2021-2022学年北京市某师范大附中中考物理模拟预测试卷含解析及点睛

《2021-2022学年北京市某师范大附中中考物理模拟预测试卷含解析及点睛》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。

2021-2022
ὃᱥᳮᔁὃ1.ᵨ2B⌱⚪ᫀᙠ⚪!ᵨ0.5"#$%&⁐()Ḅ+ᡈ-(./⚪Ḅᫀᑏᙠ⚪Ḅ⚪1ᑁ஺ᑏᙠ⚪ᔁஹ₝6ᙳ8ᦔ஺2.⚪:!;<▅>⚪Ḅ?@⚗B!ᢥDE⚪஺Fஹᓫ⚗⌱⚪HIᜧ⚪7K⚪!L⚪3ᑖ!ᐳ21ᑖO1.ᵬQRSTUV᝞XᡠZ!ᐸḄLFSTU\]!ᵨ^_ᑖ`aᱥG1ஹG2bc]Ḅcd!efTUVḄ᥅h!iᑡklmnḄoA.pGI=G2,qrsḄt᜜v]B.pGI=G2,qrsḄwv]C.pGxG2,ᵬḄyzᦔ᳛ᜧ|QḄyzᦔ᳛D.ᵨᵬQᐸḄ}~FSTUVbe]Ḅaᱥ!yzᦔ᳛e2.᝞Xo᯿yḄᡂZX!iᑡklmnḄoHOA.⌕ᙠᱏᡂKḄ!ᱥᜧ|2ᯖB.ᡠᡂḄo᎔ஹKḄC.⌕ᱏḄᜧ!ᜮ%D.᯿yḄᜮ|3.iᑡᐵ|“ᐝ”ḄklmnḄoA.⁐ᐝḄ¡¢⁐o£ஹ¤ஹ¥¡¦§⁐ᐝB.¨©Ḅ᪛«i¬®ᙊ°Ḅᐝᦿ!²oᵫ|ᐝḄ´µ¶ḄC.·¸¹ºᱥḄ»ᴻ½ᜋ⌼ᡂᐝÀÁ!²oᵫ|ᐝḄ´µ¶ḄD.ÃÄÅᩭÇÈ▭Ê!²oᵫ|ᐝḄᢚµ¶Ḅ4.XᡠZᵯ·!ᵯÍᵯÎÏᢝe!ÑᔠÓᐵ!TÔÕᘤḄTᱏPᔣØTÔÙ!iᑡklmnḄo

1A.ᵯÎ⊤Zᦪᜧ!ᵯÝ⊤ZᦪK!ÞßᨩB.ᵯÎ⊤ZᦪK!ᵯÝ⊤Zᦪᜧ!ÞßáC.ᵯÎ⊤Zᦪᜧ!ᵯÝ⊤Zᦪᜧ!ÞßáD.ᵯÎ⊤ZᦪK!ᵯÝ⊤ZᦪK!Þßᨩ5.᝞XᡠZoᵬâQR¦ᱥãḄãäâåæᐵçX!iᑡklmnḄoA.QᱥãḄ©dÇÄᜧB.åæè50cm3ḄQᱥãḄãäè35gC.ãäè25gḄᵬᱥãḄåæè20cm3D.ᵬâQRᱥãḄãä]Ù!QᱥãḄåæéK6.ᙠ“ᙢ◫”ìíᦗïðñ!òóôᕒðñÙᡠö÷Ḅø®ùúâᵨᑮḄᘤᩞ!ᒹþḼ
ᱥᳮ.ᑡḄA.ᵨᘤḄ┐ᜮB.ᵨᘤ!ᑁ#$%ᑭᵨᜧ(C.)*+,$-./012345ᑮ+,$Ḅ(ᕡ8᡽ᦣ;+,?@ABḄCDḕFᩨᩚ7,IJKLMNᦪPQᑴ⌼TU$ᓄᜩᯠ(Yᵨ--LNGḄJ]஺$ᓄᜩᯠ(Ḅ_⌕ᡂbᵬdᵬdḄᰚf-182.5Cஹhf-161.5C.LNGᙠTU$ᓄᜩᯠ(.jIklᑁᨬ〉oḄpqA.-185࠷B.-163࠷C.-160࠷D.0࠷rஹst⚪vwᜧ⚪7⚪ᐳ21ᑖz8.᝞|ᡠ~ᵯᵯKi=10C,7?2=20Q.ᔠS,ᵯ⊤VIஹV2Ḅ~ᦪ2
3,ᑣᵯ⊤AiஹA2~ᦪ,&=Q.ᔠSiஹS2,ᵯ⊤AiஹA2~ᦪ,ᵯ⊤ViஹV2~ᦪo

