2020-2021学年衡水某中学八年级下学期期中物理试卷(附答案详解)

《2020-2021学年衡水某中学八年级下学期期中物理试卷(附答案详解)》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

2020-2021
⊝
ᱥᳮᔁᓫ⌱⚪ᜧ⚪ᐳ35⚪ᐳ105.0ᑖ᝞ᡠ“Ớ”ᛛᧇᑁᨵỚ!"#$Ḅ&'()*᪵!"#,-./0'1234ᵨ67(89:!"#.;<ᔣ01ᐭ?@0ᑡBCDEḄA.(Fᨵ9:6!"#-GHIḄJᵨB.(Fᨵ9:6!"#ᜧKLᡲNḄC.(9:O!"#-PGHIḄJᵨD.(9:O!"#-PGᜧKLḄJᵨ2.᝞ᡠᐵRSTUV0ᑡBC-DEḄA.IᦋXYZ<ᕒḄZ<\᝱B.4Z<ᕒᔣ^Z<ḄIḄ_IᱥabC.bcZ<ᕒḄdIᜧRZ<ᕒcbḄdID.Z<ᕒᡚTfghiI3.cjk@lmឋopḄqrs0tBC@-DEḄA.uv6Z<ᕒwxyuzYᑭᵨmឋB.|}~ᐰKshmឋᩭḄᓻC.Ḅᑡ}s0ᩭzḄᜧmឋᜧD.☠6ᐵ)

1A.ᩈᙽ4×cRᙢ☢Z<ḄB.ᩈᙽ4ᡠG᥅ÔIḄÁᔣᔣÍC.È«roi-jiB..<3kgḄ?ᳫ2A-235-3C..BCDᵨḄᛛᧇGHHYD..I?JC8.᝞(Kᩈᙽ4NBOPQ7RST᫏VCWᙠYGᜋᜐ[☟$\᝱^ὶ:^^nj-lA.ᱥ5a`BḄ☟᥅b7cᔣYGᔣ&B.ᱥ54`Beᨵ☟᥅b7C.ᱥ54`BḄ☟᥅b7cᔣYGᔣD.ᩩhijkᑨm9.nᐳp⌕rᜓ⌫D┴vwxy᧕᦬|}~ᴻᐸ᜜⌱(Ḅ9:A..B..

210.ᙠ“⌼”ᵨᙽᜧḄᡂBᙠPᯠᑁᐭ2Ḅᱥ5GG
G:ᙳ¡¢ᙠP☢9᝞(ᡠ*:஺&ᑡ¤k¥¦Ḅ89:A.ᵬᡠ¨Ḅ¢7ᨬᜧB.ªᡠ¨Ḅ¢7ᨬᜧC.«¨ᑮḄ¢7D.«᣸¯PḄ211.<5°±ᩞᧇḄᳫ4ஹBஹC,ᑖµ☟$ᙠ¶ḄP·&¤k¥¦Ḅ89:A.4ᳫᡠ¨Ḅ¢7.¸ᜧ[ᐸ¹º67B.4ᳫᡠ¨Ḅ¢7ᨬᜧC.Cᳫᡠ¨Ḅ¢7.¸[ᐸ¹º67D.Bᳫᡠ¨Ḅ¢7.¸[ᐸ¹º6712.᝞(ᡠ*ᙠ»v¼Ḅ4ஹBQ☢Ḅᱥ5ᵬஹ½ᵬ`4Q☢ḄW¾ᜧ[½`BQ☢ḄW¾஺¿ᙠKᱥ5ÀÁPQMNᑗÃÀᑖᑣᒕÆÀᑖ`AஹBQ☢ḄW¾P/ஹPz'Ḅᐵ89:A.Ç’.¸ᜧ[PjB.P/ᜧ[Pz'C.p/.¸[Pz'D.P/[Pz'13.14.ᐵ[¢7&ᑡ¤k¥¦Ḅ89஺/ឌ஺‖
Q/஺Ì:A.5°ḄÍÎᩈᳫNÏᳫᢗᐭiÑÒḄP☟$ᩈᳫ¨ᑮḄ¢7ÓᜧB.2ḄÍÎᩈᳫNÏᳫᢗᐭiÑÒḄP☟$Ïᳫ¨ᑮḄ¢7ÓᜧC.2ḄÍÎᩈᳫNÏᳫᢗᐭiÑÒḄPÔ☟$Kᳫ¨ᑮḄ¢7D.5°ḄÍÎᩈᳫNÏᳫᢗᐭiÑÒḄPÔ☟$Kᳫ¨ᑮḄ¢714.ᐵ[᝞(ÕÖ×ᐸØÙ¥¦Ḅ89:A.᝞(
ᕒÛḄ%ÜVÝÞᜧ8vwßᜧ¨7☢°±ßᜧW¾

3B.᝞(Ḅàáᜧâã⌼äå&Þ8væ5W¾ç¶Ḅßᜧ±èC.᝞(ᙠPQé☢êëḄì¨ᑮḄ67[ᙢ☢`ḄIᢝ7D.᝞(ïðñòóᑭᵨwᜧôWḄõᵨ15.᝞(ᡠ*5°Ḅ<ᳫ4ஹBஹC,ᑣᡠ¨¢7ᨬᜧḄ89:—⏀ড|ডA.4ᳫB.BᳫC.CᳫD.BᳫNCᳫ16.᝞(ᡠ*öPᕒ÷øùôúᙠûPöPüýþᑮûÿᔢ
᜻ᱯḄᙠᓣ᠒᠒ᜧ஺ᑡᨵᐵḄ!A.ᡠ#Ḅ$%&'(B.Ḅ)*+(C.ᡠ#Ḅ,-(D..ᕒ01Ḅ2ᙠ.3ᡠ#Ḅ,-(

417.ᡃ678Ẇ:;<Ḅ=>?@ᩞᧇᔜ⚗ឋ*ᙳGᑮ6▭ᐜKLᐸNOPḄQᑖS,ᑡᐵU>?@ᩞᧇḄ!A.>?@ᩞᧇḄVWXᜧNOXᜧB.ᨵYZ%[Ḅ\]^_ᘤabᑖcᵨ>?@ᩞᧇePᑴᡂhiḄVWjk1l4C.ᵨ>?@ᩞᧇᑴᡂḄ^_ᘤabᙠᙢᳫḄVW⌕jᙠᨴᳫḄVWᜧD.>?@ᩞᧇ〉ᔠᑴsᡭuḄv┴18.᝞yᡠzᵬஹ}Y~ᐰḄᑖcᨵVWZḄ$%஺Y$☢$%Ḅ&'Ḅ!A.PுB.P/

5B.Ìᙽ᣸¡Ḅ%[1.6X10-33nlC.ÌᙽḄNO2.5x103kg/m3D.ᵫÏ\»ᦪÆË
ḄУlF,=6᣸22.ᐵU&'e,-ÄÑḄÒᵨᑡḄ!A..ᐭḄ.‷.XÕᡠ#,-e&'XᜧB.ᵨNOÁÀW($%ḄNO3hᡠ#ᑮḄ,-(ḄC.ÖØÙÚÛᐭᜧÜ᣸WÝÞD.ßḄaà⌕jaáḄâã²äå#æᜧḄ&23.ᙠ᝞yᡠzḄᡲèéᑭ\»ᑡḄ!3Li[R_A.ᙠÜëìᜐíÏ\»ᑁ᜜ðñ$☢ìOòóᜧU<⊡760mm760mmB.Ï\»õᵨZᦔ÷øḄẆùúAjh7|1Jτc._û&ÁüᑭᵨÏýᳮíᡂḄUIJ1__IabcD.±kᜧ&*ÿᢝ7607nmḄᡠᙠa24.ᐵᩩḄᵨᑡ┯Ḅ!"A.#%&'(ᐭᜧ+,-ᑮḄ/012⌕456B.7‷☠ᦋ0;<-ᑮḄ/ᩭ>?4@7ḄC.ABCᵨᩭDEF2ABḄGᘤABC4ᡠ᪗ḄABJ;4KLᩭLᜧD.2MஹOPQRᵨḄSTᳫVᙠWXYZ[STᳫᐙḄ]^_ᘤ`SK2abcḄSWT25.ᙠdefghijᙠ+k6000lḄWWᢗno8ᔴḄqrstuvᐷᡊy᝞{஺WᢗᩭḄᡊyᙠ}▤[v5ᒴᣵᔣᙢ☢஺ᑡḄ!"A.vᐷᡊy‧}ᙠᔣᔣRᵫᡊy-ᑮឋḄᵨB.}▤ᒴḄ¡V¢ឤ

6C.Wᢗᡊy}¥Xᙠ¦BXYᑣXḄ¨V©Wᢗª«D.vᐷᡊy%‧ᑮᙢ☢Ḅ᦮n/®¯4.8x107ᯖ26.±ᨵF2Ḅᙊ´µᘤ¶·☢4᝞{ᵬᡠ¹ᵨº»¼5n[GḄ½¾ᳫ¿½¾ᳫÀÁᙠF2º»Â½¾ᳫḄÃ/[&µᘤ·☢ḄÅ/[Æ2Ç¿º»Èɽ¾ᳫᑮµᘤÊË᝞{Ìᡠ¹µᘤʽ¾ᳫḄᢝ/[Æ3,µᘤ·☢ḄÅ/[Æ4,ᑣᑡᑨÉḄ!"A.F[>F3B.Æ2!ÎC.G>F4D.G=&+F327.᝞{ÏÐYḄ5ÑÒᐹᢣÕ▨×஺ØÒᐹÙÚᨵÛÜḄÝÞ,ÝÞᕜáᵨABâᜧḄ½¾ᑴᡂåXæᵨᢣÕçèÝ}éRXê91æ▨×ëᙠᢣÕ4&,ÙìR஺ᑡᑖ᪆Ḅ!"A.Xæ]éR}ïìZ[/ᦋ0ᱥ2ḄRñ᝱B.ÝÞᑁÚÛÜᨵᑭõᜧ᥅÷C.Xæì0᠒,ᐸឋḄᜧ«¿0«D.▨×ÂᢣÕḄÅ/@ᢣÕÂ▨×Ḅᢝ/5Â⊝/28.ûyn⌕ḄüýþᐹᐵûyḄḄ!"A.ûyÿᯠ
ᔣ᎔ᑮឋḄᵨB.ᙠḄᒴ!ᱫ#$ᜧ&'$C.()*Ḅ+,-./01.ᜧ2ᙢ☢Ḅ0$5☟7ᜧD.ᵨ$8ᑷᵨ:ᜧ0$Ḅ*;ᩭ:ᜧ᥅>29.?ᙽẈBஹDBஹEBᙠFᙢ☢᝞HᡠJᐵ&Ẉ2ᙢ☢Ḅ0$L01ḄM;NOPḄQRA.B0$ᨬᜧ01ᨬTB.DB0$ᨬT01ᨬᜧC.EB0$ᨬᜧ01UᨬᜧD.VWB;0$?᪵ᜧEB01ᨬᜧ30.YZ[☢\]^Ḅᙊ`abᘤᑖefᨵᵬiYW]jḄklmYZn|-0_|—ᐰqjḄTᳫᑖesᐭuYWklNTᳫ☟7Ḅvw᝞HᡠJxYk☢yz{஺}muYTᳫ~klNᑣkl2bᘤ[Ḅ01.....

