2021-2022学年云南省昆明市西山区八年级（下）期末物理试卷（附答案详解）

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2021-2022
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1925.ூ?ᫀ௃²B(1)þ8ÿ☟ᙢ☢ḄF=G=mg=7.2x103kgxTON/kg=7.2x104W,☟ᙢ☢Ḅp=f==6x105Pa(2)ᙠ☢ᒴᡠḄ/=0.04G=0.04x7.2x104N=2880/V,ᜐ"⊝$᝱&ᡠḄᱫ()*=f=2880N,ᢥ,-ᙠ☢ᒴᱫ(ᡠ./W=F᳛s=2880/Vx100x1000m=2.88x1087(3)ᢥ,-ᙠ☢ᒴ100A7„ᡠ◤Ḅ1t==23=Ih.=3600s,ᙠ☢ᒴḄ/᳛P=5=67=8X1஺49஺t3600s:5(1)☟ᙢ☢Ḅ<6x105Pa(2)ᢥ,-ᙠ☢ᒴ100☢?ᱫ(ᡠ./<2.88X10>(3)ᙠ☢ᒴḄ/᳛<8x104IVoூ@᪆௃(1)᪷DF=G=mgEF☟ᙢ☢Ḅ&᪷Dp=GEF☟ᙢ☢Ḅ(2)᪷D/=0.04GEFᙠ☢ᒴᡠḄ&ᜐ"⊝$᝱&᪷D)ᱫ=/=EFᡠḄᱫ(&᪷DW=FHEFᢥ,-ᙠ☢ᒴ100kmᱫ(ᡠ./(3)᪷Dt=EFᢥ,-ᙠ☢ᒴ100kmᡠ◤Ḅ1r,᪷DP=?EFᙠ☢ᒴḄ/᳛஺I⚪ὃL/ஹ/᳛ஹḄ-N&Oᔠឋ&RS〉U஺26.ூ:ᫀ௃@5(1)ᵫYZ[&n=2,\-᥅^_`a&bF=(G+Gc),ᑣcgha:Gc=j)kG=2x500N-700/V=300N(2)ᱥmᓣḄS5%=¥=,=7nA`opᵫqrcḄS5v—2Vᱥ=2x0.2m/s=0.4m/s,`opᵫqb)Ḅ/᳛P=Fv=SOONx0.4m/s=200VK(3)sghtḄuvᦔ᳛5x20⚓&ᐳ22⚓

20^0=gxl00%=^xl00%=^xl00%=^xl00%=70%r?=xl0%(4){|}~Ḅᨬᜧb"{|Ḅa&Fᨬᜧ=6@=600/V,\-᥅^_`a&bFᜧ=(G⊤ᜧ+Gc)&ᓣᱥmḄᨬᜧa5Gᨬᜧ=nFᨬᜧ-GA=2X600/V-300/V=900N஺::(1)cghḄa<300M(2)`opᵫqbFḄ/᳛<200W(3)sghtḄuvᦔ᳛<70%(4)s{|ᑭᵨsghtᒴᓣᱥmḄᨬᜧa<900Mூ@᪆௃(1)ᵫYZ[&n=2,\-᥅^_`a&bF=(G+Gc)&Dcgha(2)ᑭᵨSᱥmᓣḄS&`opᵫqrcḄS"ᱥmᓣSḄ2&ᑭᵨP=?==Fo`opᵫbFḄ/᳛(3)ghtḄuvᦔ᳛)=,==ᩩ(4){|}~Ḅᨬᜧb"{|Ḅa&\-᥅^_`a&BCFᨬᜧ=D(Gᨬᜧ+GE),DᓣᱥmḄᨬᜧa஺I⚪ὃLᵨghtcghaஹ/ஹ/᳛_uvᦔ᳛Ḅ-N&ᑭᵨ\-`a_᥅^F=5(G+Gc)ᐵ஺27.ூ:ᫀ௃@5(1)ᵫYZ[&-ḄᨬᜧᦪFᨬᜧ=18NᱥᙽᐭU&ᑣᱥᙽaG=F⊤ᜧ=18NᵫG=mgZ[&ᱥᙽḄ¢£m=&¤஽=1.8kgDg10N/kgu(2)ᱥᙽ¦U-ḄᦪF=10NᱥᙽᑮḄ¨?¨=G-F=18/V-ION=8N(3)ᵫF¨=PFgv4GH,ᱥᙽ¦ᙠU᣸ªḄm«஺/=£=.®…g=8xIO-&/ᵫ"ᱥm¦ᙠU&ᱥmḄm«U=°=8X10-437nᱥᙽḄ±Sp=£=²6%=2.25x103kg/m3:(4)ᱥm¦´µᐭ¶·Ḅ¸S¹ᓄ£<4h=?=I»5{=0.08m¼ᘤ¾¿ᑮḄḄ¹ᓄ£

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