2021-2022学年广东省潮州市湘桥区八年级（下）期末物理试卷（附答案详解）

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2021-2022
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9s(ÐᒴÒÓNtᵫ*-tZ[0¼ᙠÏ8s
9sͺÎḄtF=30N,᪷Ô⊝ᩩÇ0¼ÍºÎᡠḄ᥅~Õf=F=30/V.ফᵫZ¼7
12sͺÎᒴÒu=6m/s,ᦑ7
12sº×ḄØis=vt=6m/sx5s=30m,bᙠt=7s(qᑮÙÀÚØiḄ'Ûᡠ0
7sÜhḄØis'=s=30m,ͺÎᙠ஺
7sᑁḄᙳÒ61/=£=?ᑶß4.3/n/s.(3)ᵫp=51bàͺÎᙠᙢ☢º×(.eᙢ☢ḄF=pS=3.3x105Pax20x10-4m2=660/V,ͺÎᙠᙢ☢º×(eᙢ☢ḄbyͺÎḄâMᡠͺÎḄG^=F-G>?=660N-450N=210/V.l(1)ͺÎᙠÏ8s-9s(ᑮḄ᥅~Õ30M(2)ͺÎᙠ0-7sᑁḄᙳÒ64.3m/s.Ï20⚓ᐳ23⚓

20(3)bàͺÎᙠᙢ☢º×(eᙢ☢Ḅ3.3x105pa,ͺÎḄ210Mூ᪆௃(1)ͺÎᙠÏ8s
9s(ᙠᙢ☢åÐᒴÒNtᵫ*-tZ[0¼(Ḅt᪷Ô⊝ᩩÇÂͺÎᑮḄÕ(2)᪷⚪çÂ0
7sÜhḄØiᑭᵨ஺=ᙳÒ6(3)ᑭᵨp=!ÂͺÎeᙢ☢ḄbàͺÎᙠᙢ☢º×(eᙢ☢ḄbyͺÎḄâMÂͺÎḄ஺:⚪ὃFḄᜧஹÔ⊝ᩩÇḄfᵨஹÒ678éᐸfᵨஹᐵëìZ[íXYZ['\1îᐵ`aï஺24.ூlᫀ௃(1)ð²☟òᙠó⍝åeó⍝Ḅ:F=G=mg=50x103kgiON/kg=5x105/V.xᑣð²eó⍝ḄF5xlOs/VV=-=1.25x106Pa.ySO.4m2(2)ð²ḄᨬᜧðºÒ6600km//i,ᵫu1ð²ᡠ◤Ḅᨬ÷(|s1200kmr..t@ᨵBC.(3)ᵫGHIJKᳮ01ð²ᑮḄF=G᣸=m᣸g=48x1஺3kgxION/kg=4.8x105N.e‧ùḄp=pgh=1.0x103kg/m3xION/kgx2m=2x104Paol(1)ð²☟òᙠó⍝å(eó⍝Ḅ1.25x106Pa.(2)úðûð²ᙠ¦'Óðº\200km,ᡠ◤⌕Ḅᨬ÷(|2.4ü(3)ð²ᑮÙWḄᙢýþûÿᙠ☢᣸Ḅ48r,ᑮḄ4.8X10S/V.‧Ḅ2X104paூ᪆௃(1)ᙠᙢ☢ᙢ☢Ḅ!=G=mg,ᯠ#᪷%p=(()*⍝Ḅ,(2)-./Ḅᨬᜧ23᪷%2345Ḅ675t=,89ᡠ◤Ḅᨬ<=,(3)᪷%F=G>89ᑮḄ,᪷%p=pg/i89‧Ḅ?⚪A⌕ὃDEஹ23ḄGᵨ()ᐵJ⌕KLMᐵḄ()45NOᵨᑮEPQRḄᱯT஺25.ூWᫀ௃☢YZ[\]1.52000R

21ூ᪆௃_(1)᪷%p=(`ᙠa.bcdefᜧE☢YghZ[EdᙢḄ,(2)cdὅgdᚁckᐸᡠRmᔣ\]ᔣkḄ஺(3)ocdὅᙠdᙢpᶇrsatuvwkxᡠycdὅz{ᙠ1tᑁ}~s1.5TH,ᡠycdὅḄ23ᨬ[_u=,==1.5m/s,cdeḄ☢Y_S=1.5mx0.12mx2=0.36m2,cdedᙢḄ_!=G=720N,cdedᙢḄ_p=^=-^=2000Pa;(4)ὃ⇋ᕒRᵨ஺ᦑWᫀ_(1)☢Y,Z[,(2)\],(3)1.5,2000,(4)R஺(1)Ḅo☢Ya.☢Y[ᜧ,(2)RḄmᔣ\]ᔣkḄ,(3)cdὅᙠdᙢpᶇrsatuvwkxcdeḄ1.5m,᪷%823,cdedᙢḄcdὅQcdeR720MᵫcdeḄ1.5mஹ0.12m,8cdeḄ☢Y᪷%p=5,(4)ὃ⇋ᕒRᵨ஺?⚪A⌕ὃDEZ[ḄmஹRḄmᔣஹ23Ḅ()ᙠ()⌕¡☢YcdeḄ☢Y⌕)ᡂaḄ£a᧕┯T஺26.ூWᫀ௃¦Z[40ூ᪆௃_(1)§¨ᵨ©ᩚᙠ«ᵨ¬[¬ᡠy®¦ᩨᩚ£°ᩨᩚḄ±ᜐḕ´µ,(2)¶〈§¨¸¹⌕ᙠ¨º»¼Ḅ½ᙠ¾¿Ḅ½kÀÁᩈefᜧEᙢ☢ḄÃÄ☢YZ[ᙢ☢ḄÅƧ¨ḄÇ.ឋ,(3)¶〈§ᨬᜧ0.8Ma=0.8x106Pa,᪷%p=p*^hDE,0.8xl06PaÉÊȨ̈ḄᨬᜧÆ3_Í=2PF2.0xl03kg/m3xlQN/kg-'⌕ÎÏÉÊ˧ÆÐᵫÑm8`ᙠa.GZ஻ஹÉÊËḄÓ3ᓽᙠÉÊËÕᐭ〉Ḅ஺ᦑWᫀ_(1)¦,(2)Z[,(3)40,஺(1)᪷%¬Q¬Ḅᜧ[ᐵØᑨÚᩨᩚḄÛÜ,(2)ݼᩩ¾¿»ßᔠᳮâ.ᙠᙢ☢fE¬Z[EᵨᑭᵨEᩨᩚäᳮ,ᙠ¾¿Ḅ½kÀÁᩈefᜧEᙢ☢ḄÃÄ☢YZ[ᙢ☢Ḅ,(3)᪷%å=஺஺/1ᑨÚÉÊËḄ§Æ⌕ÎÏÉÊ˧ÆÐçᐭÓ3[Ḅᱥ஺?⚪ὃDEéᩨᩚäᳮஹZ[Ḅmஹ45ḄᳮKLêᔠឋë஺ì22⚓ᐳ23⚓

2227.ூWᫀ௃ḕï¦ḕ:ñᩭóᜮூ᪆௃_(1)õöᩭ÷ᐸøa67Ḅᩨᩚ¾Tᙠöùᜐᵨᙠúᵨᙠöᡠyᐸ¬ûᜧ¬ᦑõᱥḕᩨᩚ஺(2)üýþÿ
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