7ḄᓄஹḄᜧTᐵQRA.PkPzB.?^&4iC.APkᜧ&APZD.T&C31.᝞H?ᨵ?ᑖFuZQF-RF2[Ḅ01QRA.ᜧB.TC.]D.;P32.ᑡ$ḄNOPḄQRA.Tᳫᙠ+N¡Ḅ.ᩭ./$¢ᦋᱥlḄ¥¦᝱B.¨ᵨ$©©$T&᥅>$C.Tª~«¬(«®ᑮឋḄᵨD.¯°☟7ᙠ±²¯°³ᨵ$Ḅᵨ33.ᑡ´&«᥅>Ḅµ¶QRA.(!NḄ(Ḅ·¸ᙢ☢¹Ḅ᥅>B.☟7ᙠ☢Ḅᱥl¸☢¹Ḅ᥅>C.>º»º»>ᑮḄ᥅>D.ᙠᙢ¼Ḅᙊᩈ¾ᑮḄ᥅>34.᝞HᡠJT¿ᵨF©$©☟7ᙠFᙢ☢ḄÀ¶ÁÀ¶ᓾ³ᨵ¥஺ᑡM;OPḄQRA.À¶³ᨵ¥xÀ¶ᡠ©$T&À¶ᡠ᥅>$B.À¶ᡠÃ$Lᙢ☢2À¶Ḅᢝ$?2qÅᵨ$C.ᙢ☢2À¶Ḅᢝ$LÀ¶2ᙢ☢Ḅ0$?2⊝$D.À¶xᙠF*ᔣLÇ*ᔣᑮḄᔠ$ᙳÊ35.ᙠËÌÍ$ÎÏᢞ?ZÑÒTᳫËÌÍ$ÎḄJᦪ9N.ÑÒTᳫs³ᙠÔÕ0.8x103/^/Ö3Ḅ×NËÌÍ$ÎḄJᦪ5N,ᑡM;OPḄQRA.TᳫᑮḄØ$5NB.TᳫḄÙ0.5kgC.TᳫḄl\5xICT3D.TᳫḄÔÕ1x103kg/m37n

8ÚஹÛ⌱⚪Q°ᜧ⚪ᐳ4T⚪ᐳ12.0ᑖR36.᝞HᡠJåZl\qjæᩞᧇ]jḄᳫᵬஹiஹéஹêᑖe☟7ᙠFNḄ]jëÕᜐ஺¢M;OPḄQRA.ᵬᳫḄÔÕᨬTB.ᵬᳫᡠḄØ$ᨬᜧC.êᳫᑮFḄ01ᨬTD.éஹêᳫ᣸òFḄÃ$q^37.᝞HᡠJFᙢ☢BᨵYᑖᙳ`aḄↈõbᘤYᑖḄö÷☢\ᑖeSùஹS2.ÙmḄᩈᳫûüýþ¸bᘤ[qÿ
ᑮḄ7,ᘤḄPo஺ᑡḄA.ᩈᳫḄᨌPoB.ᩈᳫḄ'PoC.)*
+ᩈᳫ☟-./ᘤ0Ḅ12ᓄ47D.)*
+ᩈᳫ☟-./ᘤ0Ḅ12ᓄ46738.:;<ᵬ>
;᥅¦§X¨ᵫ
ᩚ«§஺=1.0x103^9/^3,g=ioN/kg,ᑡḄA.ᱥᙽ4☄®☢¯°/ᙢ☢Ḅ1a8125PaB.²ᓣ³´Ḅµ¶ᦔ᳛ᨬᜧ¹95.2%

9C.»³8.5sF¼*D.᦮Z³´°Ḅᨬᜧ¾᳛225”ÀஹÁÂ⚪Äᜧ⚪ᐳ5⚪ᐳ16.0ᑖ40.ÇÈÈḄ᜜⊤☢XᨵÊËNḄÌÍÎÏ஺CÐÇÈᙠNÑ☢XÒᒴRÓÔᑮNᔣ.500NḄ¤ᑣÇÈḄ×ÔµØÙḄᱫ6N.Ûܵׯ¨ᨵÝÞᱥßញᑷÈᑷÈ.ÇÈâãᔣ¯ÓÔäÇÈᐹᨵ41.᝞dᡠfæçèéêëᔿ³“îᩚ”äÂïðñòḄᙢ¨,1añ஺42.᝞dYZKçḄᘤAᨵKç_`Ḅó_Yôó_ḄᑖõPi>P2,ᵨYöKçḄ£ᑖõuᐭYôó_ᑣYZ£ᡠᑮḄUFiù2Yôó_ḄPi______P2஺43.CZᳫᡠḄJ10N.éOûüᙠᡠ᣸^ḄḄJ20N.ýþᳫûüᑮḄUᜧN,u^ÿ
ᱥ“”“”“”
ᨬᳫḄN஺44.℉Ḅᔣ!ᜧ#$%Ḅ&ᙠ()*+ᜧḄ,-ᜧᑭ/01✌ᐜ45678ᜧ#$%Ḅᦪ:஺⊤=ᜧ#$%Ḅᜧ>?@ABḄCᓄECᓄ,?@ABGA
ᜧ#$%HG⌱“ᜧ”ᡈ“”»LஹNO⚪Qᜧ⚪ᐳ2⚪
ᐳ4.ᑖ45.VWᳫᵨYZᢞᙠ\]ᑁ
(_`a\☟c஺᝞Oᡠ!\fᯠᔣhijߟ►klm
nopqrᳫḄs!-Otuv#w஺46.nᙠOyopzᳫsᑮḄ!-O஺v#w|ᶍtu

10~ஹ⚪(Qᜧ⚪ᐳ2⚪
ᐳ12.0ᑖ)47.᝞Oᡠ!*“m᥅Ḅᜧᨵᐵ”☢$/N᥅/N1ᩈᙽ2.00.42ᙽᩈ2.50.53ᙽṺ2.00.6᪆1ஹ3ᦪpm᥅ᨵᐵ,ᱥᳮḄ0ᙠᱥᡠsᜧᱥḄr
¡¢᝞.("9):/mḄ£ᙳ:¦mᑖ᪆______)¨¥6ᦪ©pm᥅ªᨵᐵ,(N/g)ᱥ10.10999.9ᱥ20.21969.8ᱥ30.3.919.7

11ᙠy
◤⌕6¦ᐹᨵ¯;(k)G¯᥅*0±5²y¨³⌕Ḅᱥᳮ¦
᪷☢¨³µᐵ¶⚪.y8mḄᜧ
·ᵨ¸6u¹º£»ᔣ¼mᩈ½¾lm
ᦪ᝞⊤.ᙠ¿Ày᝞Áᵨ.Ḅº¼mᩈᙽ
ᑣᩈᙽsḄm᥅N.48.=ᑭᵨUÃÄ$%u¯ᨵºḄᜧÅÆᩭÈᑁÉ$%ḄᱯË஺(1)yÈ$%ḄᜧCᓄ*45ÌÍᩭᑨÏḄ஺Ð
%ÑÒ$%uUÃĨÓÔÕºḄABt_Ö
᝞Oᵬᡠ!
ØÙÚÛÜÝ*ᵫaß#⌼ᡂḄ
ØḄâã*(äå/┯è)Ḅ
ᩭḄéN·ê*(ëìíÄ/îjÀÔÕº)஺(2)᣸◀ᦑò
ØëVWóôõaºy
ÑÒ>ḼVWóõᐭºyḄøBùᜧ
UÃĨÓÈ☢ḄABú⌲üCᜧ
᝞Oýᡠ!
ᵫq©þÈᑁÉḄ$%ᨵᐵ஺(3)=ÿᢝ
Ḅ᎔ᐭᤅᒴ᝞ᡠ!஺#$
ஹ&'()*+,-ᙠ/0123Ḅ415ᜧᐸᑁ9Ḅ:)5ᜧḄ;<஺=>?@Ḅ;<(BC/┯F)HIJ஺(4)(KLMNOᜮᙠ/23Ḅ01Q/RUSTU&V2☢ḄX1YZ#K[@\,]ᦋ_`☢abcd&V2☢X1YZ#efK[ḄJA.USᣚᡂeiḄ8.USᣚᵨ41e(Ḅ⏀lC.ᣚ41YeᜧḄ23஺.dOᜮᙠ23Ḅ01fᜧnoᢝQ/pஹqr⚪(tᜧ⚪ᐳ2(⚪ᐳ16.0ᑖ)49.2013w12ᨴ2yzᨌ1R30ᑖ|}~ᨴᳫOᘤ~
Lᓣ.J2007w|}ஹ2010w|}ᡃLḄ3⚩ᨴᳫOᘤJ✌⚩ᨴᳫḼ▮Oᘤ.|}~Ḽ▮ᘤ(᝞ᡠ!)?1.2ᔴN`ᑮ

12ᨴ☢4¢X1R_£¤ᵫ`¦Ḽ▮.Ḽ▮ᨵ¨©ᙊ«¬ᨴᳫ⊤☢®¯°±©ᔾ«Ḅ☢³?2000cm2(g=ION/kg),ᨴᳫḄ´µ¶?ᙢᳫḄ;.¹-O(1)|}~Ḽ▮ᘤº¤ᵫ`¦ᑮ»ᐰḼ▮½¾´µ\,¿ÀÁÂ(2)Ḽ▮ᘤZᨴᳫ⊤☢Ḅ:)¿ᜧÂ(3)Oᘤ¬Ḽ▮ᘤᑖᙠᨴᳫ⊤☢_£ÃÄOᙠ1mÅᑁƽ,37nḄOᘤᙠǽ¾ḄÈᙳÊ1¿ᜧÂ50.᝞ᡠ!JᡃË05ÌXÊ&᪠ÎÏÐJNÑÒÓÔÔÊ1ᨬÖḄ×&᪠ÎÏÐ஺Ø&᪠ÎÏÐḄÙ?2.9X10"g,±ᩩÛܬᙢ☢®¯☢³?2m2,ÝÔᨬᜧ£ÞÊ1?40/cm/A(gß10N//cg)¹-(1)ÎÏÐᙠÝÔàᨬᜧÊ1£Þ0.8km,ᡠᵨḄRáJ¿ÀÂ(2)ÎÏÐ☟ãᙠ☢ÔRäᑮḄ嵿ᜧÂ(3)ÎÏÐæᙠÈᙢ☢ÔZᙢ☢Ḅ:)¿ᜧÂ

