北京市某中学2022-2023学年八年级上学期期中物理试卷(含答案)

《北京市某中学2022-2023学年八年级上学期期中物理试卷(含答案)》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。

ᓅ
ᓝ2022-2023ᱥᳮᔁஹᓫ⚗⌱⚪ᑡᔜ⚪ᙳᨵ⌱⚗!ᐸ#ᨵ⌱⚗$ᔠ⚪&஺ᐳ24ᑖ!*⚪2ᑖ+1.2ᑖ+ᙠ-▭ᓫ/ᑴ!12Ḅᓫ/4+A.ᓟ7B.89C.:D.;2.2ᑖ+ᑡ<=>?Ḅ12@AᦋCḄ4+A.DEᑮᰚᓄᡂJKB.ᵨ┴ᜮ᦬ᡭᡂ>ᱏC.〈ᑮᨴᳫD.ᵨUVᑴᡂWXYᡭZᐝ\3.2ᑖ+ᑡ]^_ᨬabc▭Ḅ4+A.deᡂfḄghḄijkl42cmB.AdemnḄojkl8m/sC.AᾭqderstḄuvkl10sD.wxAḄ12kl50kg4.2ᑖ+20191ᨴ3y!“᳝ᐢ}”ᙠᨴᳫ⊤☢Ḅ“}”⍝!ᑮᨴᳫ⊤☢!᝞ᡠ!ᐵ“᳝ᐢ}”Ḅ!ᑡdḄ4
A.ᨴᳫ⊤☢l᯿ᱥ!'‘}”4sḄB.⍝l᯿ᱥ!“᳝ᐢ}”4sḄC.ᨴᳫ⊤☢l᯿ᱥ!“᳝ᐢ}”4☟ḄD.“}”l᯿ᱥ!“᳝ᐢ}”4☟Ḅ5.2ᑖ+᝞!¡d⊤ᱥK¢ᒴo¤¥sḄ4)

1V6.2ᑖ+ᑡdḄ4+A.ᙽẈᑗᡂK©ª«Ḅ¬ᙽ!ẈḄ®jCl¯ᩭḄ±B.²Ḅ®j³´µḄ®jᜧ!⊤²Ḅ12ᜧ´µḄ12C.·Ḅ®j48.9Xl
3kg/m3,⊤In?·Ḅ12l&9Xl
3kgD.®j¸¹Ḅ¬ᱥK!ᐸ12º¸¹7.2ᑖ+᝞ᡠḄ»!¼⌕¾¿ÀᦋCᱥKÁÂḄ4+3A.ÃÄÅÆÇÈ◍ʲᳫᙠѲḄᔾÓsnÔCÕC.ËÌᕒaÎÏᩭḄÐᳫD.sᕒᵨ¿Ä᪗×ᢗÙÚÊ8.2ᑖ+᝞4¹ÛܬtÝ¿Ḅ<Þ஺ßàcáÀâã¿Ḅäᵨᦔæç¿Ḅ+5N3

2A.ᜧᨵᐵB.äᵨèᨵᐵC.éᔣᨵᐵD.ᜧஹéᔣஹäᵨèëᨵᐵ9.2ᑖ+ᑡᐵì¿Ḅ!dḄ4+A.ᱥKíᐭJKu쿸CB.ᙢᳫᔾÓᱥKḄ¿ᜧ!ᱥKᔾÓᙢᳫḄ¿C.ìðºᙠᱥKD.ì¿Ḅéᔣ4ᚖ¤ᙢ☢ᔣ10.2ᑖ+☢4¹òDKóôsuḄõöÞ!ᐸ÷ødḄ4+A.¹òùᙠúö¢úu!úöÝᑮfûDḄì¿äᵨB.ᵨ¿ᡷᩔ᣸ᳫuÿᑮḄᵨḄC.ᳫᢗᳫᯠᑮḄᵨD.Ḅ!ᳫᨬ#$ᑮᙢ☢!ᳫᙠ()*Ḅᵨ11.2ᑖ,᝞.ᡠ020221ᓅ34ᝍ678ᵨḄᐰ:;4K<⍝᤬?@AA“CD”஺GᡃIJKẆMḄAN:O᤬?Pᜓ“CD”R“STU”᦮WᐳYᙠ<⍝7ZSP[ᢈ]᪗_`aᑮ25m/s஺ᙠObcd)⚔fZSᕒOhiaᑮ70km/h,“CD”j*k`lmnZSᕒḄopq`᪷s⌕OஹvOஹwxyS஺zᑡ|})~Ḅ,A.“CD”`OSᐸᨬ:Oh70km/hB.“CD”ᒴO)ᐸZS᝱ᢝ*C.“CD”“STU”ḄY“STU”“CD”*D.“CD”ᙠ<⍝7OZS“CD”“STU”☟12.2ᑖ,᝞.ᡠ0AஹBᐰYḄᘤ.ᨵ*`ᔠḄWWḄ¡hᑖ¢pi£P2¤¥¦pi>p2஺ᔣᘤ)ᑖ¢᎔ᐭWª«᎔¬᎔ᐭ}:1
¯y°±ḄW᎔ᐭA¤2
¯yW²ḄW᎔ᐭB஺P³AᘤḄ´

3°±MA,BᘤḄ´°±MB,ᑣMAஹMBḄᐵ·)B.MAMBD.ᩩº*!»}ᑨ½¾ஹ¿⚗⌱Â⚪zᑡᔜT⚪ᙳᨵÆ⌱⚗ᐸ)Çᔠ⚪ÈḄ⌱⚗ᙳ¿A஺ᐳ6ᑖ,ÊT⚪2ᑖ஺ÊT⚪⌱⚗ᐰ⌱ḄË2ᑖ⌱Ì*ᐰḄË1ᑖᨵ┯⌱Ḅ*Ëᑖ,¿⌱,13.2ᑖ,zᑡᐵÎÏḄ|}~Ḅ)A.¿Ðѱ¯ᙳÒiÓvTÎÏB.ÎÏÔѱ)ÕÖḄ┯ÎC.⌱ᵨסḄѱØᘤiÓvTÎÏD.Ù⌕ÚÛѱÔiÓÜÝÎÏ¿⌱,14.2ᑖ,ᐵOhzᑡ|})~Ḅ)A.Ohxᜧ⊤0ᱥWZSËxB.Ohxᜧ⊤0ᱥWáḄâxãC.Ohxᜧ⊤0ᱥWᡠᵨḄäxåD.Ohxᜧ⊤0ᱥWᓫoäᑁáâxã¿⌱,15.2ᑖ,èéᔣ7êAëGḄTᳫ,Tᳫ7ᓣ£zí«îfḄᵨîTëªᜧT*஺ïTᳫèé7ᓣᑮḄᔠFi,èézíᑮḄᔠF2,zᑡ|})~Ḅ)A.Tᳫ7ᓣᑮḄᔠFi=G+f,ᔣèéᔣzB.F1>F2C.TᳫzíᑮḄᔠF2=G+f,ᔣèéᔣzD.Fl

4217.2ᑖ,᝞.ᡠ0ë10NḄᱥWA☟ᙠÿ☢
ᱥAᑮḄ஺18.5ᑖᑭᔠᑭᵨ᝞ᡠḄ"#$%“'()*+Ḅ,ᙳ./”12஺)34☢5A6ᵫ☟9:;<=ᙠAஹBஹCB6ᙳᨵᵯE⊤GHIᦪKᑖL⊤“HMᑖMN”OPQ<ᑡS⚪:00:00:001V12Ḅ12WᳮY஺212[\]ᑴ4☢Ḅᚁ/`⌱b“ᜧ”ᡈ“”e᪵ghiHI'(Ḅjk஺3)ᙠABmḄ,ᙳ./VAB=m/s»4᝞sᙠ12[tuvᨵwᢝyzᑭ{|)ᙠ}:;~Hᙠ',ᙳ./⌱b“ᜧ”ᡈ“”஺5)ᙠ,☢D64☢A6ᡠḄᔣ⌱b“y”ᡈ“y19.3ᑖ᝞ᡠYᵬஹtᵯ+ᐹ)yHyᔣ3*+ḄHIᓄḄ஺᪷gM1t)ᐰᙳ⌱b“ᒴ.”ᡈ“.”*+஺