29.ᙠ᪛;᪛ᨵ
ᙊḄᐝᦿ8ᵫᐝ___________ᡂḄ¡¢£¤ᑮ¥IḄ¦8ᐝḄ;<¡§¨ᑮ©-ᨵª«¬%®Mᑨ°±²³´Ḅµ¶8_⌕·.µ¶Ḅᩭᑨ°Ḅ.10.¹º»ᡃ½⎅¿ᨵÀḄÁ§/ộ⁐✏ᕡÆÇḄ¹º»Èᑮ⚶ÊM%✏ËÌÍ8;<¡¹º»M“Ï(ÐДÒḄᱥ᝱ᓄ____.11.ᱥᳮÔḄ²³½ᙠÕÖ×ᑖᵯØÙÈḄᵯUÚÛᵯØIÜÝ¢ᵯÞRḄᐵà%áâḄãäᦪå᝞⊤ᡠ~.æ᪷å⊤Iᦪåèé±஺ÚRḄᐵàêU=.R/Q048121620UN2468101212.;ᨵÙÝëìLiஹL2,ᑖí᪗ᨵ“10V1OW”ï“9V5.4W”Ḅð᪵஺§òó½ôὶöᵨ%v/÷ëøᐝ,ù/÷ëᐝúᨩzᵯØÙÈᐕýḄᨬᜧᵯV,ᵯØ+ὑḄᨬᜧÿ᳛
Wo13.ᓝ”ᜩ᝕ᕒᙠ
ᙠ___,#ᜧ
Ḅ&⌱(“*”ஹ“,-”ᡈ“⁐”0#ᜧ.“2345”67Ḅᨴᳫ:;<=>?✌Aᨴ☢CḼ▮&᝞GᡠI0.ᨴᳫ:ᑭᵨLᙽ□OᵯQRSTᓄᵯOVW:XYZ[.\[ᵯ
]^______⌴abḄ.14.᝞GᡠIḄᡲdeᑭ;f>ghḄᜧijklm_mmnopqᡠrsḄjktuopv-P=13.6x103kg/m3,gw10N/kg,x!J100mmnopqrsḄjkPa.

34ஹzG⚪&ᐳ7ᑖ015.᝞GᡠIᱥᙽARW:ᙠo☢ᔣᒴ[W:ᯠ☟ᩈᙽᓽᙠW:ḄRᩈᙽ^>ḄIG.16.᝞GᡠI᪷W┐☟Ḅᢣᔣ᪗ᵯḄஹ᩽.17.ᐝ¢A0£¤ᴻ¦§ᑮiᙠGᵬ>6Ḅᢚ§ᐝ¢஺&0¬ஹ;f⚪&ᜧ⚪ᐳ5W⚪ᐳ20ᑖ018.ᙠY®ᵯ¯]^°±rsḄ²³´µ¶·¸ᨵᐵ»ᵨ᝞GᡠIḄ;f¼½¾¿ÀᵬஹÁLGÂÃÄÅᑡÇ⚪.■:RflKSQ___■tAd-HIrf-fr4Èri.JI5஺|UU11஺஺IIIUU[SQ]ᵬMÁ
1
ᙠᵬG;f>Ê]ᵯËÌÍ<ÎUÏÐᑁÒ☢n-ÓᓄÔᜧÕ⊤×Øᙠᵯ¯ÌÍஹ]ᵯËÌÍḄÙÚÅ°±Ḅ______ÛᜧrsḄ²³Û´.ÁGḄ¼½
ᵨᩭẆ®ᵯÞßrsḄ²³Ḅᐵà.ᙠ;f>¿ÀᑮáஹLÎUÏÐ>Ò☢â#ã᠒᎔ᐭA/BCḄ:ᵨECFḄ!:ᦈHḄᦪJKLᙠN⊤
஺PQᐭ180gḄR:STQUBᘤ஺