13çὃéᫀëì᪆1.éᫀ-Bì᪆-ì-4ஹîï2ðä´µḄbᵨ¬ñòJᔲôõöᐵᦑA┯Fù8ஹdᵨúñòûÔüñýᵫþ᜜ᜧḄᵨᜧᡲḄᦑ8CஹḄᵨᔲ!"#ᐵᦑC┯&஺ஹᵨ(ᡭ"*+᜜ᜧ-.ᙠᵨ0ᔣ0ᐭ345ᯠᑮᜧḄᵨ.ᦑ஺┯&.ᦑ⌱B.(1)ᙢᳫ*Ḅᑗᱥ>ᙠ?@(᎛Bᑮᵨ(2)ᜧCᵫEFᐹᨵIJឋLMNḄᵫOPQᑨSNTUᜧVᙠIWᵨḄXYZ.O⚪ὃ]Iᜧ.ᜧᙠY^NTUḄVᙠIWᵨᱯ`abNTU⌕defghஹfiὃ.2.kᫀmCn᪆mnm4BC.pqrsUtJᕒḄvIwᔣxᑜz{z|}ᔣxḄᵫEᱥ>~Ḅᵨ-ḄOzP{vIw|}ᔣḄᵨz{tJᕒḄEtJᕒ{zḄP஺zḄᦋḄtJ᝱ᡠ43C┯&DqᐝᙠzU(ᦑ஺஺ᦑ⌱mCo(1)ᱥ>{ᱥ>Ḅᵨᱥ>~Ḅᵨ-Ḅ(2)Ḅᵨᦔmᦋᱥ>Ḅᦋᱥ>ḄtJ᝱஺ᐭᳮnḄᭆḄᦔnkO⚪Ḅᐵ஺3.kᫀmCn᪆mnm4ஹ¡¢tJᕒ⌕£¤¥¦§¨©Ḅª«x¬¡¬¡xᵫEឋ®¯tJ°±tJᕒḄᡂ³ᦑA8ஹ´µ¶·¸ᐰº»¼½ញᑷµ(ឋÀᩭḄᓻÃᦑBCஹឋᜧÄᱥ>ḄÅÆᨵᐵᱥ>ḄtJª«#ᐵᑡµឋᜧÈÉÊÅÆᜧª«#ᐵᦑC┯&

14஺ஹËÍᩭᜐEtJ᝱ᓽÐ☠Ò(ᐵÓÔJÕxËᵫEឋÖQ®¯×Ø¥¦§ᦑ஺஺ᦑ⌱mCoឋᱥ>ÙᢝÍᩭtJ᝱ḄឋÅ?@ᱥ>BᨵឋឋᜧÄᱥ>ḄÅÆᨵᐵᔲtJஹᔲஹÛÜÝtJBÞᨵᐵß஺à⚪ὃ]ឋḄáâá⍝ឋḄᭆn⚪Ḅ°n⚪(⌕᪷å^▭ᱥᳮçè×ᑖ᪆ᑨS஺4.kᫀmBn᪆mnmAஹ߸ᐰÀ■ëìᯠ¼ªᡈìᯠᑷµ(ᵫEឋᔣî᎔ðñò■ëឋÀᩭᓻÃᦑᔠ⚪eBஹ´µᑮô(°ᐵÓÔJÕõö´µᵫEឋ®¯ᔣtJ÷L¼ªôᑭᵨឋùᔠ⚪eCஹ´µúûüᜧឋýµᑷµ(ᵫEឋ®¯tJþ᧕⌼ᡂἪ■ᔠ⚪;஺ஹ᧕ᢕᢄ■ឋᩭᓻ#$%ᜮ'ᔠ⚪஺ᦑ⌱*Boᑨ,-./01ᔲᑭᵨ5ឋ6⌕8ᱥ:1ᔲᙠ<./0=ᵫ?@ᢝBᩭCD᝱FḄឋHIJᑭᵨ஺ឋḄKLᙠMN=OᜐQRSTUVRḄ/0ᐸXY1Z[ឋᩭ\ᡂḄ஺5._ᫀ*Ba᪆*a*4ᩈᙽ4ef?ᙢ☢ij@ᢝFᡠl1☟ḄᦑA┯opBஹᩈᙽ4ef?ᩈq1ᔣsCḄtuᡠv᥅xyḄzᔣᔣ{ᦑB|}pCஹ~FᜧᱥᙽyᩈqḄy☢ḄᙳFᡠl᥅xyᜧF,ᑣyᦪFᦑC┯op஺ஹ᥅xyᜧḄt1yḄᜧ☢Ḅᙠᩈqᙢ☢ᙊ¡¢4ᩈqyஹ☢FᦑyᦪFᦑ஺┯o஺ᦑ⌱*B஺£☢Ḅᩈqᙠ¤ᱥ:4ef?ᩈqCᡠlvᑮ᥅xyḄ¦ᵨpᙠ§¨zᔣvᑮḄ~y᥅xye©¨⊝t«᥅xyḄtyᜧ☢ḄFᡠl᥅xyF஺᥅xyḄzᔣ¬ᱥ:efCḄzᔣe®[uf⌱⚗=Ḅ°±⌲.³´a_஺

15u⚪6⌕ὃ¶5f᥅xy·¸ஹᜧḄᑨ,l¹ftḄᳮa஺6._ᫀ*Ca᪆*a*4ஹᳫ¼ᙠ஺ᜐᡠvḄ½y¾ᢝyᜧe¿ஹzᔣe®ஹ¦ᵨᙠÀ.ᱥ:ஹ¦ᵨᙠ.ᩩÂÃ1.f¨⊝yᦑA|}p8ஹf§¨☢Ḅy1Äyᱥ:ÅMÆFIÇMḄᦑ8|}pCஹᑮÈ஺Éᜐ?☟D᝱᝞ËᡠvḄ.ᑗ᜜yYÎᜫ᪷[ÑÒÓ.ÔÕÖ³@ᢝ☟ᦑC┯opD.×ØÙᜧḄᐵÛÜÝÞ☢ḄÀßᵫ☟£àáᙠᩈqÀ.ijḄᩈᙽ´ᩈᙽJàḄâãäåæçQè´éêᦑ஺|}஺ᦑ⌱*Co(1).f¨⊝yëìÀíᔠîïᩩð*ᜧe¿ஹzᔣe®ஹ¦ᵨᙠÀ.ᱥ:ஹ¦ᵨᙠ.ᩩÂÃp(2)e©¦ᵨyḄᩩð*ᜧe¿zᔣe®¦ᵨᙠ.ᩩÂæᵨᙠÀḄᱥ:p(3)᪷[ÑÒÓ.ÔÕᑖ᪆a_p(4)×ØÙᜧḄt1òóàᩈᙽ³ôḄTõᩭ:/ḄᩈᙽÙöCḄâã÷øXùᦔË÷ûü஺ý⚪ὃ¶¨⊝yஹyḄÇMl¹ÑÒÓ.ÔÕḄᵨஹᱥ:ḄÙtḄXù×Ø1.⍝ÿᔠ⚪஺7.ᫀB᪆ᵫḄ0=5N஺Ḅ0.5N,ᨵ!"ḄᦑA┯%&Bஹ3kgḄ'ᳫḄ30N,!")ḄᦑB*+&Cஹ-./ᵨḄᛛᧇ340.05N,ᦑC┯%&Dஹ5'6Ḅ0.05N,ᦑ஺┯%஺ᦑ⌱B஺(1)ᙠ9ᵨ:ᡠḄᜧ=>?!"Ḅ஺(2)@⚪ABᱥDḄᨵᜧEḄ)஺⍝Ḅ9ᵨGᑣ@/IBJKᱥDḄᨵᡠ)LM⚪ḄᐵO஺8.ᫀ4᪆PQRS᝱L☟VS᝱ᡠWᡠᨵXLY⊝Ḅ

16AC,P4Lᜐ]☟VS᝱ḄAR4^3_ᔣḄabc1ஹᢱf@gḄ᥅iᢱfL☟VḄᢱfḄj᥅ikឤL4@ᢱfḄ᥅im]ᢱfḄ_ᔣᔣno"ᩭqᢱf@4Ḅ᥅iᢱfḄ_ᔣᔣr&2ஹ_ᔣᔣr&3ஹB@gḄ᥅i஺vᐳxyz{yzLkឤḄᵫ]1ஹ2a_ᔣXLᔣrḄᡠWB@AḄ᥅i_ᔣLᔣnḄo"ᩭqxL4@BḄ᥅iLᔣrḄᦑA*+C┯%&8ஹ᝞4jB3ᨵ᥅iḄᵫ]a4jᢱfxrᣵx>ᜐ]☟VS᝱)ᦑ8┯%&Dஹnᑖ᪆4L*+Ḅᦑ஺┯%஺ᦑ⌱Ao@nBᱥD4jBaᑖ᪆ᐜ᦮Dᑖ᪆ᓫᑖ᪆᪷Y⊝ᓽ஺⚪ὃY⊝ᩩḄᵨᐵOL@ᱥDaᑖ᪆yL⚪Ḅ஺9.ᫀA᪆ᙠ¡¢:a☢¤¥=¡¦¥ᜧ.ᵫ⚪§y¨©⌫/┴ᙠ@¬ᴻḄ¡¢Ḅbcr⌫/┴@¬ᴻḄ®ᵨ☢¤¥=¡¦x¥ᜧ¬ᴻx¥¯᧕±ᡭẚ.⌱⚗ABḄ⌫/┴☢¤ᨬ=ᡠWᙠ¶·¡®ᵨr¸@¬ᴻḄ¡¦LᨬᜧḄ.ᦑ⌱A.ᡭẚ¬ᴻL)¹ᜧ¡¦¹ᜧ¡¦Ḅ_ºᙠ¡¢:»=a☢¤&ᙠa☢¤¢:¹ᜧ¡.¼½¡¦ᜧ=Ḅ¾¿PÀ¼½¹ᜧj»=¡¦Ḅ_º?ᙠ/IBÁWᑭᵨᐙᑖᳮᱥᳮᩭÅ]/Iᵨ]/I.10.ᫀB᪆ÇÈBÉÊËÌᡂḄ=ÏᐭᱥDÑXÒÓᙠÔ☢n=aᑮḄÓm]jÏᐭᱥDḄjPᵨ¶·ḄÉÊËÌᡂ==ᑁÏᐭᱥDḄ¥ᜧ=aᑮḄÓ¥ᜧPGØுG,>G/ᦑØØᡠaḄÓᨬᜧÝᨵ8*+஺ᦑ⌱B஺ᵫÞᩩᔠᱥDÒÓḄGßᑖ᪆஺⚪ὃÒÓḄGßàẠ⚪஺11.ᫀD