52
ᵬ)./)./⌱b“ᜧ”ஹ“”ᡈ“”஺3
1sᑁ)¢ᵬ)£*+mo20.3ᑖ¤ᙠ12¥'(¦§ᙽḄ©/஺¤ᐜᵨ«⁚Ḅᜩ,'(¦§ᙽḄ¯(஺ᜩ,,⊝±²[ᡠ|³ṹµ¶ṹᙠ᪗¸
Ḅ¹#᝞ᵬᡠᑣ¦§ᙽḄ¯(»g.ᯠ¤½¦§ᙽᵨ¾¿|$Àᨵ40mLḄ(Á[(Á[Ḅ☢ᓣÃᑮ᝞ᡠḄ¹#ᑣ¦§ᙽḄÄ»cm3.V¦§ᙽḄ©/<⊤[Ḅ©/y஺ᱥ¯ÅÆ©/p/(kg.rn3)3Ç10.5X103È8.9X103É7.9X103Ê2.7X1021.5ᑖË»Ì'(ÍḄ©/$%Ì᝞<12:

6(1)½ᜩ,|ᙠ,Ð☢
½¶ṹÑᑮ᪗¸ḄÒÓᜐ஺Õ᫡☟9Hᢣ┐ᢣᙠᑖ/²[ÙÓ/ḄÚÛ᝞ᵬᡠ஺»ÜÕ᫡ᙠ,¹#,⊝\½Õ᫡±ÝḄ,⊝ÞßᔣÝÑ+஺(2)½Àᨵ〉(ÍḄáE|ᙠâ«⁚Ḅᜩ,Ú²ᑁ'áEÍḄã¯(mi»128g஺ᯠ½á[ÍḄæçᑖ᎔ᐭ(Á[᝞ᡠᑣ(Á[ÍḄÄV»3cm'o(3)î½ÀᨵᒕðÍḄáE|ᙠᜩ,Ú²ᑁᦋ³ṹḄòᦪ¶ṹḄ¹#Üᜩ,Õ᫡îóᙠ,¹#,⊝ôH±²[³ṹ¯(¶ṹᙠ᪗¸
Ḅ¹#᝞õᡠᑣáEµáᑁᒕðÍḄã¯(m3»go(4)᪷
ö12ᦪ~÷ÍḄ©/p»kg/m\(5)Oûó12ᦪḄüý⊤þ஺22.(4ᑖ)ÿ
ᵨḄẆᔠᡂḄ᝞ᡠ஺✌ᐜ!"#$%&0()*+ᵨ,-./0Ḅ1234AஹBᐳ9:ᔣᔣ#0($0'(1234ᦪᑖ?@FAஹFB஺ABᩭᵨ-./0Ḅ1234CEO(G#Hᑮ0,(1234ᦪ@Fc,MNᡃPQRFcSFAஹFBḄᔠ஺(1)W
,XY!"Z0([#Hᑮ(0'Ḅ\ḄS],XY!"Ḅ_஺(2)aᑭᵨḄᱥᳮefS஺

723.(4ᑖ)ghᵨ1234Ẇ12ḄH&ij#Ḅᐵl34im@0(5N஺ghᐜᵨnop3q1234Y12Ḅ&oᯠ0sṹ⌲-vᢞᙠ1234B᝞ᡠᑖ?yq1234Ḅᦪᵨnopᑖ?3qzX12Ḅ&oᦪ{|}᝞B஺gh~12ḄH&i#ᙠḼ*Ḅ34Bᢞ4NḄᱥ12ḄH&i@cm,ᡠ{ḄSo#/N00.511.522.5312&o3.85.87.89.811.813.815.8/cm12H&i/cm』2山4d5N1N5N2.5N3N24.(6ᑖ)g
ᙠ“ᱥᡠᜧgjiḄᐵl”Nᑖ?ᵨᜩ12343qsṹḄiᡠḄᦪ{|}᝞B஺Bᑡ⚪஺(1)WYḄiS,iS஺(2)᪷{⊤ᦪ{jiḄ@N/kgᐸᱥᳮ¡¢S஺0m/kg0.050.10.150.20.250.3

8G/N0.511.522.533
g£G¤4¥¦ᡂ§᪷{¨3©Ḅᦪ{ªᑴ§᝞ᡠḄG-m¬஺g
~W¬¥®ᨵ°±ᙶ᪗%(஺P´ᦪ{µ¶·᪶~3i|}ᙳº»¼½஺°±¾¿ÀÁÂ0Ãᡂ§ÄBÅÆÇ(ᐸYÈᔠ▭ḄSÊË⌱Íᑏ⌱⚗ÐÑÒÓ஺A.ᱥḄiᓄÕᙳᒴᡠ×B.ØÙ@3iÚᐹÕÜ»ᡠ×C.1234®ᨵ./ᡠ×00.050.10.150.20.250.30.35ÅஹÝÞ▅y⚪Êᐳ4ᑖÓ25.4ᑖÓ▅yàZ“á"ᑮ''ᜩ"ã¥⚪஺Z“á”ᑮ“ᜩ”1970äYåæ⚩è⌼êë“áì”ᡂíᓣïᑮðᜩYåḄñᜩò°ó±§50ôäḄᔊm஺ᙠMö÷ᨴùᡃåñᜩúûü⌼§Ä“,1ë”ஹýèñᜩஹᓅᧅ
ஹᨴᳫஹ⊤ḄᡂᩩஹḄ⍝"஺$ᜩ&'()*+,-ᡃ/Ḅ012ᑡ-Ḅ4ᑖ67▤9᝞⊤1;⊤1▤9⊤>?⌕ᱯC]^_Ḅ`ab<+,CZ-IᐹᨵFGḄᡊᶍJᘤ>?ᱯC+cde?-,LMNឋLPQ<=+,CZ-2CRᵨᨵTUVᑺXRᵨᦪZ[ᑴ“gh”?ᨩᱥlmn

9-2op¤¥ᘤḄ©ª஺⊤2«¬¥ᜩNl®/kg¯⍝°±¤¥v²/km+¥ᕜ´/mincde?pᙢᳫ173¶ᙊ437.7(2057.6110.3¸¹?Apᙢᳫ750ᙊ900102.86¸¹=?Apᙢᳫ1200ᙊ357861440¸¹6?Apᙢᳫ5400ᙊ357861440yzº?¤ᙢᳫ7840ᙊ34391.64{|?ᘤᨴᳫ2350ᙊ200¼127ᜩ½?ᘤ¼5000¶ᙊ280(59000¼2880ᡃ/¾¿}ÀÁᙠÃᜩÄÅÆÇ;“⍒¾ÉᜐËÌ⍝ÉÍÎÏаÑᵫὃÉÍ”⊤ÔÕÖh×ØḄᔣÚ஺Å/Û-Ḅ“ᦑÜ”ஹᨬÝV¥“¤ᜩ”ÞßḄ/²ᙠàáhâ*ḄãäÅåæçḼé᩽ë⌕Ḅì⁐஺Å/Ḅî$ᜩ}ïåᙠẑñò¥óôᧅöÅ/Ḅ¤UᔣᴸøḄhù(1)ᡃ/`Ḅ''ᜩ?"ᘤ]^Ḅ¦(⌱þ“”ᡈ“ᨴᳫ”)Ḅ(2)“”ᙠᙢᳫḄ᝱(⌱“”ᡈ“!”)ᦋ#(3)$%⊤1'()*+,-./0*1,-./23)456(781ᩩᓽ')