4AB123123ᘤᑁḄBC/g60—18056104180ᘤᑁḄ!/cm2—624867ᘤᦪ/Pa200400600200400800(1)5⊤W
ḄXYᜐ⊡ᐙ\᦮஺(2)ᑖ᪆⊤
ᦪJ`*aᘤḄḄ!_________;dᑮḄ"#ᜧ%f(⌱i“ᨵᐵ”ᡈ“nᐵ”(op)\ᡂstR:%45fsuᳫ8ᐭAᘤ
:suᳫwxᙠ☢y:☢STyᓣᑮᘤ{஺5suᳫᐰᐭ
:᣸40cmঞḄ:ᑣsuᳫḄ23cm3,3g/cm3020.%ᩋᵨNᡠḄstᩨᩚḄ⊝ᩩ.ᙠ⁚ᩨᩚḄ⊝:᝞ᩨᩚ-:F5+Ḅ⊝ᔣ⁚,ᐸᙠ⊝.ᩨᩚᙠ⊝ḄTᜐ.᝞ᡠ:ᩨᩚyḄ%W32cm,ᙠḄAᢞ3,"ᙳ30.5NḄ¡ṹ:ᙠḄB:ᵨ£¤E#¥¦ᩨᩚ:ᐸᙠ⊝:§£¤E#¥ḄᦪF3N.᝞¨ᢝBAª:£¤E#Ḅ«ᔣᔣ¬:ᩨᩚ®ᙠ⊝:ᑣ£¤E#¥Ḅᦪ5¯.°±21.%4/²ᑭᵨAஹB+ᱥஹµ¶·ᘤᩞ“#Ḅ¹ᵨᦔ»¼±½ᨵᐵ”Ḅst.᝞ᡠ.ᨔn%:st
%4¾¿ÀÁ____ᩭÃÄ#¹ᵨᦔḄ.ÃᵬÄᵬ.Æ+ᡠst:ÇÈᑮḄÉÊᙠ____./:_____Ëᜧ:#¹ᵨᦔË4.“#Ḅ¹ᵨᦔd#☢2ᜧ%Ḅᐵ'”:F¾¿ÃÄ____ᡠst.%4/²st5ᱥBÌÍΫᔣᑗᡂᜧ%A

5Ḅᙽ᝞ᡠ.ḄᵨᦔᵫḄ!"#$ᵨᦔ%&☢()ᐵ.+,-ᙠ/01234ᙠḄ5⚪#.ᨵ89ᐳ;<=ᜓ⌫@┴⍗CᑮEញGHIJKLMᵨ⌫@┴ᡭẚPᴻ⌫@-RST᧕ᡭẚPᴻ⌫@┴᜜WX⌱3Ḅ•%-⁚-ABCD22.]^_M`abcd3%eᐵḄ5⚪.(1)᝞ᵬᡠᙠᵨfghihjkḄlḄe3Ḅeឋ5⚪#.(2)᝞nᡠḄopq᠒ᦋtuv%w☢Ḅᜳya,Lz{ᑮ|}04Ḅ~ᔣ(⌱“ᦋt”ᡈ“t”)⌕~ᔣ#ᔣ`Ḅ!"XḄe#.(3)᝞ᡠḄ#“/0ᵯᜧḄ”ḄcdᵯᙠAஹ3ᣚḄᵯ¡XᐜḄe#,᝞z{ᑮᣚḄᵯ¤¥Ḅ¦§tᓄ©ªLcdᵯḄᨵᦔᦋ#.«ஹi¬⚪(ᜧ⚪ᐳ2⚪ᐳ13ᑖ)23.¯j-2ᓟ±Ḅ²³§ᓣµR50C.¶²ᔾᦈḄ¹j஺ᔾ.[c²=4.2xl(pj/(kg»c)].24.¼ᩞᧇḄᵯ¿ÀÁÂÃÄᐸᵯ&³§Æᜧ.᝞ᵬ#ÇȼᩞᧇḄᵯɳ§tᓄḄᐵÊË.ÌÍȼᩞᧇᵯÎᐭᵯ᝞nᡠÐÑᵯRo-10஺ᑣ(1)ÓÔ᛻³§-20CIᵯÖ⊤ḄØᦪ-0.2A,¶ᵯÚḄᵯ.(2)ᵯÖ⊤ḄØᦪ-0.4AI¶ÓIÔ᛻³§Â¼ᵯḄᵯÛ᳛ᑖÝ#Þß(3)ᵯÖ⊤ḄØᦪ-0.4AIàᵯ10ᑖá,Roâ@Ḅ¹j#Þßãஹäᔠ¿⚪(ᜧ⚪ᐳ3⚪ᐳ18ᑖ)

