ4=1s8ᱥᙽᙠG+òᑖ᪆Cëᵨ./0123Cᨵᙠ34567〈9):;<,mgsin30=m—X=%RὶdCYIᧅ=3m/=2(V7-2)kg•m/s!ᙽ"7〈9Ḅ>?@5,8┴KᱥᙽḄRMᜧ8T2(-2)kgm/SoAx௃3A-᳝12-7ூᓣ௃ூᫀ௃(i)(=2m/s(2)Q=13.5Jூ⚪᪆௃()=1.5m(1)sᙽmsô〈íC8ᳫõö÷tÒÇᒴɱ<=,!ᙽ"#ᳫ%&CDEᑮ7〈9FGᔣF)ᚁR*+KsᙽC8ᳫõ÷±²±᳛TCᑣ:ø¶æsô8ᳫ,Hᑣ᪷Iᳮõ÷C᪷H=@2ᳮm^gR-fjm.gL=᜛^G_`)஻_f&=0)aᱏv,=4m/st=2s2V,>V,úûᎷᔠᳮ஺ᳫõí±᳛TᡭCK8ᳫ!ᙽᔣF)ᨬᜧNOF-mg2X"ஹ=2nIv=2m/s2%=2m

104x?@5rs7〈9Ḅ?ᙢNOiAx,=vx2t2F=140N12-10ூᓣ௃ூᫀ௃z1{1m|z24.5m|
3120JAx,=12mூ⚪᪆௃}:᦮456᥅Ḅᑁ(1)ᱥ"7〈9ᑮᐳabḄ45ᵫᳮQ=஻z⁐+{12mgsin30°•x,+cos30°-x,=—mv[e=13.5|12-8ூ௃ூᫀ௃(1)4=0.32(2)F=13O7VX=Im(3)W=9Jz2ᱥ"7〈9ᑮᐳabCᙠ7〈9jḄ)45,ூ⚪᪆௃}:11ᵫᳮ79z1{ᵫᳮᨵ஻஻2gS=/஻2U~-5igsin30°zL{-X{-cos30°•
=—gᱏ4=0.32.z2ᵫIᳮᨵ/&=᪷/?^ib=130N.(3)W=-mv2=9J.v2=6m/s2ᱥᙠ¤☢jḄ)45ᵫᳮூὃN௃⚪ὃᳮஹIᳮஹm¡r¢£1112-9ூ௃ூᫀ௃z110N,¦¤☢ᔣj|z2mgsin15°•L-jumgcos15°♦4=—mv2.——mv2i222322140Nூ⚪᪆௃}:L«4.5m2z1uvw§¨᠒jᓣᵫ?uvw᦮«᪷¬®⊝z3{ᱥ"7〈9ᑮᐳabḄ45ᵫIᳮ2T=0.5xM+mgcos37°+M+஻zgsin37mgsin30°-t}+Rngcos30°-t}=mvx-0iT=350Nt=0.5sx?u᪷¬®⊝4567〈9ḄNOT-f=mgs

10531¶=ᕊ*᥅"°±ᔣ>²¦¤☢ᔣ³i/=-10Nᦑ᥅±ᔣ¦¤☢ᔣjM=2mz2uvwZ¤☢⚔Gᑮ"P%'ᵫᳮiCᙠ7〈9jḄ)45ᵫIᳮ

106B┯¹|mgsin30°•tcos30°-t=mv-mv222]C.bᑮcrº»ᓄº½D»¾b¿ÀᑖÂÃ)ĨᦑC┯¹|t2=IsD.cᑮarÅ»ᓄ«ÆD»¾bᓣÇᑖ®ᙳÉᜧᦑDÊË஺4567〈9ḄNO13-3ூÍÎ௃ூ