17᪆(1)᪷ᱥD᣸åæDḄD¤ᜧ=ᑨèÓ.zᳫḄD¤¶mᵫBCéᐰë᣸åæDḄD¤¶·aᑮḄÓ¶·&4ÒÓᑣzᳫ᣸åÔḄD¤ᐵìV"V=V,PM4ᳫaᑮḄÓᨬ=ᦑ8┯%.ABC(2)4ÒÓBíÓᵫᱥDḄÓëᩩABᳫᡠaḄÓ¢m]ᐸïðᦑA┯%D*+&CrëñCាóôõᳫ>a5ᢝ¶Q]íÓíÓ:Óm]ᦑCᳫᡠaḄÓ>¢=]ᐸïðᦑC┯%.ᦑ⌱D.Þz=ᳫD¤¶·XÏᙠ·æDBᡠaÓø᣸åæDḄD¤᣸åD¤ᜧḄᡠaÓᜧ.᪷ᱥDḄëÓᩩᑨèᱥDḄùÓḄᐵì⚪ὃᱥDḄëÓᩩjúàûüýᳮḄᵨᐵO⍝¾¿Óᜧ=ḄPÀLæDḄþÿᱥ᣸Ḅ.12.ᫀA᪆᪷===ᓩ=஺9!ᑗ#ᵬ%4'☢Ḅᜧ*+%B'☢Ḅ-./0123ᡠ$PᵬP
,ᑗ4567ᒕ9Ḅ/01ᵨ;1+PᵬP
'᪷P=W=>=W=pg1p/;pj஺ᦑ⌱4஺EFGᙢ☢I%ᙢ☢ḄJ*ᱥKJ᪷P=W=>=W=pghᩭᑨOᜧPᐵR஺S⚪U⌕ὃXYᨵᐵḄᜧP[\ᐵ]^_ᑭᵨabcᑗ46ᑖeᒕ96ᑖḄf0/0ᐵR஺13.ᫀC᪆Aஹ☟k7ᩈᳫnoஹpᳫ9q᣸rḄv᣸ᩈ᣸+,■:F/=p'kgv᣸,•••pᳫtᑮḄoJᜧᦑA┯;Bஹ☟k7ᩈᳫno

18tᑮḄoJ"ᩈ=Gy=mᩈg,••pᳫᙠr{9q••tᑮḄoJF+ீG+=21+9,v1nᩈ-m+,5,F6^>F+,ᓽᩈᳫtᑮḄoJ\ᜧᦑ8┯}Cஹᙠr~{☟k7ᩈᳫஹpᳫnotᑮḄoJ*K-.23ᡠtᑮḄoJᜧP23ᦑCE}஺ஹ2ḄᩈᳫpᳫᩈᳫḄKP*pᳫK••☟k7notᑮḄoJ*K•ᩈᳫtᑮḄoJP*pᳫtᑮḄoJᦑ஺┯.ᦑ⌱C.14.ᫀ஺᪆AஹᕒḄᜧᙠJIᜧtJ☢ᩭPᦑA┯}8ஹ-.ᑁ60ᜧᡠᜧ¡⌼Ḅ5£9¤᪵¦§t¨ᜧḄrḄᦑ3┯}Cஹ©ª/«¬I®¯°©ª5☢Ḅ«0[9☢Ḅ«0±©ª5☢tᑮḄ¯[9☢tᑮḄ¯Pᡠᜧ¯%©ªᨵ²ᔣ5ᡲḄJµI©ª%ᙢ☢ḄJ*ᐸKJ4ᡲJᙢ☢%·Ḅ¸ᢝJ*ᐸJᡠᙠr'º☢5/«¬Ḅ»ªtᑮḄKJ%ᙢ☢%·Ḅ¸ᢝJ¼%'⊝JᦑC┯}஺ஹ¾ᵨ¿ÀÁIÀÁᑁ6Ḅ¯ÂPÀÁᙠ᜜Äᜧ¯ḄÅᵨ9ÆᙠÇ5ᦑ஺E஺ᦑ⌱D஺(1)PḄÈÉᙠJI.ᜧtJ☢ᩭP}ᙠtJ☢IPJᩭP஺(2)ᑁ60ᜧ¤ᛀ5£9ḄU⌕Ë-}(3)ÌJ'⊝ḄᩩÎᜧP2ஹÈᔣ2ÏஹÅᵨᙠᩩÐÑ5ஹÅᵨᙠ²ᱥ5ÒeÒ«ḄᐵRÒ«±ḄᙢÈP஺

19(4)᪷ᜧ¯ḄÕᵨᑖ᪆஺S⚪ḄÖ²Õᵨ×ØÙÙÚᓾᒹÝYK⌕ḄᱥᳮËᳮßᡃáᐵâ஺15.ᫀC᪆23Ḅä²ᳫ4ஹBஹC,ᵫbæä²ᳫçèᙠ{7W᣸A=V᣸B=V᣸c=V,ᵫ*Pr;P⏀9,᪷éo=Pê”ì¦æCᳫᡠtoJᨬᜧ஺ᦑ⌱c஺ðæä²ᳫḄ23ᵫbæä²ᳫçèᙠ{¦᣸ḄᐵRæ⍝Ḅf0ᐵRòᑭᵨóôõöËᳮᑨOᡠtoJḄᜧPᐵR஺S⚪ὃXY÷ø%óôõöËᳮḄùúᵨæ⍝ûᑭᵨrḄf0ᜧ*⏀ýḄf0S⚪Ḅᐵ]஺16.ᫀD᪆Jஹ¯ÿᙠᓣᵫ=஺஺ᡠḄᦑA┯Cஹᙠᓣ᠒᠒ᜧᵫ"#=஺஺$%Ḅ&'()*ᡠḄ#+ᜧᦑc┯Bஹᙠᓣ/01ᡠḄ#+ᜧ23+45ᓣ5'ᜧ678ᡠ9:;<ᜧᦑB┯஺ஹ=ᕒ?@ḄAB8ᵫ"#=஺9Dᙠ=*ᡠḄ#+8ᦑ஺EF஺ᦑ⌱H஺஺(1)᪷MP=pg/iᑖ᪆ᡠḄᓄ(2)ᵫ"#=pXgv᣸ᑖ᪆#+Ḅᓄ(3)\]:;Ḅ^_ᨵ67a5'Hᙠ5'()*67bᜧ:;bᜧᙠ67()*5'bᜧ:;bᜧ஺c⚪ᙠ=ᘤfghὃj$#kᩩmḄnᵨa#+ᜧḄᑨqrᨵ()sᔠឋvwx'8ᜧ஺17.{ᫀHB}᪆H(1)&'~ᱥ6cḄ(ᱯឋᱥ6Ḅஹ᝱a'ᨵᐵ67ஹBஹᐵ(2)ᑭᵨ&'ᐸ67

20(3)67~ᱥcḄ(ឋaᱥḄஹ᝱ஹᐵaᱥᡠᱥ6Ḅᨵᐵ஺(4)ᐸ&'~Ḅ¡ᑖ(ᙠ¢BḄ£¤67¥¦'~Ḅᓝ¨Ὂª8᧕ᢚq®ᘤ¯m°◤⌕ᵨ³᪵Ḅᩞᧇᑴᡂ஺¹⚪9ᡃ»¼½Ẇ¿ÀḄᩞᧇfÁsᔠὃj$ḄᱯÂÃÄᵨ&'ÃᐸÄᵨ67Ãᐸᱯឋ&'ÃᐸᱯឋrÅÆÂ~(⍝sᔠឋ¥Ḅ⚪È஺Aஹ¢ᱥ6(᝱8)&'É¢ᐸ67ᜧᐵᦑA┯;771Ð1,BஹᵫP=7ËHÌ=Íⅸ=ÏÌ(ᓽF=Z=1H4,ᦑBEF;Cஹᵨᩞᧇᑴᡂ¢(Å®ᘤ¯mᙠᙢᳫḄ67aᙠᨴᳫḄ67(᪵ᜧᦑc┯;஺ஹᐸ&'~Ḅ¡ᑖ(ᙠ¢BḄ£¤67¥¦ÙᡭÛḄ3┴⌕Ý&'¥ᜧḄᩞ6ᦑ஺┯஺ᦑ⌱HB஺18.{ᫀHA}᪆H}Hᵫ⚪ßàÉ¢áâ1ᡠãḄḄ67Érᓽm/=4åᵫæåâ~çèḄéàáâ☢É¢ᑣåâ1ᡠãḄB¥ᜧᓽUíî/åᵫP="PᵬP
'^Ḅð'~É¢Ḅᓽñò=2^fPòுPåᡠ9ᵫp=pgPᵬுP
஺ᦑ⌱HAo᪷M⚪ßᵬஹå1Ḅ67ÉrᵫæåáâçèᑣḄB¥ᜧᵫ&'ᑨqàáâ1Ḅ&'ᐵõö᪷Mp=pg/i¥÷àáâøḄᐵõ஺c⚪ὃj$&'aḄÄᵨᐵù~᪷MæËúàὅḄBᐵõ஺19.{ᫀH஺}᪆H}H+ஹüýᩈᙽ
ᙽᙠ᪷ᱥḄᩩᩈᙽᩈᙽḄḄᙽᙽḄᜧḄᦑA"#$8ஹᙠᙽḄ'(᪷ᱥḄᩩᙽ)ᑮḄ+ᙽ)ᑮḄ,+ᦑ8"#$Cஹ./ᱥ0ᜐ☟34᝱ᵫᩈᙽᑣᩈᙽ᣸9ḄḄᩩᙽ᣸9Ḅᩩ᪷:;<=>ᳮ@ABᩈᙽ)ᑮḄ+ᙽ)ᑮḄ+ᦑC"#$