625.▅Øéᦻë_ᦻ¤Ḅ5⚪ᢥíîïᙠðñ@ò3oᨵókôᡈóôḄîõᐸîïö#ᢥíḄ᝞ᡠ஺ᢥíîïḄ÷øᳮ#úûᕖýô#þû“ᔾ”ÿᩭḄᨵᢥᔾ᪀ᵫஹ▀ஹஹஹ▀ஹஹ!ᡂ᝞$ᡠ&ᐸ▀(▀)ᛛᧇ,ᳫ▀./012▀./32஺5ᵨḄ7᎛9:ᔣ1ᢥᔣ1<=0>?5@▀ᐵB▀ᡭDEḄFGH᜜JKLD70ឮNOᩭḄPᯠR᝱5@ᔣ3<=▀ᐵB▀ᡭDFG9:▀ᐭᑮ஺V᪵ᙠᙊ31ZN[=\]ᙢ_F“ᔾ”᜜஺ᢥbḄcdOᳮ(______Oᳮgh»A.jklmnB.ᔾpᘤC.rsᓱu᫜wxD.yz{|>“ᔾ”3ᩭ)ᑭᵨ~.ᔣ1ᢥL7FG9:▀ᐭᑮ)______஺⌱“ᜧ/”ஹ“,/”ᡈ“/"᝞ᕒᙠ‧ᢥVbᢴ஺⌱“|”ᡈ“\|”26.▅~ᦟᩞ“Pᑴ”Ḅ᜜,wx,(,¡¢£¤¥1¦§.©⌱ª~¥ᵫ«ᱯᩞᧇᑴᡂḄᩩ¯°±FAᩭᑴd.,¡²ᵬ@AḄ³´12g,K¸¹ᙠ\h☢37,ᡠ»ᑮḄ¹¼N.10N/kg,Á▅~gᐵÂᧇ,ᙠ@ÃÄᩞᧇḄd~᝞$ᵬᡠ&Ḅ$Å,Æ$ÅÇÈÉᑮᐵ/¼Ḅ¥ÊËÌ.Í©ÎÏ4Ḅ³´ÇÈᙠ0-$ᵨ▢ÓÔᑖ☢Ö⊤&ᩭ,ØÙᙠ$ᵨÚÛÜV¥▢ÓÔᑖ.,¡ÝᵨᳮÞßḄ±à,ᙠA3᪗âᔜä.å⌱ª✌ᐜ᪗ânḄ,ᙠ²´AḄ°20cmd~᝞$êᡠ&Ḅ&ë$.ì:í,åî£n☢Ḅ.ïᙠð/3⊤☢᮱—cmᜐôd~᪗õ.o*=1.0X103kg/m3~ûüwx,Í©ýþᐭÿ
Ḅ᧕.ᙠ/Ḅ〉Ḅ!"ᶍ$%ᑴᡂ“*$”8.-.⏨0᝞

7§᪵,8ḄF4A/.3Ñ"Ò᪗Q,ÔÕFECḄf,ᱥᳮC.ᢥ᯿yÙ«Ú,+Ûᙠ6y᪗QÑஹ⏀ÝஹÞß·àFḄá:f,â᧕Ḅ¥äᑴᡂÑ.27.2015æ10ᨴ:ᡃéẆëḄìíî‷“ᙊñ”òó᝞ᵬ✌îᡂõ.î‷ö☠x#`ᓣᑮ20km-Ḅìí,ᐸøù'úᨵû□ᵯþÿ
.ᘤḄ‷Ḅᵨ⊝‷.“”!."‷Ḅ#$%&3xl
4m3,ᑣ‷ᙠ)*ᑮḄ,-&N./)01230.06kg/m3,g310N/kg
‷ᘤ40ᔣ6789ᔣ:Ḅ;<;‷ᡠ*0?@AḄᐵC᝞EFᘤḄGᦔ/GᦔIᢣᘤḄG᳛ḄLM!&0.01N/W,N)@A&40m/s‷ᘤḄG᳛&W.OὃQᫀSஹᓫ⚗⌱X⚪/Zᜧ⚪7⚪\⚪3ᑖᐳ21ᑖ!1ஹCூ(᪆௃ᨵᵨG&GH,"G1=aᑣᨵᵨG`a.bcdeḄG&f᜜G%5=6bX”FḄbcdiᜧf᜜GjklFḄmGjnoᦔ᳛p.QᫀAB┯C.rSscdtuvwrḄxᱥᨵᵨGwrf᜜G`rnoᦔ᳛wruᓣxᱥ{xnoᦔ᳛{|.D┯.2ஹAூ(᪆௃}⚪ᑖ᪆NᱥᜧᯖᡠᡂḄI᎔ḄᦑA᯿`nᡠᡂḄIᦑB┯Nᜮ6ᱥᜧᡠᡂḄ⌕ᦑC┯᯿`nḄᜮ`NᦑD┯⌱A.ூὃ௃ᡂ3ஹDூ(᪆௃