10;4
$%⊤2ᡠ=Ḅ>?)@ABC80ᘤᕜF2ᐵḄHI6஺;781ᩩᓽ'KஹMN⚪;ᐳ10ᑖ஺*25ஹ26⚪ᔜ3ᑖ)*27⚪4ᑖK26.3ᑖK1STUᙠVWXYZ[80km/hḄ\ᙳW^_`2h,aTU2h$%ḄYb஺27.3ᑖK1cdeᡠfgh6600N,ᑣjcdeḄkl6mnkg?g=10N/kg
28.4ᑖK1opqrst)Bklu170g,vᙠqdᐜr20gxyzrst)Bklu180g,ᑣxyḄ{^umn|

11ᓅ~*ᓝde2022-2023eZeFFdᱥᳮᔁὃᫀ0⚪᪆1ஹᓫ⚗⌱⚪;ᑡᔜp⚪ᙳᨵ+o⌱⚗)ᐸdᨵ1o⌱⚗ᔠ⚪஺ᐳ24ᑖ)p⚪2ᑖK1.2ᑖKᙠ▭ᓫᑴd)klḄᓫ6;KA.ᓟB.¡¢C.£D.¤ூᑖ᪆௃ᓟ6klḄᓫ¡¢6hḄᓫ£6§^Ḅᓫ¤6¨Ḅᓫ஺ூ௃©ᙠ▭ᓫᑴd)klḄᓫ6ᓟ)ᦑA«¬)BCD┯®஺ᦑ⌱©A஺ூ¯°௃±⚪ὃ²`▭ᓫᑴdklḄᓫ)³´Ạ⚪¶஺2.2ᑖKᑡ·¸d¹ºḄklᦋ#Ḅ6;KA.»¼ᑮᰚᓄᡂÁÂB.ᵨ┴ᜮ᦬ᡭᡂ¹ᱏC.〈ᑮᨴᳫD.ᵨUÊᑴᡂËÌÍᡭÎᐝÐூᑖ᪆௃ᱥÂᡠÑᱥkḄmnÒÓkl)kl6ᱥÂÔÕḄ1Ö³ឋ)!ØÙÚஹ᝱ஹÛÜÝ^Ḅ#ᓄÞ#ᓄ஺ூ௃©Aஹ¹º»¼ᑮᰚᓄᡂÁÂ)Ý^Ü᝱ᦋ#)ᡠÑᱥkmn!#)ᐸkl!#)ᦑA!ᔠ⚪©Bஹß¹ºᵨ┴ᜮ᦬ᡭᡂ¹ᱏ)ᐸÚᦋ#)ᡠÑᱥkmn!#)ᐸkl!#)ᦑB!ᔠ⚪Cஹß¹º〈ᑮᨴᳫ)ᐸÛᦋ#)ᡠÑᱥkmn!#)kl!#)ᦑC!ᔠ⚪Dஹß¹ºᵨUÊᑴᡂËÌÍᡭÎᐝÐ)Øᨵ1àᑖklḄáᜫ)ã±klᦋ#)ᦑDᔠ⚪஺ᦑ⌱©D஺ூ¯°௃±⚪ὃ²`äklᭆæḄᳮ)³´Ạ(ç)è^!ᜧ஺3.2ᑖKᑡêëᨬíîï▭Ḅ6;KA.«ðᡂñḄòóḄ§^ôu42cm

12B.de«ðõYḄW^ôu8m/sC.deᾭ÷«ðø1ùḄ¨ôu10sD.1cúdeḄklôu50kgூᑖ᪆௃!ûᱥᳮlḄêN)ᨵḄ◤⌕þÿ
ᨵḄ◤⌕ᓫḄᨵḄ⌕ᓫḄᣚᨬᑨᨬᔠ▭Ḅ஺ூ௃"Aஹ$%ᡂ'(Ḅ)*Ḅ+,-.26cm,ᦑA0ᔠ▭1Bஹ23$%45Ḅ6,-.4km/h=4X7-m/s"l.lm/s,ᦑB0ᔠ▭13.6Cஹ$%9:;(Ḅᾭ=Imin>?Ḅ@ᦪᙠ75@CD>?@ḄEFGH1s,ᦑC0ᔠ▭1Dஹᡂ'(IJᙠ65kgCDK2IJᶍMNOᦪPᙠ50kgCDᦑDᔠ▭஺ᦑ⌱"D஺ூRS௃ᱥᳮ32VᔜXᱥᳮJḄYZ[ᡃ]^_`abcḄd⌕Z[efXZ[ḄghVᡃ]Ḅ
i᪵ᐹᨵlᜧḄnop஺4.2ᑖr2019'1ᨴ3t“᳝ᐢxy”{|}ᙠᨴᳫ⊤☢Ḅ“y”⍝;ᑮᨴᳫ⊤☢᝞ᡠᐵN“᳝ᐢxy”;Ḅ;ᑡ2$Ḅ᳝ᐢ--0⍝A.ᨴᳫ⊤☢.᯿ᱥ“y”?ḄB.⍝.᯿ᱥ“᳝ᐢxy”?ḄC.ᨴᳫ⊤☢.᯿ᱥ“᳝ᐢxy”☟ḄD.“y”.᯿ᱥ“᳝ᐢxy”☟Ḅூᑖ᪆௃ᙠẆᱥ?E⌕⌱¡᯿Ḅ᪗£ᓽ᯿ᱥᱥḄ¥¦VN᯿ᱥ§¨ᓄᑣ?0§¨ᓄᑣ☟஺ூ௃"“᳝ᐢxy”{|}ᙠᨴᳫ⊤☢Ḅ“y”⍝;ᑮᨴᳫ⊤☢஺

13Aஹᨴᳫ⊤☢.᯿ᱥ“y”¦VNᨴᳫ⊤☢eF¬ᨵ¥¨ᓄᡠ“y”☟ḄᦑA┯®1Bஹ⍝.᯿ᱥ“᳝ᐢxy”¦VN⍝Ḅ¯ReFḄ¥0§¨ᓄ?ḄᦑB$1Cஹᨴᳫ⊤☢.᯿ᱥ“᳝ᐢxy”¦VNᨴᳫ⊤☢eF§°¥¨ᓄ?ḄᦑC┯®1Dஹ“y”.᯿ᱥ“᳝ᐢxy”¦VN“y”eFḄ¥0§¨ᓄ?ḄᦑD┯®஺ᦑ⌱"BoூRS௃O⚪²⌕ὃ´°?µ☟Ḅ¦Vឋᙠᑨᱥ?µ☟Eᐵ·¸ᱥ¦VN᯿ᱥḄ¥ᔲ§°¨ᓄ஺5.2ᑖr᝞º2Z$⊤ᱥ»ᒴ6½¾?Ḅ¿rV4C.0ூᑖ᪆௃•ᵫᒴ6½¾?ḄᭆÿᱥḼ½¾Å᠒0¨Ḅ?rÇÈᓽÉ஺ூ௃"Ê.ᒴ6½¾?Ḅᱥ½¾?Ë6,0¨{º2ɸÈAஹBஹDḄ6,ᦋ¨ḄÍCḄ6,0¨Ḅ஺ᦑ⌱"CoூRS௃ÎO⚪ᡃ]^_3Ïᵨº$Ḅ⊤ᒴ6½¾?஺6.2ᑖr;ᑡ$Ḅ¿rA.ᙽẈᑗᡂÔ¦ÕḄÖᙽẈḄ×,¨.ØᩭḄÚB.ÛḄ×,ÜÝÞḄ×,ᜧ⊤ÛḄIJᜧNÝÞḄIJC.ßḄ×,8.9Xdkg/n?,⊤In?ßḄIJ.8.9XIPkg