ᫀ௃ABD“=Ð2ூØ⚪᪆௃}A.஺Ú᝱Ḅº½,p“ᑣᵫᳮÜÝ«ḄÚ᝱±5i¢s=4mPa_Pb2T34n᪷IÑឤÓᨵᡠßQ=,“"gcos30°zS]—᳝{+“Ögcos30°zAj—×-52pb=3paᳮe=»2oj13-1ூàᓣ௃ூ
ᫀ௃BCDூØ⚪᪆௃}P<=3p0AB.᪷ᳮÜÝ«Ý᝱±5ᡠß3P2K_4P2Kp=pb=3pcaZT2ᦑAÊË|iB.45஻ᑮ6¾bᓣÇᑁÉᜧᦑBÊË|C.458ᑮ஺¾b¿ÀᑁÄ#ᓽî஻<(),«ÆÄ#᜜STZÚ᝱1»ᓄᑮÚ᝱2,Ý«ᑁÉáᑖ®ᙳÉë?Ý«m¡U^O,ᑣᵫÃïðÓi¢e<0,ᓽÝáÝ«?᜜m¡ᑁÉáSTÝ«ᔾÃA┯¹BÊ«ñòóÃIᦑC┯¹|Ë|D.ᵫìi¢45s6Ý«r¾ôõᑁD»?᜜m¡C.ᑖ®ᙳÉáᑖÂ&äᘤæḄÉᜧᵫsÝ«º᪷ÃïðÓi¢Ý«ᔾᦈḄÃIrs?᜜mḄ¡½Ä#ᦑiᘤæjᓫN☢ÆjᙠᓫN*+ᑁ¬ᑖÂ&äḄᦑDÊË஺èᦪÄécÊË|ᦑ⌱ABDoD.êÝ«ᵫÚ᝱2^»ᓄᑮÚ᝱1*᜜ë?Ý«m¡"ìí13-4ூᓣ௃ூ
ᫀ௃CD»ᓄÝ«?᜜m¡>r᪷ÃïðÓi¢ᑣÝ«ூ⚪᪆௃óḄÃI"ìí»ᓄᔾᦈḄÃIᜧ#D>rDÊË|E.᪷ᳮÜÝ«ḄÝ᝱±5A.᪷!ᳮ#$%&᝱(=C)*T&CpV=CTTi¢᝞ùìú²ûüýᦪᓽ¾bD»ᵫ⚪þ¢Dᵫ⚪,)PAᓃ=0.ᡠ²ûüýᦪᦑpVḄÿᐜᜧᡠᐜᜧᡠᨵᔾE┯஺ᦑ⌱BCDoᑣᑁ113-2ூ2Ạ௃ூ
ᫀ௃ADL=UBூ⚪᪆௃45678$%ᙠ:A-BḄ<Ḅp-V=>?ᔲAB=AB.H8IJḄᳮ#$%ᑁ1ᵫK8aᑮbAMEᓄ>ᦑ᦮D<$%Ḅ)1Eᓄᑁ1)1Eᓄ⌱⚗NEᑁ1NEᑖPQRᒓTNEᦑAU7

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ᫀ௃AD13-7ூᓣ௃ூ
ᫀ௃BCEூ⚪᪆௃:ூ⚪᪆௃:ABC.yzAY{᪷!|⊝ᩩ$<$%Ḅ_`AA.ᵫ&᝱4ᑮ&᝱8Ḅ<$%%ᜧᑣ$%Y᜜P=஻஺+——¯—\]ᵫ⌲Ṻ$%_`⌲$%bᨵQ>0,,Ryz᠒ᓣ$%Y᜜\]ᨵW<0,᪷!hijH8)^pVḄEᜧᓣᡠ$%ᔾᑁ1ᜧ,kXU=Q+W)^EᓄN78ᓽᑁ1)1NEᦑᦑA┯;AU7BC┯;B.ᵫ&᝱8ᑮ&᝱CḄ<\MEᓄ_`EᜧᡠD.$%ᑖPḄᜧᑖPh)ᶍN$%ᓣ$%ᔾᦈJᑁ1bᦑBU7:ᑁ1MᑖPḄR1$%ᑁ1)1NEᑖP|ᙳR1C.ᵫ&᝱Cᑮ&᝱4Ḅ<%᜜[Y$%\],)1NEᑣ$%)1NEᦑDU7஺pVḄEdeᡠ$%mnJᑁ1,ᦑ⌱AD.ᦑCU7;13-6ூ௃ூ