8Aஹ⁐ᐝḄ⁐I¡ஹ¢ஹ£¤¥⁐ᐝᦑA┯¦Bஹ§1Ḅ᪛©ª«¬jᙊ¯Ḅᐝᦿ±IᵫᐝḄ³´µ¶·vḄᦑB┯¦Cஹ¸¹º»ᱥḄ¼ᴻ¾ᜋ⌼ᡂᐝÁ±IᵫᐝḄ☢ÄÅ·vḄᦑC┯¦DஹÆÇḄᐝ´ᵫÈÉÅᑮ0Èᙠ☢ÊËᢚÅᢚÅÍᜧᐭÅÍᢚÅᐝ´ᐭÏÐÏÐÑ⌮ḼᢚÅᐝ´Ḅ7ᔣÔÕÖÑ×9ÆÇØÙ஺ᦑD஺4ஹCூ(᪆௃✌ᐜᑨÞcᱏᔣàáb,cb?ᘤ?MḄᓄ,᪷åæçèᑨÞᵯ¸ÈᵯḄᓄ,êëìᨩḄᓄ,᪷åU=IRᑨÞêëîïᵯðḄᓄ.ᵫEñêëcb?ᘤòὶNcᱏᔣàcbcb?ᘤḄ?Mᡠôᵯ¸ÈḄᵯᜧᵯ⊤Ḅöᦪᜧêëì᪷åU=IR,êëîïḄᵯðᜧᵯð⊤Ḅöᦪᜧ.ᦑ⌱C.5ஹCூ(᪆௃EøḄùú⊤ö$%ûú⊤öiAஹᵫEøñFᱥiḄ12Pz=?&=U^T=0-8g/cm3V᜛ᦑA┯¦V250cmBஹᵫEøñ$%&50cm3ḄFᱥiḄi&40g,ᦑB┯¦CஹᵫEøñi&25gḄᵬᱥiḄ$%&20cm3,ᦑCDஹᵫEøñNᵬþFîᱥiḄi`rFᱥiḄ$%ÿᜧ.ᦑD┯.6ஹCூ(᪆௃AஹᘤḄ┐ᜮᙠ☢ᩭᜧ!ḄᦑA┯"Bஹᵨᘤ$%ᵫ'()ᑮ+Ḅ,ᵨ-ᜧ./ᐵᦑB┯"Cஹᡃ23ᑮ4567Ḅ.ᕡ9:567Ḅᑖ<᡽ᦣᑮ4?.@Aᐭᡃ2ḄC

9ூ(᪆௃wᔠSR1-R3ὶᵯ⊤V1R1Ḅᵯᵯ⊤V2ᵯḄᵯᵯ⊤AlஹA2ᙳᵯ@Ḅᵯ9ὶᵯ@ᔜᜐḄᵯᡠᵯ⊤AiஹA2ᦪ:131,9ὶᵯ@ᵯN'ᔜᑖᵯNᡠᵯ⊤ViஹV2Ḅᦪ9=—=-—=,ᑣ&==RI=
X10Q=5CᔠSஹSiஹS2RiUV2/(&+&.(Rl+RJ322-R2¢ὶᵯ⊤A|᯿£Ḅᵯᵯ⊤A2¤ᵯᵯ⊤VஹV2ᙳᵯḄᵯ9¢ὶᵯ@Uᔜ£Ḅᵯᡠᵯ⊤V1ஹV2ᦪ:131,£Ḅᵯ%¦ᑖᯅ=39¢ὶᵯ@¤ᵯ'ᔜ£ᵯᡠᵯ⊤A1ஹA2ᦪ-4=33(42?*+4+©9ஹ«¬®ᢚ°⁐ூ(᪆௃
1᪛³ᙊµḄᐝᦿ¸'¹ᡂ»¼½ᵫ'ᐝḄ«¬®µḄফ¿ÀÁᑮ7@Ḅ¸'ᐝḄᢚ¼½"
3ÃÄÅ°Ḅ°⁐ÃÄḄÆᑖÃÄÇḄÅ°È᪷ÊÅ°Ḅ°⁐ÃÄᩭAËḄ.10ஹ᡽ᦣ%ᓄூ(᪆௃Ìộ⁐✏ᕡÏÐḄÑÒÓᑮ⚶ÕÖ✏×ØÙ9:ÚᡂᱥÜḄᑖ<ÃÝᙢ/ßᑣSL᡽ᦣ¼½"ÑÒÓÖ“á.ââ”á.7ä.⍗æ%ᓄµᡂḄ7ç஺V11ஹU=0.5—H+2VQூ(᪆௃ᵫ⊤èᦪÊuvU-Rᡂéêᦪᐵëuì:U=kR+b,íR=OQR=4஺U=2VU=4Vîᐭub=2,k=0.5,ᦑUïRḄᐵëU=O.5^R+2V.ூfñ௃ᑖ᪆⊤èᦪÊuvᵯᜧᵯNḄNôᜧὅᡂéêᦪᐵëìö⊤÷øᯠùîᐭᦪÊö⊤÷ø.12ஹ159ூ(᪆௃úûLiḄüᵯ=ý=Ì=14úûL2Ḅüᵯᐭ=þ===0.6,Ìíÿ
ὶᩭᵯḄᵯ-1OV-U9V2