14D.×,0iḄÖᱥᐸIJá0iூᑖ᪆௃×,ᱥIâãḄXᱯឋiXᱥI¿å᝱0¨r×,áçIJஹÔᜧMèᐵ1×,⊤ᓫÔḄ¯XᱥḄIJ1᪷êm=pVÉáÔᱥIḄIJஹᑨᱥḄIJᐵë஺ூ௃"AஹᙽẈᑗᡂ¦ÕḄÖᙽẈḄ×,0¨ᦑA┯®1BஹÛḄ×,ÜÝÞḄ×,ᜧ⊤iÔḄÛḄIJᜧNÝÞḄIJᦑB┯®1CஹßḄ×,8.9Xl
3kg/m3,⊤In?ßḄIJ.&9Xl?kg,ᦑc$1Dஹ×,0iḄÖᱥIJɦi᝞2kgḄÛµì×,0iíIJ¦i,ᦑD┯®஺ᦑ⌱"CoூRS௃â⚪ὃ´×,ᭆÃஹᱯឋïçIJµÔḄᐵëḄᳮðNñẠóôḄὃ´íðN3õ᧕È┯Ḅᑁõ⌕ᱯøùo஺7.2ᑖr᝞ᡠḄnº2²⌕ú[Éᦋ¨ᱥûåḄ¿rV////////7//////////,Müýþÿ
◍ᳫᙠḄᔾᕒᩭḄᳫIᕒᵨ᪗ᢗ"#ூᑖ᪆௃Ḅ(ᵨᦔ*+ᦋᱥ.Ḅ/01ᦋᱥ.Ḅ0᝱3ᱥ.0᝱Ḅᦋᢣᱥ.56ᜧ8ஹ:ᔣḄᦋ஺ூ=>௃=?Aஹ8@AB/38@ḄᦋCABḄ/03ᦑAEFGBஹᳫᙠḄᔾ3HᳫḄᔾIᳫḄ:ᔣJKCᦋ3LMᦋᱥ.Ḅ0᝱3ᦑB┯OG

15Cஹᕒᳫ3ᦋCᳫḄ0᝱3ᦑC┯OGDஹᕒᵨ᪗"#3ᦋC᪗Ḅ0᝱3ᦑD┯O஺ᦑ⌱?AoூQR௃S⚪ὃVCWKHḄ(ᵨᦔ*XY1ᵨ3ᑖ᪆0᝱ᓄ[⌕]?জᱥ.Ḅ56ᜧ8+ᔲᓄ3ঝ:ᔣ+ᔲᓄ஺8.2ᑖa᝞c+defghijḄkl஺mnopqrstuḄ(ᵨᦔ*vḄwa51ᬒNystA.ᜧ8ᨵᐵB.(ᵨQᨵᐵC.:ᔣᨵᐵD.ᜧ8ஹ:ᔣஹ(ᵨQ|ᨵᐵூᑖ᪆௃᪷~cᱥᳮkl3#hὅḄdᜐ3᪷~Ḅ⌕ᑖ᪆஺ூ=>௃=?ᵫcr3ᵨ5NḄᔣfg[3fg?ᵨ5NḄᔣfg[,fgGᵫor3ᙠḄᜧ8v(ᵨQd[3Ḅ:ᔣd3Ḅ(ᵨᦔ*d஺ᦑ⌱?C஺ூQR௃ᑖ᪆cklஹᔠḄ⌕ᑖ᪆+=⚪Ḅᐵ஺9.2ᑖaᑡᐵMḄ3EFḄ+waA.ᱥ.ᐭ.¡[B.ᙢᳫᔾᱥ.Ḅᜧ3ᱥ.ᔾᙢᳫḄ8C.£e¤ᙠᱥ.D.Ḅ:ᔣ+ᚖ¦ᙢ☢ᔣூᑖ᪆௃ᙢᳫ▬©Ḅᱥ.|jᑮᙢᳫḄᔾ--ᵫMᙢᳫḄᔾ¬Iᱥ.jᑮḄ3Ḅ®ᱥ.+ᙢᳫGḄ(ᵨQ£GḄ:ᔣ+¯¦ᔣḄ஺ூ=>௃=?Aஹᱥ.ᐭ.¡[3ᦑAEFGBஹᙢᳫᔾᱥ.Ḅvᱥ.ᔾᙢᳫḄ+eH°(ᵨ3±ὅᜧ8²³´3ᦑB┯OGCஹ£e¤(ᵨᙠᱥ.3᝞eµᙳᒴḄᙊ¹3ᐸ£ᙠ»£ᜐ3ᦑC┯OG

16DஹḄ:ᔣ+¯¦ᔣḄ3¬+ᚖ¦ᙢ☢ᔣ3ᦑD┯O஺ᦑ⌱?AoூQR௃S⚪¿⌕ὃVCHÀᐸᜧ8ஹ:ᔣஹ(ᵨQḄᳮ=vXY3◤ÂÃXYÄẠÆ஺10.w2ᑖa☢+dWËÌÍ.ÎÏ[ḄeÐÑl3ᐸ¡=ÒEFḄ+waA.dWËÓᙠÔÑÕÔ[3ÔÑjᑮÖ®ÍḄ(ᵨB.ᵨᡷᩔ᣸ᳫ[ÛÜᑮÝÞ3+ßḄ(ᵨ+°ḄC.áᳫᢗáÃâ[3áᳫ#ÛãäᯠjᑮÛ®ÍḄæ(ᵨD.ç#Ḅᳫᨬ³éᑮᙢ☢3+ßᳫᙠ»¡jḄ(ᵨூᑖ᪆௃w1aḄ®ᱥ.+ᙢᳫGw2aᱥ.êḄ(ᵨ+°Ḅ3eµᱥ.Hëeµᱥ.®Ḅd[3ìjᑮëeµᱥ.HíḄ(ᵨGw3aáᳫ#ÛãïjᑮÛ®ÍḄæ(ᵨGw4aᙢ☢▬©Ḅᱥ.jᑮ(ᵨ3:ᔣ¯¦ᔣ஺ூ=>௃=?AஹdWËÓᙠÔÑÕÔ[3ÔÑjᑮᙢᳫ®ÍḄ(ᵨ3ᦑA┯O;Bஹᵨᡷᩔ᣸ᳫ[ÛÜᑮÝÞ3ò᣸ᳫHÛì®ÍC3ᡠsᵨᡷᩔ᣸ᳫ[ÛÜᑮÝÞ3+ßḄ(ᵨ+°Ḅ3ᦑBEFGCஹáᳫᢗáÃâ[.3áᳫ#ÛãïjᑮÛ®ÍḄæ(ᵨ3ᦑC┯OGDஹç#Ḅᳫᨬ³éᑮᙢ☢3+ßᳫjᑮ(ᵨ3ᦑD┯O஺ᦑ⌱:B,ூQR௃ᵨᡠWᱥᳮÆᑖ᪆õöp▭øù+ὃúḄQ3ìû᧜CWsýᵨḄþÿ
ᙠὶᑖ᪆ஹ஺11.2ᑖ᝞ᡠ2022!ᓅ#$ᝍ&'(ᵨḄᐰ,-4K0⍝᤬3455“78”஺:ᡃ<=>Ẇ@Ḅ5A,B᤬3Cᜓ“78”E“FGHI”JK᦮MᐳOᙠ0⍝'PFCQᢈS᪗UVWᑮ25m/s஺ᙠB]^_`⚔bPFᕒBdeWᑮ70km/h,“78”jJklVmnoPFᕒḄpqrV᪷t⌕vwxyBஹzBஹ{|}FJ஺~ᑡ`Ḅ

