2022-2023学年安徽省巢湖市名校物理九年级上册期中经典试题含解析

《2022-2023学年安徽省巢湖市名校物理九年级上册期中经典试题含解析》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。

2022-2023
ᱥᳮᔁὃ1.ᵨ2B⌱⚪ᫀᙠ⚪
!ᵨ0.5"#$%
&⁐()Ḅ+ᡈ-(./⚪Ḅᫀᑏᙠ⚪Ḅ⚪1ᑁ஺ᑏᙠ⚪ᔁஹ₝6
ᙳ8ᦔ஺2.⚪:!;<▅>⚪
Ḅ?@⚗B!ᢥDE⚪஺Fஹ⌱⚪1.ᐵHIJஹKLMᑁN!OᑡQRSTḄUA.ᱥVḄᑁNWX!IJFEᓣZB.ᱥVIJᓣZ!FEᔾᦈ^KLC.ᱥVIJ_`!ᑁNFEabD.ᱥVᔾᦈ^KL!IJFEᓣZ2.Fcdeᘤg᪀᝞jᡠl!mno┐qrstᱏPA.vᵯxyzAஹC{z|}o,ᵯedB.vᵯxyzAஹB{z|}o!ᵯedC.vᵯxyzAஹC{z|}o!ᵯedᜧD.vᵯxyzBஹC{z|}o!ᵯed3.᝞jᡠlḄᵯxj!ᵯᵯᢝd!ᔠᐵS!stdeᘤ&Ḅsᱏᔣst!OᑡQRSTḄUA.ᵯ⊤Viᵯ⊤V2ḄlᦪMdB.ᵯ⊤V2ᵯ⊤AḄlᦪdC.ᵯ⊤AḄlᦪd!ᵯ⊤ViḄlᦪdᜧD.ᵯ⊤AḄlᦪd!ᵯ⊤ViḄlᦪd4.LḄᙽᵬஹஹXKᑮḄIJ!¡ᑮ⊤☢£᦮¥∑
.¨©ª«¬o!/®ᑮḄ¯°᝞jᡠl.ᑣᙽḄK²

1LS∑A.ᵬᨬᜧB.ᨬᜧC.ᨬᜧD.F᪵ᜧ5.Oᑡ¯°!µ©¶·Ḅ¸RWᜧᱥVᑁNḄUA.ᵨK¹º»ᨨB.F½¹᠒᠒d¿C.ÀÁÂÃᡭÅ!ᡭÅÆÇKD.ᨨÈÉÊË6.Ì^ᦋdF᪷Ï|ᵯeḄᜧ!Oᑡ¸RÐENÑᑮÒḄḄUA.ÀÏ|XKB.Ï|ÓᢚÕᵨC.Ï|Ö¬ÕᵨD.ᦋdÏ|Ḅᵯ7.᝞jᡠl!ᔠᐵ!×⁚sᱏP,Õ{ᵯ⊤ᢣ┐ᡠᢣ.OᑡQRSTḄUA.ᵯ⊤%“lᦪÌ15B.µ©{ᵯeᵯ41C.RoR{}ᵯÌ15D.RoRḄeÌ148.ᑭᵨÇᐝÞ᩽àáâLEDᑴᡂḄåæᙠçè
K├!êëµ⁚NåḄÇᐝᦔ᳛íZ.ᑴîÇᐝÞ᩽àḄᩞᧇUA.ñÏVB.òÏVC.ó#ᩞᧇD.ôõV9.Oᑡö÷øÊ!HùúNrᓄÌᑁNḄUA.üýþÿ
ᓣB.
ᑁḄᓣC.ᜩ
ᙠ□ᐝᑮᨨD.ᵨ┴᦬!ᜮ
!ᜮ┴#⌕%10.&'()ᑮ*+,-.
/0123045ᑮ64
ᡠᵨ8910s.:;/*4<=>
?@ABCDEFḄF᳛ᨬIJ☢:LM