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108c.BTCḄAM_Eᓄ$%_`NEᦑcU7Þ=337.5KD.A-B-CḄ<de$%ᑁ1ᦑD┯.Y8IJḄᳮ#$%᪷!ᳮ#$%&᝱(᧕^Eᓄᦑ⌱BC.<£áᙶ᪗ᨬᜧÈᐸᨬ஺ᵫ,)^&᝱BÈ®¯ᨬᳮ#$%:AᑮB?M_ᨵ°D4ᑮBMEᓄBᑮCM_Eᓄ.ᓃ=13-9ூẠ௃ூ⚪᪆௃¥ᐭᦪ!)*A.µᨽQR?·¸ᙠ¹%<Ḅº%⚩¼Ḅ5½ᑣQR⌱"=675K⚗AU7(2)ᵫ&᝱Cᑮ&᝱D?M_Eᓄ᜜[Y$%\]ᨵB.$%Yᘤ¿Ḅ_`?ᜧJ$%ᑖPNÀÁÂᘤ¿ÃÄḄ,⌱⚗BU7W=pæᓃH%=25JC.H8IJḄᳮ#$%Å$%MÆÇÈᑁ1NE$᪷!hij•8kᨵ%Y᜜\]᪷!hijH8k)^$%⌕ᔾᦈJ⌱♦u=w+஺⚗c┯¥ᐭᦪ!*D.?ᑖP|ᙳR1Ḅ᪗Ëᑣᱥ%ḄÍᑖPḄ"=25J+75J=100J|ᙳR1Íᜧ⌱⚗DU7஺ூᫀ௃জêঝi14-2ூ௃ᦑ⌱ABD஺o413-10ூẠ௃ூ⚪᪆௃ூ⚪᪆௃জᵫ⚪í)*$%Ḅî&᝱AA.᪷!⚪,)^$%ᙠ1ÏÄM_Eᓄ$%%⌲PAO=PRO+M=3,OJ᜜[Y$%\]ÐÈde$%Y᜜mᦑᓃ஺AAU7B.ᙠ2<$%HÑᓣᦑB┯ᡭñ▀óAô$%\\MEᓄᑣᨵC.$%ᙠ3ÏÄMEᓄ$%%⌲ᜧᦑ$%PA=P஺+°=2p°Y᜜\]$%ᑖP|ᙳR1NEᦑCU7%AKA,ᵫõíὡ8k)*D.ᵫᳮ#$%&᝱(PMVM=P\VAT*V^HÍ஻Íᜧᑣ$%ᙠ&᝱cÈ_`ᨬᜧᦑD┯஺Tᦑ⌱ACoঝ:÷=300Kᓣᑮr,A<Ḅ$%ᵫEᓄᑮMo,_14-1ூẠ௃`AÞ$%\M_Eᓄᵫøᔧ⃬û8k*ூ⚪᪆௃L-k(1),>ḄADÕ?B=>ḄHÖᑖ,ᓽ:DᑮA,ᳮ#$%Mᓃᓃ*EᓄᨵT=800Km=270Kᦑ:800Kᓣᑮ7>900KḄ<$%\MEᓄᵫ,)^:CᑮD,ᳮ#$%M_Eᓄᨵᵫüᳮ8k*Ä=ÛPAPM=TTcDT7¥ᐭᦪ!ᨵ*

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JK~⌱⚗A,$W^=-6(ln6-ln2)xl.013xl02=-61n3xl.O13xlO2B.m⊝kl'48.5cmᜐḄhFᓫḄkᑖJ=-6.680x1()2J'A4A,ᦑᔠk'ᜧe_A,⌱⚗B┯22£>ᑮA$%'0y1Ì᜜᪷5M-W=pWC.m⊝kl'ᡝ6cmᜐḄᜐem⊝klhᑡFḄzJdsᔣᦑᔠzJ'ᦑ⌱⚗C┯M-532M/=1X1.013X10X(6-1)X10-J=5.065X10JD.FG'4cm,⚣᳛'2Hz,ᵫᑣ᦮ú$%ḄÑJV=2fFz'8cm/s,ᓽFz'8cm/s»!Cᙠ[w=W+W+Wl2i0.25sA=2cmᜐḄFr=6cmᜐḄFᑖ=ᐭᦪ5ᑮm⊝kl'x=4cmᜐᜐᔠky=0,⌱⚗D,W=T.654xl()2J$஺ᓽ᜜J-4.654x1()2,4FüᑮA,.3ᦑ⌱ADo᝱UVýþᑁÿ