17A.“78”VBFᐸᨬ,BdK70km/hB.“78”ᒴB`ᐸPF᝱ᢝkC.“78”“FGHI”yGḄO“FGHI”“78”kyD.“78”ᙠ0⍝'yBPF“78”“FGHI”☟ூᑖ᪆௃(1)lm/s—3.6km/h¥(2)ᱥM☟ᡈ¨ᒴB©ªPFPF᝱k¥(3)ᱥM«GḄJᵨ¬Ḅ¥(4)ᙠẆᱥMPF⌕⌱¯°᯿Ḅ᪗Uᓽ°᯿ᱥᱥMḄpq°᯿ᱥ@ᓄᑣPFk@ᓄᑣ☟஺ூµ௃:Aஹ“78”VBFᐸᨬ,BdK25m/s=25X3.6km/h=90km/h,ᦑA┯¼¥Bஹ“78”ᒴB`PF½ᔣ@¿ᓄᐸPF᝱ᦋᦑB┯¼¥CஹᱥM«GḄJᵨ¬Ḅ78”“FGHI”yGḄO“FGHI"‘'78”ÄyGᦑC┯¼¥Dஹ“78”ᙠ0⍝'yBPF“78”“FGHI”Å«Æᨵpqᓄ,ᡠÈ“78”“FGHI”☟ᦑD஺ᦑ⌱ÉD஺ூÊË௃Ì⚪ὃÏBdᓫpᣚÒஹPF᝱ḄᓄஹGḄJᵨḄ¬ឋஹPFÔ☟ḄឋÕÖᑮḄ×ØÊÙᔠឋÛÜÝMÞdkᜧàáâẠ×Øᓽe⚪஺12.(2ᑖ)᝞ᡠAஹBKäåæᐰOḄçᘤ஺éᨵäêkVëᔠḄìMìMḄídᑖîKPIÔP2;ò×pi>p2஺éᔣäçᘤ`ᑖî᎔ᐭäêìMøù᎔ú᎔ᐭ½:(1)û}üýḄäêìM᎔ᐭA¥(2)û}MþḄäêìM᎔ᐭBo
AᘤḄMA,BᘤḄMB,ᑣMAஹMBḄᐵ()A.MA=MBB.MA

18C.MA>MBD.ᩩᑨூᑖ᪆௃ᵫ#$%ᘤ&᎔()*+ᓽ+-./0
12ᔠ*+Ḅ4ᙳ67ᜧ,ᜧ:✌ᐜ⊤>?$%ᘤᑁ2ᔠ*+Ḅ4ᙳ67ᯠBCDEFḄᜧGᓽH஺ூJK௃JLM1OPQḄ$R*+᎔ᐭA,2ᔠ*+Ḅ67L᝞=ߟ__2P#2v\£1MAPi+P2p1P2PQ+-Ḅ$R*+᎔ᐭB,2ᔠ*+Ḅ67:bcd"»gVV2-(pi-P2)22P1P914Plp2-(0[+஺2)2ᓽLPA-pB=----------------(PI+P2)=------------7---------------r---------P1+P222(P[+P2)2(P)2<0(pi>p2),0
pA

19Bஹ¢¦§Ḅ┯ὅᙠ¦§È0ஹᔲÅ®¯QÄ☢ᙳ/ᦑB┯:Cஹ⌱ᵨ¨6Ḅ¢©ᘤH¤GᦑC:Dஹ¬¢H¤GÅ®¯ᦑD┯஺ᦑ⌱LACoூvw௃x⚪ὃ{)˧ᭆÍḄ)Jª⌕⍝¦§ḄÈ0¥Å)JÎÏ¢H®¯Ḅ◤⌕ÑḄ┯஺M⌱O14.2ᑖOᐵ#Ò7ᑡḄMOA.Ò7Óᜧ⊤>ᱥ+ÔÕsÓÖB.Ò7Óᜧ⊤>ᱥ+×±ḄزÓÙC.Ò7Óᜧ⊤>ᱥ+ᡠᵨḄ¶ÓÛD.Ò7Óᜧ⊤>ᱥ+ᓫݶᑁױزÓÙூᑖ᪆௃জᙠᱥᳮË~ᵨÒ7àáᱥ+ÔÕḄÖ᠒Ò7Q#ÔÕᱥ+ᙠᓫݶױḄز:ঝᱥ+ÔÕزḄᜧG³Ò7ä¶ᨵᐵLঞᱥ+ÔÕ¶ḄÙÛ³ÔÕزäÒ7ᨵᐵ஺ூJK௃JLAஹÒ7⊤>ᱥ+ÔÕÖ᠒ḄᱥᳮÒ7Óᜧ⊤>ᱥ+ÔÕsÓÖᦑA஺BஹزḄᜧG³Ò7ä¶ᨵᐵÒ7æᜧ¶çزÙÛÅçᦑB┯:CஹÔÕ¶ḄÙÛ³ÔÕزäÒ7ᨵᐵÒ7æᜧزç¶ÙÛÅç,ᦑC┯:DஹÒ7Óᜧ⊤>ᱥ+ᓫݶᑁױزÓÙᦑD஺ᦑ⌱LAD஺ூvw௃
⚪ὃ{ḄᡃFÒ7ᭆÍஹᱥᳮéஹêë|}ḄᳮJä~ᵨì#íẠïðvᑁ◤⌕ñòóô஺M⌱O15.2ᑖOõöᔣøù?%ðúGḄGᳫGᳫøᓣäý&þÿfḄᵨᜧ஺ᳫᓣᑮḄᔠFi,ᑮḄᔠF2,ᑡḄ!"A.ᳫᓣᑮḄᔠFi=G+f,#ᔣᔣ

20B.FI>F2C.ᳫᑮḄᔠF2=G+f,#ᔣᔣD.FIF2Oᦑ⌱=AB஺ூfg௃h⚪ὃjk789Ḅᔠᡂ8⍝mẠ⚪H;⚪ḄᐵpᑨrsᳫtuᑮḄ#ᔣ஺vஹwx;L⚪(ᐳ36ᑖz16ஹ23⚪ᔜ6ᑖz17ஹ20⚪ᔜ5ᑖz18ஹ19⚪ᔜ3ᑖz21ஹ22⚪ᔜ4ᑖ)16.(4ᑖ)(1)᝞V1ᡠḄN6.80cm஺(2)᝞V2ᡠḄᦪN3.6N஺

21ᖗnpinpiiᖗᡠᖗipmOcm123456712ூᑖ᪆௃(1)ḄᑖCA9⊤Ḅ஺ᵨ⌕ᐸᑖ0sᱥ¡ḄH¢ᨵ09Ḅ⌕¤¥89Nfs¦§ᡠ¨ᓽNᱥ¡ª«⌕¬ᑮᑖḄ8H(2)✌ᐜ°Ḅ±²Fᑖ³᪷6ᢣ┐¶ᦪ஺ூ;L௃;=(1)ᵫVa=1cmE¸ᨵ10Z¹ᡠ¤8Z¹º⊤1mm,ᓽḄᑖN1mmH»¼G0.00cm¨½¾¼G6.80cm¨½ᡠ¤ḄNL=6.80cmH(2)ᵫV`aḄ8Zᜧ¹ᑖN5Z¹ᑖN0.2N,ᦪN3.6N஺ᦑLᫀN=(1)6.80H(2)3.6஺ூfg௃h⚪ὃjḄFḄᦪÂᜧÃmẠ⚪஺17.(2ᑖ)᝞VᡠN10NḄᱥ¡A☟ÆᙠÇ☢Ésᱥ¡AᑮḄ«V஺ூᑖ᪆௃᪷6Ḅ#ᔣᔣḄV.ூ;L௃;=Ḅ#ᔣᔣḄÊËÉ8ᩩÍÎᜮḄᔣḄᨵᔣ9Ð,ᵨG⊤ᜧN10N,᝞Vᡠ=ூfg௃h⚪ὃjkḄ«VḄḄ#ᔣÑᔣḄ஺18.(5ᑖ)ᑭFÓᔠᑭᵨ᝞VᡠḄÔ¶ÕÖ“±ØtuḄÙᙳÛ”wx஺