2A.3WB.30WC.300WD.3000W11.OᵬQRஹTCUVW
XTYὅᙠ[☢*
\A]^_RTC.ᵯbcᳮ᝞Ofᡠ_
ᵯg⊤ஹᵯi⊤ᑖk^_RTCḄᜧm
gnᵯoRḄoMpgDqᜧqᜧ
rᱏPpRq*r.ᑡᑖ᪆vwḄQ()A.Rzᵯg⊤_ᦪᜧB.RzḄᵯiQA,L2>ḄᵯiQA,15.᝞OQ&ᱥ´ᵫ¶᝱¸9¹᝱<=p8¸ᓄḄOº
ᵫO»¤¼G½ᱥTᑖ¾¿]\½ᱥTᑖ¾¿]\
t½ᱥTᑁ\½ᱥTᑁ\(ᙳ⌱2“ᜧÔஹ“mÔᡈ“ÆÔ)

316.ᵯ]AÇÈḄÉᵯÊᐙᵯQᵯ\ᓄ9\
XÌÍÎÏÐÑÒÓ᥅ÕᑖkÖ*.ÆVḄ×}ᵯ₹
ᐸ>ᜫÚᵯ¾ḄQ஺6ஹÛÜ⚪17.(8ᑖ)ᵨOᵬᵯbÝÞ“ᵯißᵯoḄᐵà”
ᵯᵯgឤ93V,r]¸oᘤãä9“50C2A”.(1)åᵨæçèéêè
ëOᵬ>ᵯg⊤Iᐭᵯb
URḄᵯg();ফrᱏPïᑮoMᨬᜧᜐ
ë5஺ᵯoIᐭᵯb
«ᔠᐵ
ïᑮrᱏP%ñ¼ᵯg⊤ᨵ_ᦪ
ᵯi⊤óôõ_ᦪ
ᐸcö»\Q⌱÷ø)AஹᵯoRùbBஹᵯoRúbCஹr]¸oᘤùb(3)᣸◀ᦑþÿ
ᱏPᵯ⊤Ḅᦪ᝞ᡠᵯ⊤Ḅᦪ(4)5Qᵯᣚᡂ10஺ᵯ,ᢝᵯ⊤ᦪ,ᱏPᔣ(⌱"“4”ᡈ"5”)$
(5)%&'()ᙳ⌱ᵨᓫ-./ᵯ0ᐭᵯ2()3ᨵ“15஺20஺30Q,35Q,50C”5-ᵯ56ᐸ89:;<()Ḅᵯᨬ>?ᨵ-ᑭᵨB⌱ᵯ;<()CᑮEF—18.(8ᑖ)JKஹJMஹJNOPQRᙠᱥᳮ()VW“Yὶᵯ2ᵯ[\”^_`a஺(bcdᎷf)Yὶᵯ2gᵯhiᔜᵨᵯᘤl$Ḅᵯmn(1)ᢥᵯ20pᵯ2;(2)rᔠtᐵᵨᵯ⊤vwLl$Ḅᵯ;

4(3)ᙠvL2l$ḄᵯVJKQRx⁚ḕ()V{|ᵨ}~ᵯ⊤ᡠpḄBptApᦋpᑮCp஺(4)vwAC{Ḅᵯ.(d)(1)ᙠ0pᵯ2Vtᐵ:(2)JKᵨ☢Ḅ~9vwL2l$Ḅᵯᳮᵫ(3)~ᦋ^ᡠvwA5ஹBCஹAC{Ḅᵯᙠ☢⊤8.JKQRᙠ-()f~ᫀ?ᙠḄmᜐ;UAB/VUBC/VUxcTV2.01.83.8(4)JMQRᙠᵨᵯ⊤vᵯVᵯ⊤ᢣ┐&'ᙳ¡JᵫiAஹᵯ⊤¢ᨵὶᙠᵯ28Bஹ“+”ஹp¤¥p¦Cஹᵯ⊤§¨⌱©ªᜧDஹᵯ⊤§¨⌱©ªJ(5)JNQRᢥᵯ20pᵯ2rᔠtᐵ¬L2®¯1“®¯ᵯ⊤Ḅᦪ0,⌼ᡂ±²B9Ḅ³´.19.(8ᑖ)ᙠ`a“ᱥµ9ḄᜧJd¶·´¸ᨵᐵ”Ḅ()8J¹QRfx᝞ᡠᵬஹஹ»O'()¼½ᳫ¿QÀÁ☢Âᜐᵫ☟ÄtÅᔣÆᯠdÈᙠÉÊ☢ḄËÌÍνᳫdËÌᙠÉÊ☢ᐳQ
ÀÐÑÒ☟Ä.(1)⌕`a9ᜧJdᱥµÔ§ḄᐵÕ,⌱ᵨl;()8ÖÍQ.x×ᑮÀØḄᡠ|ÙḄᐹµÛÜ~.(2)⌱ᵨᵬஹ»l'()B}CwḄEF.(3)±()ÝÞßàᩭâã½ᳫ9ḄᜧJ¿äCwEFḄ.(4)%ÉÊ☢åWᐝ½ᳫçÆ.èஹÜ⚪20.(8ᑖ)ê5ᙠ☢Ḅ(ᱥë0pÀ᪷í¤ᵯ⊤9îvwLl$Ḅᵯ.(⌕ïᵨð⌕0pḄí¤ñwí¤òó)