1045670.6A,89LiḄ:=<===10஺89L2Ḅᵯ@=A=£=15஺CὶḄEᵯ@3R=/+R=10(1+15(1=25஺:ᑣCὶᵯGḄEᵯH3U=4H=0.6Ax25C=15V;ᑣP=U/=15Vx0.6A=9M13ஹIJK*L□ᵯNOூ᪆௃PQRᵫTᱥIJV:Ḅ-WXYZḄPQRᵫ-WXḄP[IJV:Ḅ\PQᐹᨵ_`ᱯឋQcஹK*ஹQ⁐efgḄ“hᜧ”RᢣPQhkᓽRᢣPQḄK*hᜧ\6mn:oᓄqorᵫ⚪tmuᨴᳫxḄL□6ᵯyz{L□6oᓄ|ᵯ6}x~J\PQ6⌴6mn⌴rJᵯRᵯNO⌴PQḄ.14ஹ7501.36X104ூ᪆௃muᴻᑁ☢ᑮ☢Ḅᚖ*|750mm,ḄᜧHkT750mmV:ḄHk\100mmV:ḄHk|3p=pg/»=13.6x1kg/m3xlON/kgxO.lm=1.36xlO4Pa.ூ᪆௃ᩭᱥᙽA¡Xzx¢£ᙠX¤☢¥ᔣ§ᒴ©ªJx«ᯠ☟®ᵫT¯ឋᩈᙽ±ᢝᩭḄ©*³´ªJᩈᙽµ¶TXzᔣ§·JᦈᑮXᔣ¹Ḅ᥅»¼\½ᩈᙽ¾ᔣḄ¿¼GஹXz¶ᔣ¥Àᢝ¼FḄÁᵨeÃ`¼R¢¶X⊝¼_`¼ḄÁᵨÅÆᙠᱥᙽḄ¿Ç¥.ூ᪆௃N┐N᩽ᔣ§ÊNËḄÁᵨÌÍmuÎÏḄ¹RS᩽§RN᩽ᦑᵫÑÒÓᑣmuᵯ4ᵫ¹Ô4ᐭᓽᵯÖ¹Ô|×᩽\᝞ᡠÙ3

11⚪ᐭ஺ᚖ☢Ḅ᪷ᢚ!ᜧᐭ!#ᢚᐝᓽ&஺᝞(ᡠ*:,ஹ./⚪(1ᜧ⚪ᐳ53⚪ᐳ20ᑖ)18ஹᵯ6ᵯ7Rs3ூ(᪆௃(1)ᵫᵬ(./:⍝<ᵯ6
ὶ=Ḅᵯ7>?᪷⚪@:⍝=ᵯA>?BCBDᴻFᑁH☢IJKᓄMᜧNO10Qᵯ6PQRḄSTUV⊤OXᙠᵯ7>?ஹ=ᵯA>?ḄZ[\]^Ḅᵯ6_ᜧQRḄST_U.(2)(abᘤdbᘤ?=ᵯA>uᡠva(Ḅwx&vᵨᩭẆ{ᵯ6PQRḄSTiᵯ7ᜧ3Ḅᐵ}~ᙠ./ᑮjஹduNO?ᵫ<ᵯ6Pᜧ3=ᵯA>?ᵫᵨ:⍝=<ᵯ6PḄᵯ7>?ᓽtᵯ6Pg~(3)./COᑣdbᘤᵯ6PQRST3kᵫ஺=4:⍝=dbᘤᵯ6PḄᵯ73k᪷
ὶஹfὶᵯᵯ7Ḅ:⍝=Ḅᵯ7ᜧkᵫfὶᵯᵯḄ:⍝ᣚᡂᵯ63Ḅᵯ6.19ஹ1204ᡂ£¤¥ᐵ1000.6ூ(᪆௃(1)ᵫP=/^஻:⍝i§ᡂ£¤ᵫ⊤A¨./ᦪ:⍝ªḄ«T¬180g-60g=120g,bᘤᑁªḄ®J¬6cm-2cm=4cm¯°±ᘤ*ᦪ¬600Pa-400Pa=200Pa,ᡠv²¯t400PaªḄ«Tt120g,bᘤᑁªḄ®J4cm