22ØÝÇ☢Afᵫ☟ÆÞᙠAஹBஹCvfᙳᨵᵯà⊤á¸!ᦪâᑖã⊤“=ᑖ=ä”"åæLᑡç⚪=00:00:00!1"èwxḄwxéᳮV஺஺t!2"wxíîᑴÇ☢ḄᚁK!⌱ñ“ᜧ”ᡈ“”"Y᪵`¤¦¸±ḄôJ஺!3"ØᙠABÐḄÙᙳÛVAB=10.0m/s஺!4"᝞_ᙠwxA÷¢ᨵøᢝ7úᑭûüØᙠýÓᙠþÿᙳᜧ⌱“ᜧ”ᡈ“”஺5ᙠ☢D☢AᡠḄᔣ"#⌱“"#”ᡈ“$#ூᑖ᪆௃1*ᙳ◤⌕ᵨᑮ/01⊤ᑖ3ᩭ*56789:ᑭᵨv=>?@tᙳB2☢DEF:ᱥHIᓄF᠒:ᱥHLM89FN:FOP89Ḅ*5B3᪷STUVWABYḄZ[\89:Lᵨ]^v=>_WABYḄᙳBt4ᑭabᙠc:def?8ᙠg:?8hijk:lmᡠ*5Ḅ89,᪷S]^v=>ᑖ᪆*oᙳᜧBt5ᔣpqrᔣsḄ஺ூtu௃tv1*ᙳḄwxyᳮp{=|Bt2wx}:~l☢Ḅᚁ:᪵*589:O?8:*589ḄB3LMZ[SAB=80.0cm-40.0cm=40.0cm,tAB=00v00v04-00v00v00=4s,ABYḄᙳvVAB=9~=4°°cm=i0.ocm/sB4s

234ᑭabᙠc:def?8ᙠg:ᑣ?8hijk:᪵ᡠ*5Ḅ89:᪷S]^v=>:*oḄᙳᜧBt5ᔣpqrᔣsḄ:ᡠᙠ☢C☢AᡠḄᔣ"#஺ᦑuᫀv1v=¡B2B310.0B4ᜧB5"#஺tூ¢௃£⚪ὃ¦§*5ᙳwxḄyᳮஹ©ª«⚗ஹ®y¯°±Ḅ²³:´µᑖ᪆®y¯pᐵ·஺19.3ᑖ᝞Tᡠ¹pᵬஹ»¼½ᵯM¿ᐹ#8#ᔣÁrÂLMḄ67Ã89IᓄḄTÄ஺᪷STÄÅv1¼ᐰ7ᙳÇᒴ⌱“ᒴ”ᡈ“I”rÂLM஺2ᵬᜧP»⌱“ᜧP”ஹ“P”ᡈ“°P”Éூᑖ᪆௃1᝞Tᡠ¹s-tTÄ:ᵬ\»ḄTÄÊpjᩩDḄrÂ:ᡠ¼ᐰ7ᙳÇᒴrÂLM;2᪷STÄÍWᵬ\»§~Ḅ67\89:᪷S{=>?@Wᵬ\»Ḅ,tᯠgÏÐÑB3?@WÒ1sᑁ:»\ᵬḄLM67:ÔÑᓽÅ஺ூtu௃tv1s-tTÄ}:ᵬ\»ḄTÄÊpjᩩDḄrÂ:Ö×ØÙḄ67\89ᡂ´Ñ:ᡠ¼ᐰ7ᙳÇᒴrÂLMv2᪷STÄÅᵬḄvv:v=^^=%=0.9m/s,»Ḅv{»=Ýtᵬ20st__lUiuQ^m/s,=20s

24ᡠV¥>V»B3
Ò1sᑁᵬLMḄ67vsi=vnit=0.9m/sXls=0.9m,»Ḅ67vS2=vz,t=0.5m/sXls=0.5m,ÒIsᑁ:»ÑᵬãLMḄ67vsi-s2=0.9m-0.5m=0.4moᦑuᫀv1ᒴB2
ᜧPB0.4oூ¢௃£⚪ä⌕ὃ¦]^Ḅ~ᵨ:t⚪Ḅᐵ·p⌕åᔠTÄᑖ᪆tçᐹHè⚪஺20.3ᑖéᙠwxê*5ëìᙽḄî஺éᐜᵨð⁚òḄᜩ*5ëìᙽḄô5஺ᜩ⊝g:ö÷}ᡠbøṹúûṹᙠ᪗0ýḄþÿ᝞
ᵬᡠᑣᙽḄ54g.ᯠᙽᵨᨵ40mLḄḄ☢ᓣ!ᑮ᝞
#ᡠḄ$%ᑣᙽḄ&'20cn?.(ᙽḄ)*+,⊤.Ḅ)*/0஺ᱥ34)*p/kgn/3
610.5X10378.9X10387.9X1
3.2.7X103✌D50glualnn巨昌ᵬூᑖ᪆௃>1?@ᜩBḄCᦪEFᱥ&ḄGHIṹḄKLMṹᡠNO*P⌕RSCTMṹᡠNO*UVWS᪗YḄᑖ*Z[\Mṹ]^ᡠNO*R஺᝞
_᪗YḄᑖ*Z`0.2g஺>2
ᵨ᣸FbᙽḄ&'CcḄ&'de+f☢>gf☢Ḅhi?/B஺jkḄ&'Vi=40ml,ᯠbᙽlḄm&'V2,v*-V-Vi»23
᪷@)*opp=qrTᙽḄ)*+)*⊤ḄstḄ)*uvwVxᑨz`st஺

25ூ{|௃{}>1
᪷@ᜩBḄCᦪEFm~=Mṹ+MṹNO*Z=50g+4g=54gᦑ|ᫀ}54>2
᪷@ḄCᦪEFe+f☢g☢hiB᝞
ᡠ_Ḅᑖ*Z`2ml,ᡠ\Ḅ&'Vi=40ml,ᩈᙽlḄm&'V2=60ml,V=V2-Vi=60ml-40ml=20ml=20cm3ᦑ|ᫀ}20>3
᪷@)*opp=TjkᙽḄ`54g,&'`24cm3,p=-54g_=2.7g/cm3=2.7X103kg/m3,20cm3᪷@)*⊤p=.ᦑ|ᫀ}.஺ூ௃_⚪`b)*Ḅ⚪⌕ὃᜩBஹḄCᦪ[)*Ḅ_ᜩBl`ᱥᳮ_Ḅbᐹஹஹ4ஹCG`_Ḅk⌕r,UV¡¢ᱞ¤஺21.5ᑖ?¥¦b§Ḅ)*¦᝞,}迎Ag1u—IIIo1r1131114II5KA2ᵬ#¨1
ᜩBᙠBª☢LMṹ«ᑮ᪗YḄ¬Oᜐ஺®᫡☟±dᢣ┐ᢣᙠᑖ*´µO*Ḅ]¶᝞
ᵬᡠ஺·®᫡ᙠB$%B⊝®᫡¹^ḄB⊝º»ᔣ¹^«½஺2
ᨵ〉§Ḅ¿Àᙠj⁚ḄᜩB]´ᑁbT¿Àl§Ḅmmi128g஺ᯠ¿§ḄÃiᑖ᎔ᐭ᝞
#ᡠᑣ§Ḅ&'V60cm3o

