2022-2023学年安徽省芜湖市八年级下册期末物理模拟试题（含解析）

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2022-2023
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௃(1)ᓱᱏEabcdᔜᢞ=ghṹEghṹᵫjkblmnᓱᱏopqEgᔣrsNᔣḄttḄᜧujhṹḄkhṹḄᦪwxytHxᜧᡠbz᦮hṹgᦪᦋtḄᜧ஺(2)[3]ᓱᱏ=gᓱᱏEaḄtHᙠ=ᩩG2ᓱᱏH,⊝Mqᙠ=G2ḄEg,⊝஺(3)[4]ḄjḄᐸ⌕IUᙠḄᩈᙽ☢Ḅ᥅nᜧḄ¡U8Ḅ¢ᱏ£¤ᢞᙠ¥¦q᥅nḄ¡ᦑBCD┯«A®஺ᦑ⌱Ao22.,⊝1ὡ4=´µ(ᡈMxM7=¸x¸7)ூ
௃(1)[1]ᩨᩚ,⊝¹᝱Iᢣᩨᩚ☟½¹᝱ᡈᒴ¿M¹᝱Sᩨᩚᜐj☟½¹᝱86ᩨᩚᜐj,⊝¹᝱஺(2)[2]ÁÂÃÄÅᵫ/ÇÈᑮ8ÇÈÊᯠ1ᩨᩚᙠᩭḄÇÈ,⊝9M7ᜧ¸ஹ¸7᪷)ᩨᩚ,⊝ᩩ/MᓽÂÃÄÅTᦪ஺(3)[3]᪷)ᩨᩚ,⊝ᩩ/2Nx5cm=Bx1Ocm&b2=1N஺[4]ᑖ᪆ᦪ)MM7ḄÖ×ØIuj¸¸7ḄÖ×ᡠQᩨᩚḄ,⊝ᩩ/Iᱏ4=´&(ᡈMxM7=¸x¸7)஺VᫀX8⚓ᐳ11⚓

1623.k0.54x10,ூ%&௃(1)[1]ᵫSBÚᙽḄkG=2.0N஺(2)[2]ᵫSCÛÚᙽÜÝᙠ!9ᑮÄÅḄtÞ=L5N,ᱥàᑮḄáFâG-Þ=2.0N-l.5N=0.5N(3)[3]ᵫSCDÛÚᙽÜÝᙠ!ḄÄÅḄTᦪrᵫãkäÛᡠárᑣáÜÝḄæᐵ஺(4)[4]᪷)èéêëᳮÛÚᙽḄà×0.5N________"=/!==5x10—30gl.OxlO3kg/m3x1ON/kgÚᙽḄîwG2.0Nm=—=0.2kgg10N/kgÚᙽḄï஺ᔛ=ñᜓ=41஺Ḅó24.(1)120Nô(2)0.3m/sô(3)250Nூ%&௃&U(1)ᵫSÛõökᱥḄlm÷ᦪᱏ3,ᡠlaḄtøF=|(G+GM)ùMcdḄkøG#3úG=3x200N480N=120N(2)ᱥàûMḄ¿øh2mü.v=—==0.lm/st20sýᵫaûMḄ¿øv/=wv=3x0.1m/s=0.3m/s.(3)þkᱥÿ
150N,⌕ᱥᒴᓣᵨᙠᵫḄᫀ9⚓ᐳ11⚓

17F'=g(G'+G")=$(480N+150N+120N)=250N,(1)"-./120N$(2)ᵫḄ0"1/0-3m/s$(3)7ᱥ8
150N,⌕ᱥᒴᓣᵨᙠᵫḄ:;/250N஺25.(1)0.4N$(2)0.8x103kg/m3$(3)0.1NூAB௃পEFG=4.010Hᑣ/J/ᜩ%1.Ox103kg/m3x10N/kgx4x10-5m30.4N(2)ᵫNᱥᙽPQᙠR☢ᑣᱥᙽḄG=%0.4NᑣTU஻WX=0.04kgg10N/kgᱥᙽḄY1p=—=—°"4Zஹ=0.8x103kg/m3(3)ᱥᙽា]^ᐰ`aᙠRbcdcᩈᙽfᑮḄQh$ijNᓃJl.OxlO^kg/m'xiON/kgxSxlO^m30.5NᵫᱥᙽḄfq⊝sFF'=G+FnᡠXu
ḄvF=F\ஹ0.5H0.4N0.1N,(1)ᱥᙽfᑮḄQᜧy/0.4N$(2)ᱥᙽḄY1/0.8xl(Pkg/m3,(3)WḄᜧy/0.1N஺ᫀ10⚓ᐳ11⚓

1826.|"60km/h4x105Paூ
௃(1)[1]ᵯ"bḄ᪛ḄᦋdX/᯿ᱥ,Ḅ᪛|"Ḅ஺(2)[2]EFḄs-6kmᵨc6Z=6min=—h=O.lh60ᑣqᙳ1s6kmnv=—=----=60km/htO.lh(3)[3].ᵯ"Rqᙢ☢ḄvF=G=1.2xlO5N.ᵯ"Rqᙢ☢Ḅv¡F1.2X105NP2=4xlO5Pa~~s~0.3mᫀ11⚓ᐳ11⚓