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1127Bf=3.5s=7Cc¨©Ḅk'877ᦑA,$-஺=—x24=484BC.ᵫ!2!"#U஺ᙠᱏ0.3sCsᔣo)q,sᔣ,ᡠ@cJᙠFjᦑB┯M-ᙠz=0.2sCḄk'r´ᦑB,$C┯M-C.ᵫ!¢#Uª4sC஺,ᙠm⊝klᔣy,sᔣᡠD.^ᕜ&ᑁḄ\]'4^_ᓽ@஻«ᙠrsᔣḄ¬^kl,ᙠᔣm⊝klazus=4A=40cmᦑC,$-ᦑD┯M-D.Fᔣ®c,ᙠᔣ¯q,sᔣ#UᐸQE.ᵫ⚪UFoxq,sᔣz=0.3s¸¹=0.6sᔊ,7,ᦪᐵT°'42_7TTTTT7Ty=10sin(—r+—)cm=10sin(yr+—)cmFᔣ®Ḅ»¼'½ᙠz=0.6sCx=0.9mᜐk4ᦑD┯M஺eFjᦑE,$஺ᦑ⌱AC஺ᦑ⌱ABEo15-4ூẠ௃ூᫀ௃4yqr1.2515-8ூ௃ூᫀ௃BDEூ⚪᪆௃:ூ⚪᪆௃ᵫ!#U¿FḄFG'4m,½¿Fᔣ®᪷bÀᚁA.ᵫ!¢#UZ=0.25sCª,o)q,sᔣuÂ#Ux=3.5mᜐḄ,ᙠᔣyqrsᔣu.᪷F×ḄᐵT#UFoxq,sᔣᦑA┯M-বᵫ⚪ÄUFzv=4m/s,ᑮMḄ»¼'x=5m,ᦑB.FḄzᑮMḄC5':%4,c/v=—=—m/s=2m/sT2—=—s=1.25sv4ᦑB,$-15-5ூẠ௃ூᫀ௃r22c.ᵫ!¢#U!ᵬ<ªÚ[0.75sᑮÉm⊝klூ⚪᪆௃:ᦑc┯MÆᓃÈᑮÉFjḄC5Ê,ËÌᙠ/=0C஺D.m⊝klᙠÛ=3.5mᜐḄתḄÔᐰ,oÍq,sᔣuᦑ¿Fᔣqrsᔣ:ᑣx=3.5mᜐḄḄs]'ফᑖ᪆#UÐ=1.5s,7=2sᵫ⚪!#U¿FḄF2Ýy=-20sin—f(cm)=-20sinR(cm)4G4=4m,ᦑ¿FḄFzP=Z=2m/s-ᦑD,$-TE.f=o.5sCßà[5s,ªuḄ\]'[3]20sᑁaÔᡂ10Èᐰᐸ\]'200cm,ᓽ'2m஺s=10A=200cm=2m15-6ூẠ௃ூᫀ௃bÀᦑE,$஺ூ⚪᪆௃:ᦑ⌱BDE.পফFG15-9ூᓣ௃ூᫀ௃AD-2°஺%=——ã—m=2mூ⚪᪆௃f103A.ᵫsᔣsᔣḄᐵT#UhᑡFḄsSA=11.2m=5—X5ᔣ