26>3?ÇᨵᒕɧḄ¿ÀᙠᜩB]´ᑁᦋËIṹḄÌᦪlMṹḄ$%·ᜩB®᫡ÇÍᙠB$%B⊝Îd¹´IṹlMṹᙠ᪗YLḄ$%᝞
¨ᡠᑣ¿À[¿ᑁᒕɧḄmm362g->4?᪷@LÕᦪ@T§Ḅ)*p1.1X1Q3kg/m\>5?ßàT_Íᦪ@Ḅáâ⊤ã஺ூᑖ᪆௃>1?ᜩB⁚B⊝d⌕⁚B⊝º»ᑣ`“¹å]]å¹”ᓽᢣ┐ᔣ¹åwᔣ]B⊝º»ᢣ┐ᔣ]åwᔣ¹B⊝º»]¶Ḅè`¹¶ḄB⊝º»Ã᪵>2?Ccf&Ḅ&'d✌ᐜ⌕WSḄᑖ*ZCᦪde+f☢ᨬgᜐ/B>3?ᜩBB⊝dᱥ&ḄGHIṹḄKMṹᙠ᪗YLᡠNḄO*Z>4?¿Àl§Ḅmìí¿ᑁᒕɧḄm`§Ḅjk§Ḅ&'᪷@)*oprT§Ḅ)*>5?᪷@îïḄbðḄlᡠrḄñ⊤ã஺ூ{|௃{}>1?ᵫ
ᵬkᢣ┐å]ᑣᔣ¹«½B⊝º»óᑮ®᫡B⊝>2?ᵫ
#xkḄᑖ*Z2mL,f&Ḅ&'V=60mL=60cm3>3?ᵫ
¨k᪗YḄᑖ*Z0.2g,ᑣ¿À[¿ᑁᒕɧḄm3=50g+10g+2g=62g>4?§Ḅm=128g-62g=66g§Ḅ)*}m=_^—=l.lg/cm3V60cmJ=l.lX103kg/m3>5?᪷@îïḄbðḄlᡠrḄñ⊤ã}þ¿l§Ḅm§Ḅ&þ¿l¿ᑁᒕɧḄ§Ḅ)*mi/gV/cn/m3/gm/gp/g/cm3ᦑᫀ126036241.1X1035!஺ூ$%௃'⚪)*+,Ḅ./012ὃ45*Ḅ67ஹᜩ:;<Ḅ=ᵨ?./Ḅ@ABᑁD஺22.4ᑖFGHIᵨ01Ḅ67ẆKHLMNOPQᔠᡂḄTU201VW᝞Yᡠ[஺

27\✌ᐜ_`abcdef0$gh2iᵨjklmnḄop*Q@AஹBᐳHrsM6ᔣᔣOc஺$dO'$2op*Q@[ᦪᑖvFAஹFB஺wxᩭ\ᵨLklmnḄop*Q@Cz_O${c|ᑮO,$2op*Q@[ᦪFc,~ᡃFc)FAஹFBḄᔠQ஺1HIj01_`abO$c|ᑮHL$O'ḄḄ)=j01`abḄᵨᦔH஺2
'01ᑭᵨḄᱥᳮ67)Bᦔ7஺§஻஻஻஻஻஻£஻஻஻஻ூᑖ᪆௃opḄ|f᧜5QḄᵨᦔ01ᵨ5Bᦔ7஺ூ!௃!101j__opAc|ᑮHL$஺ḄḄ)=jQḄᵨᦔH2
ᵨLklmnḄop*Q@Cz_O${c|ᑮCT$2~LkQḄᵨᦔ᜜jkQḄᵨᦔH2~)Bᦔ7஺ᦑᫀ1ᵨᦔ2
Bᦔ7஺ூ$%௃'⚪ὃ45QḄᵨᦔஹBᦔ7Ḅᵨ2¡Ạ⚪஺23.4ᑖF£ᵨop*Q@Ẇ¤opḄ|fcQḄᐵ¦2*Q@§0¨5N஺F£ᐜᵨ©/ª*«op*Q@opḄf/2ᯠn_ṹ⌲k°ᢞᙠop*Q@x2᝞Yᡠ[2ᑖv³«op*Q@Ḅ[ᦪ2ᵨ©/ªᑖv*«´opḄf/201ᦪµ¶·᝞x஺F£¸¹opḄ|f;cQºᙠḼLhḄTU2¼*Q@xᢞ4NḄᱥ,2opḄ|f16cm,ᡠ½µḄTU)ᙠoឋ▲/ᑁ2opḄ|fᡠÀḄcQᡂÁÂ஺cQ/N00.511.522.53

28opf/3.85.87.89.811.813.815.8/cmop|f/cm』a山4d5N1N5N2.5N3Nூᑖ᪆௃op*Q@Ḅeᳮ)ᙠoឋ▲/ᑁ2opḄ|fᡠÀḄcQᡂÁÂ;✌ᐜ᪷µ01ᦪµÅ«opḄef;|fcQḄᐵ¦2iÆ*Q@xᢞ4NḄᱥ,2opḄ|f஺ூ!௃!ᵫ⊤ᦪµÉÊ2cQ02opḄf/3.8cm,ᓽef3.8cmᵫ⊤ᦪµÉÊ2opḄ|fcQḄᐵ¦)7.8cm-3.8cm11.8cm-3.8cm15.8cm-3.8cmÌL=•=4cm/N2IN2N3N¼*Q@xᢞ4NḄᱥ,2opḄ|fL'=ALXF=4cm/NX4N=16cmᡠ½µḄTU)ᙠoឋ▲/ᑁ2opḄ|fᡠÀḄcQᡂÁÂ஺ᦑᫀ16ᙠoឋ▲/ᑁ2opḄ|fᡠÀḄcQᡂÁÂ஺ூ$%௃⚪ὃ4Ḅop*Q@Ḅeᳮ஺◤⌕×Ø)opÀᑮcQ2opḄf/BopḄef°OopḄ|f஺24.6ᑖFGHIᙠÙK“ᱥ,ᡠÀÛQᜧFḄᐵ¦”2ᑖvᵨᜩ:;op*Q@*«ÞHṹḄ;ᡠÀḄÛQ201ᦪµ¶·᝞x஺ßàxᑡâ⚪஺101Ḅãä)2åä)ÛQ஺2
᪷µ⊤æᦪµ2ÛQḄÂç10N/kgoᐸᱥᳮØé)1kgḄᱥ,ÀᑮḄÛQᜧF)10N஺m/kg0.050.10.150.20.250.3G/N0.511.522.53

293
Fê{ë@ìíᡂ5012\᪷µãî*ÅḄ01ᦪµ2ïᑴ5᝞Yᡠ[ḄG-mYñ஺FòHI¸¹Yñìóᨵõöᙶ᪗e$஺\ù01ᦪµúûü᪶2¸¹*;¶·ᙳÁÿ
஺ᡂᐸᔠ▭ḄABD⌱"ᑏ⌱⚗%&'(஺A.ᱥ*Ḅ+,-ᓄ/ᙳᒴᡠ3B.45678,9ᐹ/;<ᡠ3C.=>8?@AᨵCDᡠ300.050.10.150.20.250.30.35ூᑖ᪆௃1
ᙠJ◤⌕Mᢝ-Ḅᱥᳮ,PQᑴ-,STU6-,PVW-,XYᙠJᨵZḄᙢᦋ-Ḅ-,ST]^-,P_6-,S2
ᑖ᪆`abc`ᱥ*ᡠdḄe?f+,Ḅᐵh஺᪷jᦪj@l4bᐸmnlON/kg,ᐸopq+,71kgḄᱥ*dᑮḄe?ᜧt10NS3
u`aAᨵᙶ᪗U4x`+,70y=>8?@ᨵzᦪ{|=>8?@}~AᨵᢣᙠD஺ூ௃q1
JTU6-,PVW-,XYᙠJᨵZḄᙢᦋ-Ḅ-,;T]^-,P_6-,“ᱥ*ᡠde?ᜧt+,Ḅᐵh”yJḄW-,q+,6-,qe?S2
᪷j⊤ᦪj4xᱥ*ᡠdḄe?f+,Ḅmnnmᦪᐵhᓽg=10N/kg,⊤Ḅᱥᳮpq+,71kgḄᱥ*dᑮḄe?ᜧt10NSm3
u`aAᨵᙶ᪗U4x`+,70y=>8?@ᨵzᦪ{|=>8?@}~AᨵᢣᙠD஺ᦑ⌱⚗ABDᔠ▭Ḅ஺