122
ᑖ᪆¤M⊤AB./ᦪ:⍝®J_®¯_ᜧᓽª´bᘤµḄ¯iªḄ®Jᡂ£¤iª¶ᑮḄ·¸ᜧ3¥ᐵ~3
᪷⚪@²¹ᐭ180gḄªgº»¹¼Bbᘤ²¹ᐭ180gḄªgAbᘤᑁªḄ®J6cm,½¾k.ᳫÀᐭAbᘤ.ᳫÁÂᙠª☢ê☢º»ÃᓣᑮbᘤÅᡠvª☢ÃᓣḄIJtX஻=8cm-6cm=2cm,ᦑ.ᳫÁÂᙠª☢öᑮḄ¸tXF
=Pghsজ½¾.ᳫᐰÉᐭª᣸40cm3Ḅªᡠv¶ᑮḄ¸tX=᜛ª8%-40cn?
ঝᵫজঝÍÎ.ᳫḄ^ÏtXV^lOOcm3½¾.ᳫÁÂᙠª☢öᑮḄ¸tXQÂ=஺ª==0ᳫgVᳫᦑÍÎX"Ñ=0.6g/cm3஺20ஹdÒÓT¸Ô1.2ᜧ¸ÔK3ூÍ᪆௃1
ᩨᩚdIjÙ¾ᩨᩚᙠªÚÛxÚ⊝&vjḄÚ⊝ÝÞᔣdàᡈὅdḄÚ⊝ÝÞᔣdàãsᔣdàäà⁚ᩨᩚᙠªÚÛxÚ⊝¾æÒÓT¸Ô.2
¾Fili=Fh,2ᡠvF1x10cm=3x0.5Nx8cm,ᡠvFi=1.2N.᝞çèᢝBêëìíÓ¸Ḅîᔣᔣdïð¸ÔKñᩨᩚòᙠªÚÛxÚ⊝ᑣìíÓ¸óḄ*ᦪKᜧ.21ஹôõḄö◍øJùú☢ϸᵬûüᨵþᑴ
Dூ᪆௃1
ᱥᱥḄᜧ
Ḅᵨᦔ!"#$%&'Ḅ(◍*+ᩭ-.
ᵨᦔḄ.2
ᵫ1ᵬஹ4ᡠ67ᑴᱥ9Ḅ:;☢=>
?
Ḅᵨᦔ?ᵫ@ABᙠ:;☢=D
ᜧ
ᵨᦔ.3
EF“
ḄᵨᦔHI
☢=ᜧḄᐵK”M7ᑴ
>I
☢=?M"#-.1ᵬNOᡠ6.4
PᱥBQRSTᔣᑗᡂᜧ?ḄXᙽᱥ9Ḅ:;☢=Hᱥ9Ḅ
Zᓄ\ᨵ7ᑴᱥ9Ḅ
^ᵫ@A_Ḅ`a!┯cḄ.5
defg᧕ᡭẚkᴻMᱥḄ:;☢=ᵫ1ᡠ6m⌫┴᜜M⌱1ḄDᦑsᫀd1
&'Ḅ(◍*+;2
:;☢=v
v3
ᵬvOB4
\ᨵ7ᑴ
v5
D.22ஹᵨwxyz
{|᪥~“0”?04,$%ᳫTᔣᐵᙠᵯὶᵯ⊤ூ᪆௃1
1ᵬᡠ6Ḅxyz
{ᢣ┐?ᙠ\ᨵ?ᵨᩭz
Ḅᜧ◤⌕ᐜv2
d
ḄTᔣ!RSᔣḄᡠOAᵫI
ḄᵨᢝRSTᔣ?v0A,$%ᑮᳫḄTᔣ¢ᳫᙠRSᔣḄ
Ḅᵨ£RSᔣ¤¥.