521.
8ᑖô
1᪷õᵬᡠḄᵯ2ᙠḄ(ᱥᵨðñw0¤.
2ᙠrᔠtᐵ᝞öᵯ⊤AiḄᦪ0.5A,ᵯ⊤A2Ḅᦪ0.3A,ᑣÝÞJ®øLiஹL2Ḅᵯᑖù>úûüýஹþ⚪22.
10ᑖôJÿ
ᨵᐵḄ⍝Ḅ4.2xl
3j/
kgC.প᝞ᵨᮤ0.005n?Ḅஹ20࠷Ḅᑮ100࠷,ᑣ◤⌕ᔾᦈ%&'(ফ*+ᵨḄᮤ,ᵨḄ-4.2xlO7J/kgḄ᯼/ᮤ+0Ḅᦔ᳛3ᦔ᳛45ᔾᦈḄ'6ᧇ8ᐰ+:;Ḅ'<=20%,ᑣ>▭@ὑḄ᯼%&ᓟC(ব⁚FGHIᮤJKᦋJ,ᮤḄᦔ᳛MᑮNO.*ᙠR᪵ḄᩩUV0.005n?Ḅஹ2
࠷Ḅᑮ10
࠷,WXᩭ⁚ḕ0.04kgḄ᯼ᑣ[ᙠᮤ+0Ḅᦔ᳛%&(23.
12ᑖ=ᵯ^Q`&bὶᙠᵯHᵯdឤ6VḄᵯfghᵯ^Ri=4Q,ᵯ^RiijḄᵯd2V,klRigḄᵯm`ᵯ^&Ḅ^-.nὃpᫀrஹ⌱t⚪1ஹC

6ூ᪆௃A.ᙠᨔxᰚᓄḄ{|g}ᯠᔾᦈ'ᑁGᦑA┯B.`⌴WᦋᱥxḄᑁG*ᱥxḄᓣOWGᔾᦈ'WG᜜IᦑB┯C.I5RrᱥxᩭᐸᑁGr&ᦑCD.ᙠᨔxᰚᓄḄ{|gᱥxᔾᦈ'ᦑD┯஺2ஹBூ᪆௃^ᘤ☠ᦋᐭᵯfgḄᵯ^¡Ḅ¢ᩭᦋᵯ^ḄḄ£¤“r¦rV”.ூ௃AC.¨ᵯf£AஹCi£©j0᦮«ᵯ^¡£ᐭᵯf¬ᱏ®¯ᵯfḄᵯ^ᦑAC┯B.¨ᵯf£AஹBi£©j0¬¯ᱏ°±0┐³ᔣµ¯0ᐭᵯfḄᵯ^ᱏḄ¢ᓽᵯ^ᦑBlD.¨ᵯf£BஹCi£©j0¬¯ᱏ°±0┐³ᔣµ¯0ᐭᵯfḄᵯ^ᱏḄ¢ᜧᓽᵯ^ᜧᦑD┯.ᦑ⌱B.3,Dூ᪆௃ᵫᵯf¹WR6/?2bὶᵯd⊤Vl»ᵯHḄᵯdᵯd⊤V2»&ijḄᵯdᵯm⊤»ᵯfgḄᵯm஺᪷½ᵯHḄᵯdWᵯd⊤Vl¾ᦪḄᓄ᪷½¬ᱏḄ®¯W£ᐭᵯfgᵯ^Ḅᓄ᪷½ÀÁÂWᵯfgᵯmḄᓄ`ÃijḄᵯdᓄ᪷½bὶᵯfḄᵯdᱯÅWÆijḄᵯdᓄᯠᑨÈᵯd⊤Vl6ᵯd⊤V2Ḅ¾ᦪ<`ஹᵯd⊤V26ᵯm⊤AḄ¾ᦪ<Ḅᓄ஺ூ௃C.ᵫᵯf¹W6Ébὶᵯd⊤V1»ᵯHḄᵯdᵯd⊤V2»ÆijḄᵯdᵯm⊤»ᵯfgḄᵯm஺ÊᵯHᵯdËᢝᡠ¬ᱏ®¯0ᵯd⊤V1Ḅ¾ᦪᦑC┯D.¬¯^ᘤ&Ḅ¬ᱏÎᔣϬ¯^ᘤ£ᐭᵯfgḄᵯ^ᜧᵯfgḄÐᵯ^ᜧᵫ/=WᵯfgḄᵯmᓽᵯm⊤AḄ¾ᦪᦑD