30ᦑᫀ7q1
+,Se?S2
10S+,71kgḄᱥ*dᑮḄe?ᜧt10NS3
ABD஺ூ௃⚪ᱥ*ᡠdḄe?f+,ᐵhḄὃ¡JᦪjḄᑖ᪆5?¢ᭆ¤5?஺ஹ¦§▅z⚪ᐳ4ᑖ(25.4ᑖ(ª▅z«u“¬®”ᑮ“ᜩ°”±²³°⚪஺u“¬®”ᑮ“ᜩ°”1970´µ¶⚩¸⌼º»“¬®¼”ᡂ½ᓣ¿ᑮÀᜩµḄÁᜩÂÃ50Å´Ḅᔊ஺ᙠÇÈÉᨴËᡃµÁᜩÍÎÏ⌼“Ð=»”ஹѸÁᜩஹᓅᧅ9ஹᨴᳫ8ஹÕ»8Ö7×⊤ḄØÙᡂXÃcᩩW?Û¡ஹWÜÏÝḄÞ⍝à஺ÁᜩÍÎá}âÑÕãᡃµḄäåhᑡÕãḄÞ4ᑖ7▤È᝞⊤1q⊤1Þ▤È×⊤é¼Ü⌕ᱯëìḄÞíîï¶×âÑÕCZ-1ᐹᨵ|ðḄᡊᶍóᘤé¼ᱯ⬮¼ãÑ5?Öõ*ឋ5÷ø¶ù×âÑÕCZ-2Cúᵨᨵüýþᑺ
ᵨᦪᑴ“”ᨩᱥCZ-2F〉"#$ᜧᜧ&'(#)*+,-ஹ/0-12ᜩ◤5(67ᦑ9:;<⌫⍎(?ᓄrABCDECZ-5
ᵨFGFHIJKᑺ(
ᵨᐰᜩN--OPᢈR<ᐜKḄᵯVWᜓ,ᨬᜧ#$[ᑮᜧ]&ᓣ_`ab(ᡃd"ᵨefᑡᡂiABjk2ᜩlmᘤ஺⊤2q-rᐺtlmᘤḄuv஺⊤2wxymᜩz{/kg|⍝~lm'/kmmᕜ/min-ᙢᳫ173ᙊ437.7-2057.6110.3

31-Aᙢᳫ750ᙊ900102.86Aᙢᳫ1200ᙊ357861440EAᙢᳫ5400ᙊ357861440+,lᙢᳫ7840ᙊ34391.64/0-ᘤᨴᳫ2350ᙊ200127ᜩN-ᘤ5000ᙊ280590002880ᡃd1ᙠᜩN“⍒ᜐ(¡¢⍝£¤¥¦~(§ᵫὃ£”⊤ª«¬<®¯Ḅᔣ±஺d(²aḄ“ᦑ³”ஹᨬ´Km“lᜩ”µ¶Ḅd(ᙠ·`¸¹ºAḄ»¼(½¾¿ḼÁ᩽Ã⌕ḄÅ⁐஺dḄÇ2ᜩ1ȽᙠẑÊËm(Ì$Íᧅ(ÏdḄlJᔣÐ7ᴸÒḄÓÔ1
ᡃdABḄ“ᜩN-”ᘤÕÖḄqÔ⌱Ø“”ᡈ“ᨴᳫ”ÚḄÔ2
“+,”lᙠyᙢᳫmÛḄÜ᝱AÞÔ⌱Ø“AÞ”ᡈ“ßAÞ”Úᦋá3
âã⊤1äå(Eæ-çè(éêq#$ᜧ]&ᓣÔ&ë-ᩩᓽäÚÔ4
âã⊤2ᡠïḄuv(ð#OñëælmᘤmᕜçᐵḄóôqlmᘤḄmᕜæ{Fᐵ஺Ô&ë-•ᩩᓽäÚூᑖ᪆௃Ô1
“ᜩN-”ÕÖḄq“”ḄÔ2
lyᙢᳫm(Üᔣᙠßúáᓄ(ᡠûÜ᝱ßúAÞᦋá3
᪷ý⊤1,EḄéê
ᵨFGFHIJKᑺ(
ᵨᐰ-OPᢈR<ᐜKḄᵯVWᜓ(ᨬᜧ#$[ᑮᜧ]&ᓣÔ4
ᑖ᪆⊤3ᑡ<6þÓJ,lmᘤmᕜæ{Fᐵ஺ூÿ௃1
“ᜩ”Ḅ“”Ḅ2
ᙢᳫᔣᙠ"#$ᓄᡠ'(᝱"#*+ᦋ$3
᪷.⊤1,01234Ḅ567ᵨ9:9;<=>ᑺ7ᵨᐰ4ABCᢈEFᐜ>ḄᵯIJᜓᨬᜧ3NOPᑮᜧRSᓣ4
ᑖ᪆⊤W03ᑡF06Yij,ᘤᕜ\]^_9ᐵ஺ᦑᫀd1
2
*+3
3NOᜧRSᓣ4
ᘤḄᕜ\]^

32_9ᐵ஺ᐸgᫀᔠᳮᓽkᑖlூno௃p⚪rstuvnὃxy(᝱FzOᐵ{ᑨ#}▅ᩞᧇ⚪ḄNO"ᜧ஺ஹ⚪ᐳ10ᑖ஺025ஹ26⚪ᔜ3ᑖ027⚪4ᑖl26.3ᑖlᙠ'80km/hḄᙳy2h,2hḄ஺ூᑖ᪆௃᪷.s=vtP2hḄ஺ூ௃2hḄs=vt=80km/hX2h=160km஺2hḄd160km஺ூno௃p⚪ὃxḄᵨ⍝¡Ạ⚪஺27.3ᑖl£W¤+ᡠz¥O600N,ᑣ§£W¤+Ḅ^_¨©kg?g=10N/kg
ூᑖ᪆௃ª⍝W¤+ᡠz¥OᑭᵨG=mgᐸ^_஺ூ௃ᵫ6=0^PW¤+Ḅ^_m=g=.60°N_=60kg஺g10N/kgW¤+Ḅ^_60kg஺ூno௃p⚪ὃxy¥OḄᵨ®¡Ạ⚪¯஺28.4ᑖl°±²³´µB^_d170g,¶ᙠ²Wᐜ³20g·¸¹³´µB^_d180g,ᑣ·¸Ḅºd¨©»ூᑖ᪆௃±²ᑁ½´µ¾¿ᐭ·¸ÁµÂÃÄÅ·¸ḄÆÇÈ®᣸ʵḄÆÇ˪±²FµḄ^_d170g,·¸Ḅ^_d20g,ᵫÌÍ'᣸ʵḄ^_˪µḄºÍᑭᵨV=L᣸ʵḄÆǹᑭᵨp=1·¸Ḅº஺PVூ௃ᵫ⚪Ϊma,i=mlK+mµ=170g,m·=10g,mB2=m²+mϵ+m·=180g,ᑣ᣸ʵḄ^_dm᣸µ=111Bi+m·-mB2=170g+20g-180g=10g,ᡠ'᣸ʵḄÆÇdV᣸µ=Ò+=l°g?=10cm3,Pµlg/cm3ÓV·=V᣸µ=1Ocm^,m·=20g,ᑣ·¸Ḅºp»=?L=-^^=2g/cm3஺V·10cm3·¸Ḅºd2g/cn?஺

33ூno௃p⚪ὃxyÔᱯÖḄ_ÆÇḄ×'}ᑭᵨv=ØÆÇᑭᵨPPÙº஺

34