21D-..0ᙠ᪷:;<=>ᳮ@ADEᩈᙽ)ᑮḄ+FG$ᩈᙽHᵫᩈᙽ)ᑮḄ+ᜧᩈᙽ)ᑮḄ,+;ᙽHᵫᙽᑮḄ+ᙽ)ᑮḄ,+;ᦑ஺┯L஺ᦑ⌱BD஺(1)ᱥḄᩩBNḄᱥ᝞PFQுG,P;)Pᱥ,ᱥS$᝞PFG,P;ᱥ,ᱥS$᝞PFT=G,=;=pᱥ,ᱥSV஺(2):;<=>ᳮḄᑁXBᙠNḄᱥ)ᑮḄ++ḄᜧGᱥ᣸9ḄNᡠ)Ḅ,+஺⊤[\BF/=0᣸=0᣸g=p>᣸g,]ᨵ_ᐰN᣸9NaGᱥḄa஺(1)b⚪ὃefghiᱥᩩ:;<=>ᳮḄjklᵨnᵨo◚qᩩ^EazstḄᐵvHb⚪Ḅᐵw$(2)xᱥḄᩩᐵv(PNுPᱥᱥ$PzP{ᱥ$P;=Pᱥ,ᱥV)}~ᳮ஺20.ᫀBB᪆B⚪ᑖ᪆B+H᪷ᙠ}ḄឋᑁḄE)ᑮḄ+ᡂ"ᑴᡂḄ.>8cm,)ᑮ8NḄ+12cm,U8NḄ+4sn,ᡠIN+0.5cm..14cm6cm,IN+0.5cm,Dᡠ)+12N.ᦑ⌱21.ᫀBB᪆Bᙽᡠ)+GᙽᙠḄ,+¡ᙽᙠḄ)ᑮ+Ḅ+᪷+¢\£¤ᙽ᣸9Ḅaᑭᵨ,+¢\£¤ᙽḄ¦ᯠ¨᪷¢\P=ⅉ£¤ᙽḄ஺⚪ὃeᑭᵨ,+ª«£+ᐵwA⍝ᱥᡠ)+Gᱥ᣸9ḄNḄ,+®H᪷+¢\£ᙽḄa஺,®H£ᙽḄ஺A.ᙽᡠ)+¯=G—°=4N—2AN=1.6N,ᦑ4"#;

22°±16NB.ᙽ᣸9ḄaV᣸=2=--------------------------------=1.6X10-%3ᦑB┯L$Pg1.0x10'²³'xlOM✂G4.VC.ᙽḄo=3=g=l0M'4g=2.5X103kg/m3ᦑC"#$Vl.fixlQ-V஺.ᵫµ¶ஹ·@A¸¹Ḅ,+2.2N,¸¹Ḅ,+0.6N,ᑣ᣸9Ḅ,+Gº=2.2N-0.6/V=1.6N,ᵫD
»ᦪ½¤Ḅ¾¿HBᙽᡠ)+G᣸9Ḅ,+ᓽ°=GFᦑ஺"#஺ᦑ⌱B஺22.ᫀBD᪆BB4ஹÁ‷HÃ'ᦋÅÆ,+
ÇÁḄÁᐭḄÁ‷᣸9ḄaÉᵫ:;<=>ᳮ@Aᐸᡠ)+É஺ᦑA┯L$8ஹHᑭᵨËᩩᑴᡂḄ+Gᐸ,+ÉNḄÌᡠ)ᑮḄ+FGᦑ8┯L$CஹÍÏ¿ᙠÐÑÒHÓÑᙳᜐË4᝱)ᑮḄ+0G,+஺᣸GÍEÕᱥḄÖ¦ᡠÏ¿×ØÐÙᐭᜧÓÒH×ᜧÓÙᔣØÐ᣸É஺ᦑC┯L$஺ஹḄÛÜÝḼßḄà³áàᜧᦑâḄãÖ⌕ãåḄæçèé)êᜧḄÛ஺ᦑ஺"#஺ᦑ⌱B஺஺(1)᪷NÛÜᱯ®Á‷Ḅìí>ᳮᑖ᪆$(2)HᑭᵨËᩩᑴᡂḄ+Gᐸ,+$(3)Í᣸GÍÕᱥḄÖ¦$(4)NḄÛÜÝḼßà³áàᜧ஺î⚪ὃeghiÁ‷Ḅ>ᳮஹNÛÜᱯ®ËᩩḄᳮïᵨð;bñòḄὃeÉᜧð;Ạ⚪஺23.ᫀ:B᪆BB+ஹ}õ᪗÷ᜧÛnøᢝú76cniûḄüýÓþÿ
ᜧ஺ᙠᜐ
ᑁ᜜☢760
ᦑA┯!"8ஹᙠᡲ%&ᑭ(
ᑭᵨ*+Ḅ-./ᜧḄ0
1ᵨ23ᦔ567
ᦑ889"

23Cஹ<=>?ᑭᵨᜧ@AᡂC<ḄDEFGHI=*+-ḄJᓄ
LMNḄ<=OPḄJᓄᩭ.RᜧḄ
ST>U⌕Wᑖ?HI=
YZᨵ\
Y]^>
_`ᳮbc
ᦑc┯!"஺ஹ⌕efᴻ(ᐙi
?j2᣸l(Ḅ<"ᦑmni
ᦑ஺┯!஺ᦑ⌱pB஺q⚪ὃtᡲ%&ᑭ
uvw_@.RxyḄz{
?|Ạ⚪஺24.ᫀpB᪆ppAஹᐭᜧḄ(
3
bJ
ᑣbJ
FᜧF
᪷=஺஺"
ᑣ᣸Ḅ\
\⌕¡¢
ᦑA89"Bஹ¤‷¦Zᙠ(§᣸Ḅ\bJ
¨ᑮḄbJ
j2ª«¬
?®ᦋJ°±ḄᩭªḄ
ᦑ8┯!"Cஹ᪷c¡ᱥ\ᙠbc\(
¡/
´_P¶ᡂ·¸
\ḄFᜧ
᣸\Ḅ\
ᡠuF>Ḅº☠¬F0ᜧ
ᦑC89"஺ஹ¼ᳫ(ᐙḄ?¾¿Àᘤ¼L\ÃÄḄ¼<
LÅF᜜Æ<F
ª2<(ÇÈ
ᦑ£Ê89஺ᦑ⌱pB஺(1)ᐭᜧ
bJ
᪷=pgᓃÑ᪆ᔛÓḄJᓄ"(2)¤‷☠®ᦋJ°±Ḅᩭª«¬"(3)F>?ᵨᩭ.R\FḄ.RÕᘤ
bJ
\ḄFᜧ
᣸\Ḅ\
Lᑨ×F>ºḄᱯÙ"(4)¼ᳫ(ᐙḄ?¾¿Àᘤ¼L\ÃÄḄ¼<
LÅF᜜Æ<F
Lª<(ÇÈ஺q⚪ὃt2ᱥ\ḄᩩÛ«Ü|ÝÞ`ᳮḄmᵨ
ßbᜧ஺25.ᫀ:C᪆pp4ஹâᐷᡊåæç‧éᙠêëᔣíᔣîïð
S?ᵫᡊåᐹᨵóឋ
óឋ?¡Tឋõ
bö÷¨ᑮóឋḄøᵨ
ᦑA┯!"8ஹé▤úᒴü¬ýḄ(
ðöbJ

þö
çÿ
ᦑB┯

24CஹᢗᡊᙠᵫḄ
ᦑḄ!"ᢗ#
ᦑC$%஺ஹ&ᐷᡊ()‧ᑮᙢ☢Ḅ᦮/012345678W=Gh=mgh=8000kgxION/kgx6000m=4.8xIO8/,ᦑ஺┯஺ᦑ⌱8Co(1);<ᱥ>?ᨵAឋAឋCDEឋFCDEGᵨ(2)IJKL!ḄLKMNஹᨵᐵ34!Mஹᨵᐵ(3)PQ34!ᜧḄSTCL(4)᪷VW=G/iW)3456Ḅᜧ஺X⚪ὃ[PQKஹ!ᜧḄSTஹ6Ḅ\]ஹAឋJ^_`Fᜧ஺26.bᫀ8Bd᪆8d84ஹᵫᵬஹghij^F1=G-F/,F3=G-F/,ᡠl&=o3,ᦑA┯Bஹᵫᵬஹghij^?2=6p+6r+~tF4=G/+G^+G,uGotᡠlF"F,ᦑ24B$%Cஹᵫgij^F=G^+G+G,ᡠlG
vᦑC┯4aDஹᵫgij^G=&+otuotᡠl6஺&*o3ᦑ஺┯.ᦑ⌱B.(1)ᑖyzᵬஹghi2Ḅᳫ|}4ᑖ᪆᪷V4Ḅᔠᡂ)&Lo3Ḅᜧ"j^(2)ᵬpᘤz☢Ḅ4Jpᘤஹr>L᣸Ḅ34(t4)Lgpᘤz☢Ḅ4Jpᘤஹr>LᳫḄ34ugpᘤ2ᳫj^ᳫ34Lt4ḄᜧᐵVᑖ᪆ᓽjᑨ(3)gpᘤ2ᳫpᘤz☢Ḅ4Jpᘤஹr>LᳫḄ34Vᑖ᪆ᓽjᑨ(4)gpᘤ2ᳫᳫḄ34Jᡠ}t4Lᢝ4L"otLFiḄᜧᐵᓽj|ᑨ.⚪ὃ[ᱥ>tᩩzᵬஹghi2Ḅᳫஹpᘤz☢Ḅ4|$%Ḅ}4ᑖ᪆᪷V4Ḅᔠᡂ)ᔜ/4ḄᜧCdb⚪Ḅᐵ.27.bᫀ8Ad᪆8d8AஹKCS74ᦋᱥ>ḄK᝱ᦑA$%