ᦑA,$-ᑣåFæS,Z[m⊝klᔣbuèCA,kexqbs,B.ᵫusᔣᔣÀ஺15-7ூ௃ூᫀ௃ABE#ூ⚪᪆௃=2.5Hz,=1.25HzA.᪷h!"#UT=1.2sஹA=1.2m,ᡠ@

113ᦑhᑡFᙠ⍗ëìᑁJíîï~ðñᦑB┯M;C.ᙠ=l.lsChᑡFḄ»¼'x=vt=0.55myᑣᵬᙠt=0CḄFjôᑮMᜐ-ᑣ¢ᙠ/=0C1.05mᜐḄḄ°ôᑮMᜐ,õ¢ᙠr=0CC1.05mᜐḄkᜧe1cm,ᡠ@1=1.1sCkeÛ=0.5mPஹQp4ᑮqrstḄuvᑖx9*Rzᵫ{|ᐵ22ᜐḄMḄkJde1cm,ᦑC┯M-~D.=1.6sChᑡF»¼'ZPOa=60°,ZQOb=30°ZQOP=90°fy=Kt=0.8mP஺஺9Ὺsᵬᔣ®⌴ù^F¢ᔣú⌴^Fᵫsᔣ%=\[1RsᔣḄᐵT#UCkex=0.4mᜐḄNḄsᔣoyqrᔣᦑD,$஺ᐝᙠ4Ḅᐭi=60஺#ᢚr=45஺᪷ᦑ⌱AD,sinzn----414sinr15-10ூẠ௃ூᫀ௃L5]ygூ⚪᪆௃n=——[1]ᵫ!ᵬUüFýḄFG2ᱏ6m,QḄFGW2m,ᵫ2PḄᕜTp=4s,O2UᐝᙠQ4Ḅᐭ945°,᪷ᐝm⌮k#ᢚZp960°,ᵫ{|ᐵ~9Ὺv=~~=1.5m/sTPফᵫᩩ"#ᑣPஹQḄ᪵ᜧ#ᓽQḄᐝᙠᴻẈQ@A*1.5m/s,+஺Ḅᕜ4-.nv3[3]ᵫ2s234MḄ567ᔣ9:y<=7ᔣ#ᑣᐝP4ᑮ”4Ḅ2GP:x

1146z=53°.)஺•¤6P4ᑮᐭ4Ḅ¯°uv9b,ᵫ{|ᐵ~2L2L3bᓽtanr=h1smr=—g2b—1.5mᐭ4ᑮM¯°uv9a#ᵫ{|ᐵ~..¥sinz=——2tan/=—Hᢚ¡gsinia=4mὶgᑣM,Pp4G¯°uv9L=a+h=5.5mᳮN,Pp4G¯°uv9(ii)ᴻẚᑁ¨k2ᐰªḄ«¬9C஺᪷ᢚ=(672+2)m«10.5m¡ᑣ”ஹNp4Guv9sinC=-nLMN=L—L=5.0mA89S,k4ᙠBCr®2#k49B42ᐭᨬᜧঝP4³kḄᐝ´᯿ᑮ¯☢·¸³¹ᐰªḄᐭ9C,ᐸᐭ4ᑮP4Ḅ¯°uv9R,ᑣT-tanCsinC=-ᳮk4ᙠA8r®2#k49A4ஹB42ᐭᨬnᜧg—

115ᵫᐸᢚᐝ˪ᐝ´ᚖs#ᐭi=3O஺#ᢚr=60°,ᵫᢚ¡sinrn=------sin/ᙠA8r#Áᐭᐝ°ÎABr#ᦑᐭØᐭᦪg/=90°-30°=600n=5/3ᙠACr#k᜛=90~=60஺(2)ᐝ¯☢kḄ«¬9C,ᑣᵫ{|ᐵ~sinC=l^n3r+tz=ZA=60°ᑣ³ᐝᙊß³kḄᐝk¯☢Ḅàá9ᙊ#ᐸât9R#ᑣᵫᢚ¡ᨵLsinisinBAD-------n=——=-----2sinrsinatanChᦑãr=a=30°R=6mgᑣn=5/3S=TTR1=367rm216-6ூ௃ூ