7A.ᵫ஺=ÓWÔijḄᵯdÊbὶᵯfgÐᵯd45ᔜᑖᵯd<`ᡠrijḄᵯdᜧᓽᵯd⊤V2Ḅ¾ᦪᜧᵫᵯd⊤V1Ḅ¾ᦪஹᵯd⊤V2Ḅ¾ᦪᜧWᵯd⊤V16ᵯd⊤V2Ḅ¾ᦪ<`ᜧᦑA┯B.ᵫᵯd⊤V2Ḅ¾ᦪᜧஹᵯm⊤AḄ¾ᦪWᵯd⊤V26ᵯm⊤AḄ¾ᦪ<ᜧᦑB┯஺ூÅ×௃É⚪r⍝ÙᐺḄ¯᝱ᵯfÜᔠឋ⚪ßÅὃàᵯfḄ¯᝱ᑖ᪆ÆÀÁÂḄâᵨᙳgὃᱥᳮᵯåᑖḄßæÅ◤⌕çèéêëìᐵíJKÜᔠâᵨᑖ᪆஺4ஹCூ᪆௃îïᙽñV³Ḅò∑ᰚᓄôõîïᙽñ:;Ḅ'%ᵬஹ÷ஹñḄøஹùì4Ḅᓄ-úìRḄ᪷½ûüQxcm(t-to)Wlᵬஹ÷ஹñý«îïᙽḄþ'ஹḄᓄ-ì4Ḅîïᙽñ:;Ḅ'%ᡠîïᙽñḄÿᜧ.5ஹCூ᪆௃A.ᵨᨨ⌴ḄᜧḄᑁᦑAᔠ⚪B.᠒᠒!"⌴Ḅ#$ᦣ&ᑮ()*+,ᑁ-.ᦑBᔠ⚪C./+01ᡭ)3456()789ᐸᑁᜧ;<ᓣ>ᡠ@ᡭ)ABC&ᑣEFḄᜧᑁᦑcᔠ⚪D.ᨨGHIJKLGᑁḄ)7MHIḄNᵨOPQᑁRᓄTUVᑣEEF-.ᑁᦑDᔠ⚪.6,Dூ᪆௃ᵫQX7ᵯZX7[,Ḅ\ឋ^ᐸᜧ.ᵫX7Ḅᩞᧇஹa<ஹbc☢8efghX7Ḅ;<ᨵᐵkhX7lmḄᵯ5nX7ḄᵯopᐵkA⌱⚗ᦋ!X7Ḅ;<B⌱⚗6tX7Ḅa<ஹᜧbc☢8C⌱⚗ᜧX7Ḅa<ஹ-.bc☢8D⌱⚗uᦋ!X7Ḅ*Ḅᵯoᡠ@D⌱⚗ḄvwᑮxḄ.ᦑ⌱D.7ஹDூ᪆௃᝞zf{ᵯZ|}~!ZᘤὶᵯoᜐᜐᦑB┯;