258ஹ¢£ᑁᨵ¥¦§K᥅©7¥K᥅©ᨵᑭ
᥅©ᦑB┯CஹᙠK012ᵫ}ᑮ«4GᵨᡠlḄN᠒AឋᜧMᱥ>ḄᨵᐵᡠlḄAឋFᦑC┯஺ஹ▨¯zᢣ±Ḅ4Lᢣ±z▨¯Ḅᢝ4GᵨᙠF²Ḅᱥ>³FCDz⊝4ᦑ஺┯஺ᦑ⌱82஺(1)4jlᦋᱥ>ḄK᝱(2)ᙠ²Jµ¶·¥K᥅©§K᥅©(3)AឋᜧMᱥ>ḄᨵᐵMKN¸ᐵ(4)Dz⊝4¹ºᜧ»Jஹ¼ᔣ»¾ஹGᵨᙠ²D¿À³ஹGᵨᙠ²Dᱥ>³஺X⚪lÁÂÃÄ៉ḄÆᢣ▨¯7ᑁpὃ[4Á^_ᙠᐸ2ḄÈᵨ>ÉᱥᳮMË▭ḄὶÎÁÂÃḄÁÏᐶÑ஺28.bᫀ8Dd᪆8d84ஹÒÓᯠÕKÖ×ØÙᔣÚ᎔CS7×ØᐹᨵAឋAឋFC4FÝ}ᑮAឋḄGᵨ஺ᦑA┯8ஹÒᙠ¿Þß³ᒴNáÖ•¼ᔣ}ᑮᱫä4L«4S75ᒴN¿ÀK᪷Vå4⊝Ḅ^_ᡠl}ᑮḄ4C⊝4ᓽᱫä4J«4஺ᦑ8┯CஹÒᙠæNá012ç³¼èḄéNᜧç·¼èḄéNSuç³¼è>Ḅêç·¼è>ḄêÒ³·¼ᡠ}ᑮḄ4ëìᡂᔣ³Ḅᓣ4(uîÒzᙢ☢Ḅ4ᓽÒzᙢ☢Ḅ4"☟ðÖ஺ᦑC┯஺ஹᵨ4ñᑷCᙠóô☢õö1D÷Öø0ùᜧ4ᩭùᜧ᥅©4ᦑ஺$%஺ᦑ⌱8D஺(1)ᱥ>ûᢝᩭK᝱FḄឋüAឋDᑗᱥ>?ᨵAឋAឋCᱥ>ḄDEþឋ(2)ᜐ
⊝᝱Ḅᱥᑮ
⊝Ḅᵨ(3)ḄᐵᙠᜧḄᙢᙠḄᙢᜧ!"#$%ᡠᑮḄ'(ᡂᔣ$Ḅᓣ,ᙢ☢Ḅ.஺(4)0ᜧ᥅2Ḅ34ᙠ56☢789:#;<0ᜧᩭ0ᜧ᥅2ᙠ#;<0ᜧ56☢Ḅ789:ᩭ0ᜧ᥅2஺>⚪@ᔠὃCDEឋஹ0ᜧ.᥅2Ḅ3ஹHḄᐵஹIJ
⊝ḄKLMNOP⍝@ᔠឋRḄ⚪STUV:WᜧXYZẠNOᓽ]^_`⚪஺29.cᫀ:D

26`᪆4g⚪h⌕ὃCjk,ḄᜧḄᳮ`HXYg⚪ḄᐵmP⌕N⍝ᙠn
☢$,ᙢ☢ḄMᱥopḄq஺᪷s
tஹutஹvtwxt3tyᙠn
ᙢ☢$#Ḅ☢z{ᑭᵨ}~p=9ᓽ]cᫀ஺ᵫ⚪]NẈ
tஹutஹvtᐸ>pḄqWPẈ,ᙢ☢ḄW᪷s}~p=3☢zᜧ஺ẚ
t#Ḅ☢zᨬᜧᨬvt#Ḅ☢zᨬᨬᜧ஺ᦑᨵ஺Ḅ3^_஺ᦑ⌱D஺30.cᫀ:A`᪆4`4ᳫᐰ᪷sH]NMᳫḄqᑣᳫ¡¢£ᘤ¥¦.ḄMᳫḄqᦑ.ḄM§SᵨுS',ᵫ©ª«M]NP
஺ᦑ⌱44஺g⚪ὃCᜧḄ¬R᪷sNᩩ¯ᮣ±⌱ᵨ²³~p=9ᓽ]^_cᫀ஺31.cᫀ4B`᪆4`4´µ¶·¸¹#º»ty#¬nḄU¼WnḄ½:.᪷s}~p=pg¾]Nn,´µ¥¦Ḅ஺ᦑ⌱4Bo᪷s´µ¶·¸¹#º»ty#nḄ½:ᓄ᪷s}~p=pgh]Nn,Àᴻµ¥¦ḄḄᓄ஺>⚪ὃCÂ}~ḄÃᵨᐵmPN⍝nḄ½:ÄÅ´µ¥ᑮÂ☢Ḅᚖ»ÇÈÉḄᓄÊ⌕N⍝ËÌÂᜧḄÍPÂḄÎ:HÂḄ½:஺32.cᫀ44`᪆4`44ஹᳫᙠÏÐ%ÑᩭPᳫᑮqḄᵨ#]IᦋᱥḄÓÔ᝱ᦑA^_஺8ஹÕᵨÖ×ÔPÖ᥅2
⊝஺ᦑB┯Ù஺CஹÚÅÛÜ$o!%ÛPÝᑮqḄᵨ஺ᦑC┯Ù஺

27஺ஹÞ>☟àᙠáâ$PÞ>Ḅqâ☢,ÞḄãᢝ
⊝஺ᦑ஺┯Ù஺ᦑ⌱44஺(1)Ḅᵨᦔæ4]IᦋᱥḄ(HÓÔ᝱஺(2)ᱥᜐ☟à᝱ᡈᒴ»êÓÔ᝱ᑣᱥ
⊝Ḅᵨ஺(3)EឋPᱥ>pḄxឋëWìEឋë¼ᨵᐵ஺(4)
⊝Ḅᩩ¯4ᵨᙠᱥ$ḄᜧMஹᔣíஹᵨᙠ»ê$஺g⚪h⌕ὃCD
⊝ḄKLJ«
⊝ḄÃᵨ#ὃCDḄᵨᦔæ஺33.ᫀC᪆Aஹ!îÐḄo!Ḅïᙢ☢ðḄ᥅2ñòÔ᥅2.Wóᔠ⚪8ஹ☟àᙠ¹☢$Ḅᱥ¹☢ðḄ᥅2ñ☟᥅2.Wóᔠ⚪Cஹ2ôõ#ôõ2ᙠôõ$ÛÔökḄ᥅2ÛÔ᥅2.óᔠ⚪஺ஹᙊᩈùᙠᙢ☢$òÔ#ᑮḄ᥅2PòÔ᥅2.Wóᔠ⚪.ᦑ⌱C.᪷sᱥḄÓÔúûW]᥅2ᑖwx4ýᱥᙠþᱥ⊤☢
Ḅ᥅
᥅ᱥᙠᱥ⊤☢Ḅ᥅᥅ᱥᨵḄ᥅☟᥅."⍝᥅Ḅ$%&'ᑖ)
᥅ஹ᥅+,☟᥅.34.ᫀ:D᪆(1)(4)ᱥᜐ.☟/ᡈᒴ2345᝱7ᑮ9⊝Ḅ;ᵨᔠ>0(2)?;ᵨḄḄᱯABC;ᵨᙠDEḄᱥFᜧHIஹJᔣLஹ;ᵨᙠE34F(3)ᱥᙠ9⊝Ḅ;ᵨMNᜐ.ᜐ.☟/ᡈᒴ2345᝱O9⊝ḄᩩQBCᜧHIஹJᔣLஹ;ᵨᙠEᱥFஹR;ᵨᙠEᩩ34F஺T⚪V⌕ὃYZO9⊝ᩩQḄ[ᵨ,?;ᵨḄ[ᵨ+,᥅ḄJᔣḄᑨ]ᱥD7Ḅ5᝱^_.`ᩭḄ5᝱஺Abcdᨵe79⊝ᙠf9JᔣF7ᑮgh᥅Ḅ;ᵨiB9⊝ᜧHIᦑA┯l

28B.bc7ᑮḄmhᙢ☢bcḄoᢝqᔠO9⊝ḄrᩩQB9⊝ᦑB┯lC.ᙢ☢bcḄoᢝhbcᙢ☢ḄsᜧHIJᔣLE34;ᵨᙠDEḄᱥFB?;ᵨᦑC┯l.bceᜐ.☟/5᝱ᑣᙠf9JᔣFhu3JᔣF7ᑮḄᔠᙳ>wᦑ஺xy஺ᦑ⌱஺35.|ᫀ:C᪆CCᵫ⚪"HᳫḄm>9N,dᙠHᳫ7ᑮḄ>5NᦑHᳫ7ᑮḄ>CF>=G-F=9N-5N=4Nᦑ4┯lGQJVBஹ᪷G=mgHᳫḄCrn=^-=~^—=0.9kg6ᦑB┯lyi-'jiy/K-yCஹ᪷F=஺9HᳫC=▭^^=5x10-4^3ᦑCxy஺ஹHᳫḄ>CP=£==1.8x1஺3/3ᦑ஺┯l஺7nᦑ⌱CCo᪷HᳫḄ7ᑖ᪆m)Hᳫᡠ7ᵨ¡¢£¤`ᳮ¦==Hᳫ஺§᪷G=mg,+,¨©)mh஺T⚪ὃYஹḄª«h¡¢£¤`ᳮḄ[ᵨ¬yᑖ᪆ᱥ7®ᵨ¡¢£¤`ᳮB|e⚪Ḅᐵ°஺36.|ᫀ:AD᪆CCA±>rEᵬஹ³´µ¶I.m·¸¹H.m᪷¨©6=7719=஺9/hF=஺஺ºᑮhmIPV=P»ºᡠ+¼H᣸¾Ḅ¼Hᵫ¿"ᵬᳫ᣸¾fḄᨬHᨬHᦑAxy8.±>rE᪷=஺஺ºᙠE$ᱥᡠ7ᑮḄh᣸¾fḄᨵᐵ᣸¾fḄ¼ᜧᡠ7¼ᜧ±eᵬᳫ᣸¾fḄᨬH7ᑮḄᨬHᦑB┯lC.᪷sÁ¨©P=P஺ÂᙠE$ᱥᡠ7sÁḄᜧHÃÄᨵᐵļÄsÁ¼ᜧᵫ¿"·ᳫḄÄᨬıeᡠ7fḄsÁᨬᜧᦑC┯l;

29D.᪷QF/=G᣸=p;gV᣸,ᙠE$±>rEᡠ+µஹ·ᳫ᣸¾fḄmIᦑ஺xy஺ᦑ⌱CAD.(1)᪷¿ÉᱥḄ5᝱"ᱥ7ᑮÃmḄᐵÊ᪷m¨©ஹ¨©+,¡¢£¤`ᳮ"HᳫḄᜧHᐵÊ(2)ᵫ⚪"rHᳫḄE᪷¿É)rHᳫ᣸¾fḄḄᜧHᐵÊ᪷¡¢£¤`ᳮ)7ᑮḄḄᜧHᐵÊ(3)᪷p=pgÂ"Hᳫ7ᑮfsÁḄᜧHᐵÊ(4)᪷¿É"µஹ·᣸¾fḄ᪷=G^=p^g%"᣸¾fḄmḄᜧHᐵÊ஺T⚪ὃYZÒsÁḄᱯAஹ¡¢£¤`ᳮḄZÃÓÔÕÖ¿)rḄ5᝱hᳫ᣸¾fḄᐵÊBT⚪Ḅᐵ°஺37.|ᫀCAD᪆CC(1)ᩈᳫdᐸ7ᑮu3ᔣFḄஹu3ᔣMḄmhÚcḄᵫ.ᩈᳫᜐ.☟/5᝱79⊝᪷Ḅ9⊝ᩩQCF=G+T=mg+T,ffᩈᳫdº="ᑣ᪷¡¢£¤`ᳮCPogVß=mg+r,ᵫP=£ᩈᳫḄC=ᡠ+pg^—=^ig+T,o1ᩈPå=5ç00ᦑAxy8┯l(2)ë]ì4ᩈᙽ´F$=G=mg,ᑣîᩈᳫ☟/ïðᓄ>C4F/=F/UFM=mg+T—mg=T,᪷¡¢£¤`ᳮ¦=Pòßf☢MóḄô(õᘤF÷Ḅf☢Mó)CøEú5i5ipuffS1ᑣᵫøp=üfõᘤ¹ḄsðᓄC