ᫀ௃(1)75°Æ(2)45°(2)^ᐝ´F4ᑮ3Cr®G42#ḄFGIIDE,ᦑᐭூ⚪᪆௃fg:y=90஺—a=60஺(1)ᙠ48rᐭ,ᵫᢚ¡sinz«¬Ö×———=nsinrsmC=—=——n3r=30°Øᐭᦪᙠ8C¬☢·¸ᐰªC<60°Áy>C,ᙠ8஺rÚ³¹ᐰª#ÁsinC=-nZEGC=90°-60°=30°,WGE/IFD´GE=FD,Áᐝᙠ4crḄᐭa'=30஺#ᦑᐝ´ÄÛᢚkACr#gC=45°ᵫ{|ᐵ~ECFD=GE=-----------=LZBMN=90°-r=60°ZBW=90°-C=45°tsin4EGC2sin30°ᡠä⚔216-5ூᓣ௃ூ
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1168ᙠëìQḄᐝí8î=-cmïðᐝ´P4ᑮᐝñᡠᵨḄ2G/=ò+ᒹVCᙠr=3.6xlOl0sADqrᐭ=9O°-r2=3O0Ḅ?@nF-6IFF-IA%Ut.-------L,ᓃf--------L23nᓫ⁐ᐝᙠbᴻẈ>ghḄKBᙠᩞᧇ>ḄᐝB

117a,ᢚ஺s=DE+EF=———£6ᓫ⁐ᐝᙠbᴻἩ>Ḅjk?@Cv=—nᡠlᓫ⁐ᐝᙠbᴻm>jkḄnos5Lt=—=pv3c16-9ூ௃ூᫀ௃1ஹᔊv215cmᵫOPᐵR"ூ⚪᪆௃CDEAB4tanCt==—AP31ᐝK᝞$ᡠM"4a=53°%sina=5tanHJJ"OC-BC^a3DEDEDE4"P39=37ஹsm6^=-ᵫᢚ"sinan=------ᵫWA஺=ARNA=60஺%ᑣᐭᐝ஺zAC{ḄᢚsinO%=30஺"ᢚ᳛4n=—3sinzsin45°rrn=------=----------=sinrsin30°2ᐝᙠbᴻ>Z[ᐰ]Ḅ_`C,ᑣᨵ11V2—=-j==—nV22D"C=45°ᵫ$!S%ᓃᐝzAC{ᢚ%ᙠ8C{(Ḅᐭ60஺,2.ᕒ+.☢@¡%ᐝᙠ.☢Z[ᐰ]Ḅ_`ᐝᙠG-Z[ᐰ]%ᵫOPS!S%{OEGbC,ᑣ/{%ᵫWNBFG=60஺%AF=3cm,IBF=AB-AFsinC=-=-n4BF=FGcos60°ᑣFG=12cmtanC=4=ᡠlbᐝᙠbᴻẈ>Ḅg*+EG+GF=l5cmh=%CD=0.65\/7m«1.69mtanC4,16-10ூᓣ௃(1)஻=—v(2)A/ZB0.69m3ᑣ.ᕒ¥Ḅ*+1.69-1=0.69mூ⚪᪆௃CDE1ᐝPBᑮ.☢(Ḅ-O,ᐝK$᝞$ᡠM%ᐭ

118