8ᵯ5⊤Vi$ᵯ5V2$f{ᵯZR஺Ḅᵯ5Tᵯ5⊤ᜧ$.$Ḅ5ᓽ%|%ᦪT51,ᦑA┯Ro|Rlmᵯ5T1
5-1=14,ᦑC┯ὶᵯᵯo᪷=,ᓽὶ*ᔜὶᵯZḄᵯ5U4]QᵯZḄᡠ@R஺|RḄZ{T14,ᦑD஺⌱D஺¡ὶᵯḄᵯ5nᵯoᱯ£¤¥¦§ὶᵯḄᑖ5ᱯὶᵯḄᵯoᜐᜐ᪷©/=஻?ᵯZ®ᜧᑖᵯ5®3ᓽᵯ5|ᵯZᡂḄ஺8ஹBூ᪆௃LED⁚±Ḅ᪶³ᐗµ&ᐝ·᩽¹k·᩽¹ᵫºX7EᡂḄᘤµᦑBᔠ⚪஺9ஹDூ᪆௃A.»¼½¾ᓣ(k¿½ᧇ½ÀḄᑁRᓄT»¼ḄUVᦑᔠ⚪B./ÀÁ9ᑁḄ;<ᓣ>⌴ḄÁᱥ7Ḅᑁᔠ⚪C.ÃᜩÅÆᙠ□ᐝÉÊᑮᨨn⌴ḄÁᱥ7Ḅᑁᔠ⚪D.ᵨ┴᦬ÍᜮÍᜮn┴Ï⌕&EF9ᐸ;<ᓣ>ᑁÁPQUVRᓄTᑁᔠ⚪஺10ஹCூ᪆௃ÑÒḄÓÔ^$ᜧᭆT50kg,ᑣ¡OG=mg=50kgxl0N/kg=500N,Ö×ØᑮÙ×Ú▭uØlÜ>ÝÜᜧᭆ>3Þᱥ7ᙠßàᔣâãä¡OEFW=Gh=500Nx2x3m=3000J,F᳛P=W/t=3000J/10s=300W»11ஹAூ᪆௃AB.ᵫᵯzæçR|Roèὶᵯ5⊤}ᱏPÉᵯZêlmḄᵯ5ᵯo⊤5ëᵯZRìḄᵯoᵯ5⊤ḄᑁZíᜧஹᙠᵯ*îQïᡠ@ÅḄ,>!ᓄᓽ}ᱏð~¾/ñᐭᵯ*ḄᵯZ!èὶᵯ*ᔜìlmḄᵯ5

9óᔜìôõöNஹ÷øùᡠ@ᵫ/=æçRoḄᵯo!ᦑB┯î,>®>¾}ᱏâð}ᱏPÉᵯZêḄZ{!ᜧᵫ஺=.æç}ᱏPÉᵯZêlmḄᵯ5!ᜧᓽᵯ5⊤Ḅᦪ!ᜧᦑACD.î7¡®ᜧ¾5ëᵯZúᑮḄ5O®ᜧᵫ5ëᵯZRḄZ{û5OᜧkᜧæçRḄZ{®ᜧᵫ/=|æçRḄᵯo®.ᓽᵯo⊤Ḅᦪ®.ᦑC┯5ëᵯZKlmḄᵯ5!üQᵯýᵯ5ᦑD┯.12ஹCூ᪆௃&ᐝ·᩽¹\þ᝱Ḅ
ᘤᦔᵯᓄᐝᐹᨵᓫᔣᵯឋ,LEDḄ
Ḅᨔᱏᨔᱏᵫ
ᩞᧇᑴ$%ᡂ'(ᑖ*▬ᙠ-./(0᩽2(3ᵯ4Ḅ5᩽.7᯿ᔜ⌱⚗C<ᔠ⚪?⌱@C.Aஹ@C⚪13ஹᑁE4.6X106Jூ᪆௃[1]GHIḄJKLMNᧇᰦPឋNQRSᑁETUIVEW[2]᪷Y஺="]^ᑮGH`ᐰNQRSḄbcdQ-mq=4.6x107J/kgx0.1kg=4.6xlOfiJ(.14>e0.70.9ூ᪆௃পফবiᐵSkᔠ'lmeὶᵯo⊤AiqḄrsᵯoᵯo⊤A2qḄtuL2Ḅᵯoᵯo⊤A2Ḅvᦪ0.9A,L2xḄᵯo0.9A,ᵫeὶᵯsᵯoḄyz{tuLiḄᵯo//-/=1.6A-0.9A=0.7A1=215ஹᜧ}ᜧ}ூ᪆௃~J~ᡠ~ᱥᑖE4~ᜧW[2஻2ஹ4~ᙠuMxᱥSbᑁEᡠ~ᱥᑁEᜧ}~ᱥᑁE.16ஹᓄ