30F=pS?=p°gÂS2=p°gx-“cS2=,ᦑC┯஺஺Pod^lSiᦑ⌱AD»(1)ᩈᳫᑮᔣḄஹᔣ!Ḅ"#$%Ḅ&᪷(Ḅ)⊝ᩩ,ᑭᵨ/0123ᳮF=஺7஺8##G=mg=pUgᓽ?@AᩈᙽḄCD஺(2)FGHIᩈᙽJ᪷(Jᩩ,@AᩈᳫᡠḄLᓄNᵫPQR᣸T7ḄUVQR@A7☢!XḄYDᯠ[ᑭᵨ\=pS@A^ḄLᓄN஺_⚪aᔠὃd)⊝#/0123ᳮḄeᵨᐵghijklA7☢Ḅ!XYDḄᑨGnopqᡠ^rsᑭᵨ?=25vwᨵrsḄyD஺38.}ᫀABD᪆(1)#ᑁṺ%ḄN#ὅᵬHᐭ7ᙳᙠ7☢ᓽᙠ7JF=Gᱥ,ᡠF=P”஻g,᣸TḄ¢UUVV¤=Fᵬ=F
,ᦑ¥(2)ᙠ7Jᵫ¦§Ḅᩩ,?¨7©pḄ^ᦑ8¥(3)ᵬHᡠªᐭ7Ḅ«D¬ᵫ®=஺஺/1?¨7©pḄ^°¬ᦑC┯஺ᦑ⌱ABD.(1)#ᑁṺ%ḄN#ὅᙠ7JᑮḄஹP±²"஺(2)³᪷(/0123ᳮ?=Gffl=m᣸g=p]gV᣸,ᑨG᣸T¢UḄUVᐵ´¥(3)᪷(¦§Ḅᩩ,ᑖ᪆7©pḄ^¥(4)᪷(¢U^°·¸p=pg/iᑖ᪆7©pḄ^°஺_⚪ὃdº»§©/0123ᳮஹᱥUḄJᩩ,ஹ¢U^°·¸Ḅ½¾#¿ᵨ¨ÀÁÂஹaᔠឋ°ÄPy⚪⌕@ᮣÇ¿ᵨᡠ»¨Àᑖ᪆ᑨG஺39.}ᫀAC᪆(1)ᙊÊËᱥᙽ4ḄUVV=Sh=500x10-4m2xIm=0.05m3,2ᵫ஺=£#6=Ò9?ÓᙊÊËᱥᙽ4Ḅ"

31G=mg=pVg=2.0x103kg/m3x0.05TH3XlON/kg=1000/V,ᱥU᣸T¢UḄUV#±²ḄUVᡠᙊÊËᱥᙽ4ᑮḄF/=p]gV=1.0x103kg/m3x10N/kgx0.05m3=SOON,ᵫj?¨n=2,ᑣÕÖ×$%Ḅ&F=¥(G+GØrF)=,x(1000/V+50N-500/V)=275N,ᱥᙽ4☄A7☢ÚÛ©ᙢ☢Ḅ^G-F=600N-275N=325N,AÛ©ᙢ☢Ḅ^°p=—=—325"=8125PaᦑA¥1S400X10-427n(2)ᱥUÝᐰ☄A7☢$ßḄ&F'=¥(G+GØ)=X(1000W+50/V)=525N,&4$%Ḅ&1000N>750N,ᡠà&4$%Ḅ&=750NÕÖ×$ßḄ&áᑮᨬᜧ$ßḄ&11F"=¸±+GØ)=åX(750/V+50/V)=400N,ÕÖ×ḄᨬᜧÒæᦔ᳛஻=éx100%=êx100%=x100%=ëx100%=-ᑭ”ஹ,x100%=93.7.7.,'\VF"sF"nhnF"2x400JV'&ᦑB┯¥ᱥU4ᑮḄ®=G-4=1000/V-750/V=250N,ᵫ®=pgV᣸_`,ᱥU4᣸T7ḄUVF250N._31V7ᴈ==-------¥———----------=o2.5x10a2m,ìpl.OxlO3kg/m3xlON/kgᵫí=5/1?ÓᱥU4!⊤☢ᡠᜐḄ«Dh=^=2-5xl0-X=0.5m,A&S500x10-/227☢!XḄYD:

32ñh=3=2.5x1஺-2y5óS11000X10-427nᙊÊËᱥᙽ4ᓣḄYDhi=H—h,—h=5m—0.5m—0.25m=4.25m,Aᵫ-=:?Ó$%ö&G◤⌕Ḅø:᦮ªúûÛ&$Ḅᨬᜧü᳛p=F"v=400/Vx0.5m/s=200IV,ᦑ஺┯஺ᦑ⌱ACo(1)þ¨ᙊÊËᱥᙽ4Ḅp☢V#YD᪷(V=S/i@Aᐸ
᪷G=mg=pVgᙊᱥᙽ4Ḅᱥ᣸Ḅ
Ḅ
!᪷"#=pg"ᙊᱥᙽ4%ᑮḄ#ᵫ()*+,-./Ḅᨵᦔ2ᦪ᪷"=4«+68-"#)+,-./Ḅ;ᱥᙽA☄>☢@ABᙢ☢ḄD!EḄFG./Ḅ;ᑭᵨp=JABᙢ☢ḄDK4(2)ᱥNᐰ☄>☢᪷"=4(G+G8).PḄ;ᯠRSTU;4./Ḅ;V./W%Ḅᨬᜧ;STZ;4./Ḅ;ᨬᜧ+,-.PḄ;[ᑮᨬᜧᯠR.PḄ;f,ᑭᵨ஻=^x100%+,-Ḅᨬᜧbcᦔ᳛4ᑭᵨefᱥ4%ᑮḄ#᪷g#=pguiᱥA᣸>Ḅ
ᑭᵨu=s/iᱥ4m⊤☢ᡠᜐḄqrᱥsᓣuv>☢mwḄxrᯠRᙊᱥᙽsᓣḄxr,ᑭᵨ"=:./{;|◤⌕Ḅ;᪷P=:=y=᦮A;.Ḅᨬᜧ᳛஺⚪ὃrஹDKஹ+,-./;ஹbcᦔ᳛ஹᳮஹrஹ᳛Ḅᔠᵨ!Ḅᑨ|2./ᐜ[ᑮᨬᜧ;./|4sᓣḄxr¢ᐵ¤⌕¥¦§¨+,-©ᓣᱥḄªᜧᐸbcᦔ᳛ªx஺40.ᫀ¯ᙠD¨±²³ᜧ´µ☢Ḅ¶·rᩭ³ᜧ᥅º500¼ឋ¾᪆¯¾¯ÀÁÁ,Ḅ᜜⊤☢sᨵÃÄÅÆḄÇÈ¢ÉᙠD¨±²³ᜧ´µ☢Ḅ¶·rᩭ³ᜧ᥅º4ᙠ>ÆÊ☢sËᒴÍÎÏ8ḄÀÁÀÁᙠ>ÆÐᔣs%ᑮÒᱫuÔᵨÕÖ¢Æ⊝ᜧØ!ÀÁ%ᑮḄ>ÆᔣRḄ500NḄÒᑣÀÁḄÛ8bgÜᔣ@Ḅᱫu¢500N஺

33ᑷÁRÀÁÞßᔣ@Ï8¢àÉÀÁᐹᨵ¼ឋâ⌕ãᢝᩭḄÏ8å᝱஺ᦑᫀɯᙠD¨±²³ᜧ´µ☢Ḅ¶·rᩭ³ᜧ᥅º45004¼ឋ஺(1)᥅ºḄèéàêᨵÖᓽᐸVDḄᜧØ´µ☢Ḅ¶·rᨵᐵ²³ᜧDᡈ³ᜧ´µ☢Ḅ¶·rᩭ³ᜧ᥅º4(2)☟îḄᱥᒴÍÎÏ8Ḅᱥ%ᑮÆ⊝ḄÔᵨ᪷Æ⊝ᩩðñòᑨ|஺(3)ᱥãᢝᨵÏ8å᝱ÅôḄឋõö¼ឋ¼ឋ¢ᱥḄ¨÷øឋùúᱥûᐹᨵ¼ឋ஺U⚪ὃ³ᜧ᥅ºḄÐfஹüÆ⊝ᩩðḄᵨýþ¼ឋ!*ÿ஺⚪ᩭḄᜧᳮ▭ὶᙠ!⚪Ḅὃ#Ḅ஺41.(ᫀ*+,᪆*,*.Ḽ0123ᔿ5670123Ḅ859:;ᜧ<=;+>35<ᜧ23?01@ᔣ2ḄBC701DE“Gᩚ”.ᦑ(ᫀK*+஺9L<=9:Ḅᐵ*9:Dᜧ<=D+N9:D+<=Dᜧ஺!⚪ὃ#9L<=O9:ḄᐵP6QRᱥᳮTU6⌕Wὶ▭ஹWYZஹW,[\]ᑭᵨᡠQᱥᳮTUᑖ᪆▭b⚪ḄcC஺42.(ᫀ*=>,᪆*,*ᵫhiO⚪jkTlmnoᙠlpqLrᜐtuv᝱xlmnoḄyCz{ᡠ|ᵫtuᩩ~kTl@noᡠᑮḄuCzᓽ*&=2NᵫhkTno᣸qLḄL+ᵫ"u=P;gv᣸_`=;=\Cᡠ|ᘤᑁqLḄnᜧᓽ*P1>P2஺ᦑ(ᫀK*=N>஺{noᐭlpqLrᜐtuv᝱᪷tuḄᩩ~kTᙠlpqLᡠuCḄᜧ+ᐵNᵫhkTno᣸qLḄᐵ᪷ᳮᑨlpqLnᐵ஺⚪ὃ#ᳮOᱥLtuᩩ~Ḅ¡ᵨᑭᵨ¢ᱥLtuᩩ~£u=G,!¥⚪Ḅᐵ¦஺43.(ᫀ*20N2uN10,᪆*,*ᵫ⚪T+ᳫª«ᙠ¬+ᳫ᣸Ḅ¬yK20N,