13(3)ᣚ:?Ḅᵯ§¨©wMᵯᐵvᣚ:?Ḅᵯ§¨ª«Ḅ¬+ᓄ?ᙠᵯὶᵯ⊤$%ᵯḄᓄ.ஹ{®⚪(±ᜧ⚪ᐳ2⚪ᐳ13ᑖ)23ஹ4.2xlO5Jூ(᪆௃µᔾᦈḄ¸0ᔾ=cm\t=4.2x103J/(kg-࠷)X2kgX50࠷=4.2X1OSJ24ஹ(1)12V(2)1.2W(1)962Jூ(᪆௃¹⚪ᑖ᪆B(1)ᵫ14mº+d22࠷D»¼ᵯ§d52஺ᡠᵯ¾ᵯU=1(¿+&)=02Ax(50Q+10Q0=12Vvu12r(2)Ãᵯ⊤6ᦪd2.4ADᵯᵯ§¿'==±ᓃ=30Q,ᑣ»¼Ḅ§Édr04ZÊ'=¿'-&=30Q-10Q=20Q,᪷Í14m»¼§Éd22஺Dº+d42࠷,@D»¼ḄᵯÎ᳛P=r2Rf=(0.4A)2x20Q=32Wv(1)ᵯ⊤ḄÐᦪd2.4AD"ᵯ12ᑖÑR2ÒḄ¸஺=Òᓽ=(o_4A)2xioQx6OOs=96OJ.ὃBÕÖ×ØḄMᵨᵯÎ᳛Ḅ{®ᯖὡ¸Ḅ{®ÛஹÜᔠ
⚪(±ᜧ⚪ᐳ3⚪ᐳ18ᑖ)25ஹAᜧÞᜧூ(᪆௃(1)ᢥàáàᑁÞãäåᜧᜧ᜜æᜧÞçèéᙠᑁ᜜ÞêḄᵨã“ᔾ”ᩭᑭᵨḄ!ᜧÞ஺AஹᙠìíᔾîµḄ#*ᢴ_ðᑁñÞòèªðᑁÞ᜜æᜧÞîµᙠ᜜æᜧÞḄᵨᐭðᑁôᔠ⚪õvBஹᔾöᘤᙠøDᵫù¥ḄᡧûᜐÞḄýᜧåþ>ᙠᕜᜧḄᵨᮞஹᚗ“ᔾ”ᐭᔠ⚪Cஹᓱ᫜!"#ᑭᵨ%&'()*+Ḅᐵ-)ᜧ.ᐵᔠ⚪Dஹ/01#2)/0Ḅ3ᔠᙠᔾ5678ᔾᐭ/93ᔠ:;<=>?@ABᑁDEFEḄ'ᵨGHI⚔KLMHINOPQRMSTUᩚஹWXYZ1᪀\᜜^_1`D)ᜧ.ᐵᔠ⚪

14t\(2)ᵫ(1)muàáâ6ã“ᔾ”¥ᩭRᑭᵨᜧH\(3)ᔣᢥHçèáâéêâëâ▀íëᐭᑮîâïgðñHᜧTîâïH\(4)|Lò‧ᑁôᨵòõeöñ÷àáâñøRᑭᵨᜧHùÁḄᡠn᝞úûüᕒᙠLò‧ᢥHeöñ÷àáâñø6ᢴÿ
஺W(g.cnr')26ஹ0.128BḄ(ᡈ)10203040ூ᪆௃⚪ᑖ᪆(1)ᵫᱥḄᩩF=G=m=12xl0-3kg/m3xl0N/kg=0.12N(2)ᵫᱥsgAḄ!pA=0.6g/cm3,ᵫp=20cm3ᙠᵬ$%&᝞(ᡠ*(3)+ᱥAḄ,☢./s,0ᐭ2$Ḅ3!/h44ᑣ᣸72Ḅ./Vxsh44ᱥḄ.8ᱥ=$11,ᱥA;4ᑣᨵGA=F4ᵫ=>?@AᳮCFxp2gVᢝ=p>Kgsh44EᵫG=mg,p=m/V,C4G=pᱥgVᱥ=pi^gsh,ᡠGp2gsh4=p»,gsh,ᓽh,=12cm,2☢IJᙠKA(⊤☢h”=20cm-l2cm=8cm(4)“!N”BḄPᜧ4᪷S;ᩩT=>?@Aᳮ4GA=F=P*gV»,ᱥsPᜧ4Uᐭ$V᣸72Ḅ.WGXPᜧ4YZ[\4]^_`abᜧ4ᡠG⌕d]BḄ(ᡈ)4d᪗f!^.ὃi!ᱥḄᩩ27ஹj1.8X10kḄlᵨnopḄ1.44X10%ூ᪆௃(1)q‷stᙠuv(4᪷Sᩩ4wxvyᑁḄv!_‷᜜Ḅuv!jq‷᣸7uvḄ.|vy.o4ᓽV᣸=3x1013,}1q‷ᙠ~ᑮḄ/=᜛urgV᣸=O.O6kg/m3xlON/kgx3xlO4m3=1.8xl()4N.(2)ᱥḄlᵨnopḄ4ᡠGᘤuvᔣVsCᔣXḄ4q‷ᵫ42ff720Nq‷ᑮḄ|Ḅ~ᡂ_,+Av,ᑣ,$(800,720)ḄiᐭC:k3=——-[^=0.9N/v2v2800(m/s)2(m/s)2,ᑣq‷ᑮḄ|Ḅᐵ¡//=0.9N/(m/s)2v2,¢/v=40m/s£ᑮḄ//=0.9N/(m/s)V=0.9N/(m/s)2x(40m/s)2=1440N,¤£q‷4ᡠG2~ᔣ(4ᓽ4M440N.pp1440NᘤḄ¥ᦔ/==0.01N/W,ᑣq‷ᘤḄ¥᳛/P=-............=———=1.44xlO5W.0.01NAV0.01NAV