10ூ᪆௃[1]ᵯᵨḄᵯᐙᵯḄᓄᵯ4¡¢ᐙᵯ~£¤ᵯEᔣᓄEḄᓄWফ¥¦§¨᥅ª~¥¦§«0ᵯ«5ᵯᵫ}Ḅ¬᪶®¯ᵯḄE°±²ᜫ´ᵯ%¥¦§Ḅ¬᪶®¯ᵯḄE°±µ^ᑮ¶ᵯ஺·ஹ£¸⚪Ḅᵯoᵯ¹ᡂº.ூ᪆௃ᵯ4ᵯ»ឤ3V,ᦑᵯ»⊤ḄcM0-3V,ᵯ»⊤ᵯ¹Reὶ᝞¿ᡠv:(2)[2]A.ÁRÂsᑣᵯ»⊤Äeὶᵯ»⊤Åvᦪ%ᵯs3tᵯo⊤ᨵvᦪᦑA<ᔠ⚪?WB.ÁRsÆÇᵯ»⊤ÈὶᙠᵯsxÉᵯ»⊤ᑁ¹Êᜧᡠᵯo⊤Åvᦪᵯ»⊤ᵯ43tᨵvᦪᦑB<ᔠ⚪?WC.Ë̹ᘤsÆÇ᦮ᵯss'⊤ᙳÅvᦪᦑC<ᔠ⚪?W(4)[3]᪷YÏᑴÌcÐẆÒᵯoᵯ¹ḄᐵÓ~⌕Õᢝ×Øᵯ¹Ḅᵯ»ÌWᣚᡂ10஺Ḅᵯ¹ÁËᱏÚÛ᪷Yᑖ»¬ᳮ{×Øᵯ¹'(Ḅᵯ»ÆÌᜧ,Õᢝᵯ»⊤vᦪÌᑣ]×Øᵯ¹'(Ḅᵯ»ÝÞË̹ᘤ'(Ḅᵯ»ÝÞ̹ᘤᐭᵯsḄ¹ØᦑËᱏ]ᔣA(àW(5)[4]¿xᵯ»⊤cMᑖØ0.1V,vᦪIVÏᑴᵯ»IV,Éᵯ4ᵯ»3V,ᦑË̹ᘤḄᵯ»d3V-1V=2V,᪷Yᑖ»¬ᳮ{dIV7?Iv-5OQ'

11á^:R=25£l,ᦑ×Øᵯ¹Ḅ¹Øᨬᜧ25஺ᦑ15஺ã20QḄäᵨᦑäᨵ2ᵨWমᑖ᪆⊤xᦪYᨵᵯ¹¬ᩭḄèé~tuḄᵯo¬ᩭḄèᑖêᡠ^ëḄìíd'(ᵯ»×~tuḄᵯoᵯ¹ᡂº.18ஹiᵯ»⊤50Äïð¶ñ£¸ìíᐹᨵᱏ☢ឋCLiÂsூá᪆௃ᙠõᵯs~iᐵö÷i஺(2)[2]ᵯ»⊤8øïiAøeᦋᑮCø/~úᯠᵯ»⊤ü~L2eὶᵯ»⊤Ḅ50ÄîᓾºḄkᔠiᐵþᢣ┐
ᔣᡠL2Ḅᵯ஺(3)[3]ᨵ!"#$%ᦪ'()*+ᨵᏔᯠឋ(/012஺(4)[4]ᵯ⊤ᢣ┐567ᙳ9:;ᵯ⊤ᡠ⌱#=>ᜧC/0஺(5)[5@2ABᑣᵯDEFGHDLiABᵯ⊤ḄIᦪJ0,ᑣKLiLD஺19ஹ(1)ᵬஹOPQᳫSᑮUV☢XḄY6PZ[#\Ḅ]Qᳫ^\_6☟@SaP(2)[#bcḄᱥefgY6hᜧiᐹᨵḄghᜧP(3)klmngḄopḄᜧP(4)ᒴYrsூu᪆௃x⚪ᑖ᪆{(1)⌕}~gᜧᱥe[#Ḅᐵ⌱ᵨᵬஹOPQᳫSᑮUV☢XḄY6b\Jᑮ:ḄᡠḄᐹeZ[#\Ḅ]Qᳫ^\_6Sa.(2)J}~gᜧY6Ḅᐵᵨᢣ#ᑴ[#ᦋY6ᙠᵬ\]ᳫᙠ\Ḅ_6ᑴ[#ᦋY6()*{[#bcXY6hᜧghᜧP(3)ᳫeᙠngklfgngḄoph⊤IᳫḄh"ᳫᐹᨵḄghᜧᡠ¡¢klmngḄopḄᜧᩭᑨHᳫgḄᜧ.(4)¥UV☢¦§ᐝSQᳫ©ᒴYrsfgPᑮ}~Ḅ.