34ᵫᳮT*F/=G^=20N,¯Gỏ=ION,F/Gᳫ,ᑣ´µ+ᳫ2uᨬ·tuᙠq☢2uCyCᓽ¹u=G=1ON஺ᦑ(ᫀK*20N2u*10஺T⍝ᱥLᐰ¼ª«ᙠ¬6᣸Ḅ¬ḄyC᪷ᳮkTᱥLᡠḄuC½O+ᳫḄyC¾¿À᪷ᱥLḄuÁᩩ~ÂÃ+ᳫḄv᝱஺⚪ὃ#Q.ᳮḄÄÅOᑭᵨÆÇᱥLḄuÁᩩ~ᩩ~È?Éᜧ஺44.(ᫀ*ÊᚽÌᳫᡲÎÏᑭ+,᪆*,*ÊᚽÌᳫÐᔣÑÒÓiᜧ5<ḄÔᙠxÕÖᜧ஺ᡲÎÏᑭÐ×Éᜧ5<ḄÕ஺ᜧ5<ØÃ;ḄÙḼÚÛḄ]ḄÜ]¯Ý+஺ᦑ⚪(ᫀK*ÊᚽÌᳫᡲÎÏᑭ+஺⌕,(⚪◤ÄÅ*℉àḄÊᚽÌᳫÐOᡲÎÏᑭÐᑖáâãᜧ5<ḄÔᙠO×Éᜧ5<ḄÕ஺⚪ä⌕ὃ#Q.*.ᜧ5<ḄÔᙠ|Ç×å3æḄ,OÄÅ஺45.(ᫀ*,*o85èC!6+ᳫᑮyCOéêḄëCl@CḄìᵨyCḄ3ᔣíîᔣ>ëCḄ3ᔣïéêᔣ2ìᵨᙠ+ᳫḄyðñ+ᳫyðᑖáïíîᔣ>ஹïéêᔣ2òᩩóôᜮḄö÷ᑖáᵨøùGஹF⊤iN,᪆*o85èC+ᳫᙠíî3ᔣ2ᑮyCOéêḄëCl@CḄìᵨyCḄ3ᔣíîᔣ>ëCḄ3ᔣïéêᔣ2஺⚪ὃ#CḄijhḄòæüjCḄìᵨO3ᔣὃìh⚪ὃḄᑁ஺46.(ᫀ*,*85èCþᶍ
ḄᳫᑮḄᵨᳫᩩᜮḄᔣḄᨵᔣᵨG⊤"ᓽ$%ᳫᑮḄ"&%᝞%ᡠ")

35+᪆)-./ᶍ
ḄᳫᑮḄᵨ12ᢥ᯿"&%Ḅ5%ᓽ6.Ḅ"&%✌ᐜ⌕;<Ḅ=⌕>ᜧ@ஹBᔣஹᵨCDᵨᩩᜮḄ⊤"ḄEF⊤"Ḅᜧ@ᜮ⊤"ḄBᔣGCᡈIC⊤"ḄᵨC஺47.Kᫀ)9.8MᜩOMPQR
MSTUᡂWXMᒴZM[\☢^_`FM1ஹ2M0.4+᪆)+)ab◤⌕RUdḄTef2⌕ḄRUgᐹᨵᜩOePQR
Mᑖ᪆1ஹ2jkabᦪ6mno[☢_`Fpᦑ6rostSuᨵᐵMKᫀ$)ᜩOMP
M9.8/w/TUᡂXM⊤TUyḄᙳy$)”||}~9.N/kgMᑖ᪆⊤bᦪ16oSTUᡂWX.ab$Rs᥅Ḅᜧ@ᵨR
OᔣᒴZsᩈᙠ~sS᥅O.ᒴM[\☢^_`FMw/Iஹ2M/w0.4.ᜧ@ᱥTTUḄ◤RUᱥdTe12ᑨ◤⌕Ḅgᐹ)⊤1ᑖS6rᐸOᙳySTUḄᐵMᙠs᥅ᜧSf>ᨵᐵab᪷1⊝ᩩ6᥅Ḅᜧ@Mᑴ¢U5ᑖ᪆᥅Sue\^_`FḄᐵ.£⚪ὃ¦ᡃ¨jḄab©ᒹ«ᘤḄ⌱®ᦪḄᑖ᪆ᑴ¢U5Ḅ¯ᵨOḄ¯ᵨ}°ᔠ²³F〉.48.Kᫀ)Uµ¶Ḅ·☢Ḅ¸F¹┯»¼½¾¿¶·dÀF┯»ÁᨵÂᢝÄÅÆᡠᜐÀFpA+᪆)+)È1ab·du²Ḅᜧ@¢ᓄXÊUµ¶Ḅ·☢Ḅ¸F¹ᩭᑨÌÍB5Î$Ïᣚ5M

36Ñᵨu²
ÒÓÔ᦮Uµ¶u²
ÑÖ×jØÙᴻ¶Ḅ·☢pOMu²
Uµ¶jØÛÜḄ¸Fp}ÝÞu²
jØ·ßᑮḄu²6àáᙠâ-ãäåâ-ᑣ·☢pOḄMᦑ[ᩭḄçèéê붼½¾M(2)ÄÅÆÁᐭḄÀFíᜧUµ¶jØ·☢Ḅ¸F¹⌲ï¢ᜧᡠmᙠ·dðF<·dñÀ·du²ñᜧᡠm·du²ò·dÀFᨵᐵM(3)@²Âᢝó%ÄÅÆḄôõ¢ö÷øùú᎔ᐭüøᤅᒴþ·dḄÀFíᜧðFíᜧUµ¶Ö×·☢¹íᜧÁᨵᑴÀF¢à·du²òðFḄᐵM(4)ᜮᙠ·dḄÀFp᪷1p=pg/i6ÿ
Ḅᜧᜧᡠᙠ“ᣚᜧḄ”U☢Ḅᨬᜧ"”Uᣚᵨ$Ḅ⏀&”U☢Ḅ'ᜧ(“)Uᣚᡂ+Ḅ”,-.☢/0123(415ᜮᙠḄ
7p=pg/i89:;<5ᜮᡠᜐ
ᜧ>ᑮḄᜧU☢Ḅᜧ.ᦑBCD,ᔠ⚪D4Eᔠ⚪D஺ᦑGᫀI"(1)UḄ☢Ḅ(┯L(MNOPQ"(2)
((3)┯L(RᨵTᢝVWXᡠᜐ
((4)4஺(1)Ḅᜧ$YZUḄ☢Ḅᩭ⊤]ᵨᑮ^_ᣚ`(ᵨa8bcᑁeᜧ$.ᵨf✌ᐜi⁚U☢klamᐭU☢ᜧᑁeᜧ஺ᙠ.ᵨaof⌕qrᐸtឋ■wxy((2)(3)ᜧ$z
{ᨵᐵ஺5}z
ᐵ~<ᑴḄ,ᦋ
(5}z<ᑴ
,ᦋḄᜧ$((4)ᜧ$z
{ᨵᐵ஺ᵨa8bcᑁeᜧ$.ᵨf✌ᐜi⁚U☢klamᐭU☢ᜧᑁeᜧ஺᪷7p=pg/iᩭᑖ᪆{ᡈ
Ḅᐵ~ᑨ஺ᜧ$Ḅᑭᵨᑴc`5}ᜧ$Ḅ஺49.Gᫀ""(1)Ḽ▮ᘤḄcm=1.2t=1200kg,ᑣG=mg=1200kgx10N/Kg=12000N(•••ᨴᳫḄMIᙢᳫḄ;.(Ḽ▮ᘤᙠᨴᳫ¡ḄMG'==(X12000/V=2000/V(o66¢ᵫ¤¥Z¦M§w=Gh=2000/Vx4m=8000/((2)Ḽ▮ᘤ/ᨴᳫ⊤☢ḄF=G'=2000N,

37>☢¨S=4x2000cm2=8000cm2=0.8m2p=g==2500Pa((3)vt=Imin=60s,¾¿v=-=—=0.05m/s.t60sG"(1)M^8000/Ḅ§((2)Ḽ▮ᘤ/ᨴᳫ⊤☢ḄI2500Pa((3)5bᘤᙠÄZ¦Ḅkᙳ¿I0.05m/s.᪆"(1)Æ9ḼÇÈÉÊḼ▮ᘤḄc᪷7G=mgÌᙠᨴᳫ¡ḄM(ᑣ¢ᵫ¤¥Z¦MḄ§ᑭᵨ$=G/iaÎ((2)ᐜÌḼ▮ᘤᙠᨴᳫ⊤☢¡Ḅ>☢¨Ḽ▮ᘤᙠᨴᳫ⊤☢¡/ᨴᳫ⊤☢ḄÏÐÑḄMᑭᵨP=5Ì((3)᪷7ÒZḄÓÔ{<Õᑭᵨ"=:Ìkᙳ¿Ḅᜧ$.Ø⚪ὃr§ஹ{¿ḄaÎÛ:⍝ÝẠ⚪ᐵßÛ᪷7ᨴᳫḄMIᙢᳫḄà9⍝ᱥᙠᨴᳫ¡ḄMIᙢᳫ¡ḄMḄâᑖo:.50.Gᫀ""(1)᪷78ãᡠᵨḄ<Õ"t=É=ä3=0.02å(v40km/h(2)æçè☟wᙠê☢¡<ᜐÐëìí᝱>ᑮḄì"F/=G=mg=2.9x104kgxlON/kg=2.9x10sN.(3)æçèñᙠêkᙢ☢¡/ᙢ☢Ḅ"F=G=2.9x105JV,/ᙢ☢Ḅ"p=-=z*஺'=7.25xl()4pa(1S27n2x2G"(1)æçèᙠ÷¡ᨬᜧ¿øù0.8km,ᡠᵨḄ<ÕÛ0.02h"(2)æçè☟wᙠê☢¡<>ᑮḄì2.9x1057V((3)æçèñᙠêkᙢ☢¡/ᙢ☢Ḅ7.25X104Pao᪆"(1)Æ9æçèᙠ÷¡ᨬᜧ¿{ý¦ᑭᵨ"=:aÎ<Õ(

38(2)æçè☟wᙠê☢¡<ᜐÐëìí᝱>ᑮḄì{¢þḄMÏ᪷7ÿ=G=mgᑮḄ(3)ᙠᙢ☢ᙢ☢ḄḄ☢2ᩩ!ᙢ☢"#☢$᪷&p=?ᙢ☢Ḅ'஺)⚪ὃ,-ᱥ/0ᩩ123ஹ'23ஹ5623Ḅ7ᵨᐵ:;<⍝☢ᱥ/ḄḄ஺