2021-2022学年北京西城中考物理五模试卷含解析及点睛

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2021-2022
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W=Fs=250Nx4m=1000J
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14U'3Vãäåæç<*gᘤtᐭᨬ_ᵯrᵯᨬᜧᦑᵯrḄᨬᜧᵯ]í/'=—=-=0.3A,ᦑᵯ⊤⌱ᵨR10QÅõᑣᐸ=Ḅ┯yᡈ)¥¦ᜐ,íᵯ⊤ஹᵯ⊤ḄÅõ⌱öᜧ.22ஹ40761.15.±²᎔ᐭùú=N%ᨵûᑖ±²ýᶇᙠÅÿ
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RSṹUᑮ᪗XYḄZ[;ᜐ]^ᑣ_`YabcRdeᔣ⁚;(4)ᵫ#ᵬ%&'()Ḅ*+V=40cm3,ᵫ#,%&'-./Ḅ0m2=76g,ᑣḄ-76g-30g=46g,ᵫ᜛=%tḄ:;:m_46g=1.15g/cm3V-40cm3(5)wxy)ᐜḄ*+@R᎔ᐭ-.)z{ᐰ}᎔ᐭ-.)~ᨵ}ᑖᶇᙠ(
Ḅ᪷2:;0=%mVzᑣ:;.ூ௃⚪ὃᜩḄ⁚ஹ:;Ḅᵨᡃ:;Ḅ.Ḅᔠᳮ¡᣸,R£¤ᑮ¥JḄᜧ§wᡃbcᱯ©ª«.¬ஹ89⚪(ᜧ⚪ᒹ®2⚪ᐳ22ᑖ.°bᑏ'⌕Ḅᦻ´_`ஹ/a⌕Ḅµ9¶·¸ᑏ'ᨬ]°ᫀḄz{tᑖ)23ஹ(1)2xlO4W(2)0.16kg(1)0.2ூ᪆௃(1)ᱫÁÂᡠÃḄÄW=Åᱫs=1.0xl0iNxl.2xl04m=1.2xl07jᱫÁÂÃÄḄÄ᳛P=—=L2x1°7J=2X104Wt10x60sWw12X107J,(2)ᵫ7=/—%tÐÑÒᐰÓ-O'ḄÔQ=—==2.4X107J,2O750%

15ὑḄ}m="=4=0.16kg
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(2)N#aὑ30.16kgḄ(1)ὑḄQ\20.2ml24ஹ(1)L26X107J
(2)0.42kg.ூ᪆௃(1)BḄ}V=50L=50dm3=0.05m3,ᵫp=m/V¢'BḄ£`}m=pV=1.0x103kg/m3x0.05m3=50kg,ᙠ$᪗¥ᜧ\'BḄ¦§t=100࠷,ᑣB◤⌕ᔾᦈḄ«`}Q«=cm(t-to)=4.2x1¬J/(kgC)x50kgx(100-40)࠷=1.26xlO7J
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