12ᦑ¬ᫀJ(DᵬஹOPQᳫSᑮUV☢XḄY6PZ[#\Ḅ]Qᳫ^\_6☟@SaP(2)[#bcḄᱥefgY6hᜧiᐹᨵḄghᜧP(3)klmngḄopḄᜧP(4)ᒴYrs®ஹ⚪ூu᪆௃¥¯ᵯ⊤L2Ḅᵯᑣ°±¯ᵯ⊤L²ὶP´µJᵯ¶⁚¸ᵯ2¹%ᡂᓽᵯJ3V,ᡠ©ᵯ⊤“3”¼s½LiḄ¾b¿᝞{21ஹ(1)(2)AÁLiஹL2ḄᵯÂᑖÃ0.3Aஹ0.2Aூu᪆௃ᵫᵯDÅᱥ⌕ᑮ§ᓽK¿¼ᱥ᝞a:

13ᵯÂ⊤Ai#¸DᵯÂᵯÂ⊤Az#AÁLḄᵯÂᙠÇᔠÉᐵÊ᝞ËᵯÂ⊤AiḄIᦪJ0.5A,ᵯÂ⊤A?ḄIᦪJ0.3A,ᑣAÁLiḄᵯÂJᵯÂ⊤A2ḄÌᦪJ0.3AL2ḄᵯÂc͸DᵯÂLᵯÂÎÏ3=0.5A-0.3A=0.2A.ÐÑ:Ò⚪ὃÔ᪷'ᵯD¿¼ᱥÖ²ὶᵯDᵯÂ12,ØÐᑖÙÚᵯDḄ¿¼᧕┯ÐÝᶍᵯÂ⊤Ḅ/ß¼s½¿¼ᵯDX⌕ÖᵯDḄᐗá§஺âஹãä⚪22ஹ(1)1.68xlO6J(2)0.2kg(3)25%ூ᪆௃u¬{(1)UḄ[#J{ᵫ"="(mU=஻è=lxl03kg/m3xO.OO5m3=5éUᔾᦈḄì#{஺ᔾ=஺U”U(Lfo)=4.2xlîJ/(jtgJC)x5Rgx(100࠷-20࠷)=1.68xl()6j,(2)ᵫ⚪ï஺ᔾ=஺*20%=1.68x1063ñ!|஺=8.4x106..♦஺=ô᜜ᓽ{8.4xl06J=/nx4.2xl07J/*g,u({஻=0.2Ag(3)ᦋÊ◤⌕Ḅᜩᯠø(0.2Ag-0.04Ag)ìJ{2%="'q=(0.2Ag-0.04Ag)x4.2xl07j/Ag=6.72xl()6/,ᙠùøᮤḄìᦔ᳛J{t஻=^W%=1.68x1஺x/M%=25%¬:(1)U◤⌕ᔾᦈ1.68x1061Ḅì#Pফ஺6.72xlO6J▭ÿὑḄ᯼0.2ᓟ(3)ᙠᮤḄᦔ᳛25%.(1)ᵫḄ⍝Ḅஹ!"ஹ#$%&$ᑭᵨ஺*=cm஻ᜧ)◤⌕ᔾᦈḄ.(2)ᵫ45ὑ᯼Ḅ20%6ᐰ89Ḅ:4ᔾᦈḄ;᯼6ᐰ89Ḅ<ᑭᵨ஺ᡂ="@A▭5ὑḄ᯼.(3)9ᦋDE5ὑ᯼Ḅᑭᵨ஺ᡂ="@᯼6ᐰ89Ḅ<ᑭᵨᦔ᳛ᙠᮤḄᦔ᳛.23ஹ0.5A8Qூ᪆௃ᵫ⚪G;HᵯJKὶMNḄᵯO

14PKὶᵯQNᔜᜐḄᵯOT:ᡠVᵯQNḄWᵯJUU6VR=I7=7=C