机械能试题

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òóôîïk,£îïᙠõóôPQ#ᨬᜧḄîឋ«V÷ᩈᙽ?ø3m/sîïḄîឋ«V஺XᫀZ50J32J26.ᓅ!"#$%&'()*ᨴὃᙠk"☢ᑁᨵCûüḄýᙊÿ4⍝ᐸ0.4m,⍝Ḅᨬᙢ☢h=0.8m<1—■z?/=0.1kgḄ#$ᙽ&⍝Ḅᨬᵫ☟)*+ᑮ-ᨬ./01Ḅ23456⍝7ᙢ⍝ᨬḄ235᮱0.8m஺:;<=>?10m/s2,BCD1E#$ᙽ56⍝.Ḅ4ᜧ#GD2E#$ᙽHIᑮ⍝ᨬ.J⍝ḄK=ᜧ#GD3E#$ᙽᙠ⍝NHIḄOPQRS᥅U=ᡠWḄX஺YᫀC(l)2m/s(2)2N(3)0.2J27.abḕᑭefQ2010ghNijklmᨴὃpm=2kg#ᳫᵨspL=2mḄuvwxᙠᜩz{NḄ஺᝞}ᡠ~#ᳫ}~☟)*+}~vᔣᜳ0=60°,ᵫvḄ=ᨵ▲#ᳫ᤮ᑮᨬ.vា஺ᨬᙢ☢h=1.25m஺D:;<=>?,g=10m/s2ED1EB#ᳫHIᑮᨬḄ4஺D2EBvḄᨬᜧ=p¡D3EB#ᳫ¢☟)*+ᑮḼᙢOPQḄ23¤஺¥᪆CD1EᵫI1ᳮᡈ©ª«ឤ1¥®v=2"஻/s……D4ᑖED2E᪷µ¶·kf1ᨬᔠ=¹ºᔣ»=®F=2mg=40N……D4ᑖED3E᪷µ3½HI¾Xo=vt=2Â/sX0.5S=Gl……D3ᑖEX=x஺+Lsin0=y/Sm+m...(1ᑖ)

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☢@¿zYEk>?2mḄ☟KBᳫBâã5ääåWAᳫæ~ᑣåWBᳫḄzYRBA.OB.EJ2C_2E/3D,Ekk4.çèḕéᵪÖ2010¸$᥎ìὃ¼>?mḄBᳫDoí☢$ᜐᵫ☟K~ní☢oᙢ$-6,᝞îᡠðT@í☢Æὃ☢ñòBᳫnᙢ`ḄØÅYó᦮=_õÖBᳫØÅYḄöᓄᑖø(D)A.mgh,ÙrB.mgh,ÚFmg(H+h)C.-mgh,ÚÒmg
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48zts
02.44.26.37.89.010.011.012.0ᔜÚ:m/s
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DᵨNḄ⁚FOP.ᙠRᔠ-ᐰUV⌕XḄYZ[\G]N^ᜓ`abḄcᵨᱥefgᑴijklmnoNpqG].ᎷsNt72km/hḄ{|ᒴ{UV~pqᦋஹ^NᑮḄ&ᑖ?2000Nf1950N.OPoN᳛G]@]'sNḄᱫ&ᜧ?Nᡠ&ᜧ?/,N{|?vNᒴ{ᡠtজ%2ᑖḄ᳛P=Fvঝ%2ᑖ72ᵫজঝ¡AP=%/-/v=%2000-1950x——W=lxlO3W%2ᑖx23.620.«¬ḕ®«¯;᪥2010°±²³´µ4¶ὶὃᙠ᝞ᡠ¸Ḅ¹bº
ᐝ¼Ḅ½¼¾Ḅ¿ÀÁ⊤☢ÄÅḄÆ☢ǽᙠᙢ☢³Æ☢ḄÉÊ?9=30஺஺ᵨ4᪷̽¼¾ḄÍÎ/ÏᵬஹѺᱥÒÓᵬᱥÒaᙠÆ☢³Ô/ÕÖÆ☢3UÓÑᱥÒ×ᙠ"Øo×ÕÙÚÔÛÜÝÚOᔣa=60஺஺à~áaᵬஹѺᱥÒÑᱥÒâᙠÝÚ3☢ᑁäåÑᱥÒæᨬ±èfᨬéè~ᵬᱥÒᙠÆ☢³ᙳាìí¼஺îïÑᱥÒḄðk?m=lkg,òóô&i{|g=10m/s2஺X'ᵬᱥÒḄðköÆ☢÷ᵬᱥÒḄᨬᜧ☟᥅ú&஺'sᵬᱥÒḄðk?M,ᡠḄᨬᜧ☟᥅ú&?f,ᑣåÑᱥÒᑮᨬ±è~Îý³Ḅþ&ᨬs?T1,ᱥ='ngCOSa...............ᵬᱥាᨵMgsin°=/+.............Mgsin0=f+mgcosaᱥᑮᨬ#$%&'(Ḅ*+ᨬᜧ%-T2

500g/(l-cosa)=>mv2ᱥᵫ23ᳮ2.....................v2T-mg=m—25ᵫ67893:I.....................ᵬᱥា(ᑣᨵMgsin0+f=T..................2.Mgsin0+f=mg(3-2cosa).=஻?(3-cose-(kg)DE2sme.....................3_f=—mg(1-cosa)=7.5(N)21.Fᓅḕ⊝JKL2010NOP(LQ8RSTẆὃW᝞Yᡠ[\☢^_-45°,b\☢(cA$ᜐᵫ☟ghijklm-mḄ*ឋpᳫᙠB$ᜐt\☢uv,uvwxyᜧpzcᔣz-J|}~jᙠC$S\☢uv஺AB$ḄOy-h,+0xy-g,ὃ⇋+஺1pᳫᙠAB~K+Ḅ|ᙳ᳛P2pᳫᑮC$xyḄᜧp஺E1pᳫ~Kᵫᑮ\☢B$Ḅxy-v,2g஻=/Ev=12ghᡠpᳫᙠAB+Ḅ|ᙳ᳛p=mgv=*Lng2pᳫbBᑮC|%BᑮCḄ-3¡cᔣBCsin0=-gt2J|cᔣBCcosO=vtEf=2y)2h/gᡠC$Ḅxy-v=yjv2+g2t2=c22.£¤ḕ¥¦PK2010NOP8jSᨴὃᙠ¡|☢ᑁ©ªxoy¡_ᙶ᪗¯”⊤[¡ᔣ(cᔣ.᝞Yᡠ[.²|☢ᑁ³ᙠ´xµ¶ᔣḄ·¸¹ᜧḄᒴ»ᵯ½.j¾ᵯpᳫb

51ᙶ᪗¿$஺´஺ycᔣ4JḄÁ2¡ᔣ(Â.Ã+ÄᑮÅḄᨬOÆÇ᝞YKM$ᡠ[.পpᳫᙠM$Ḅ2EkM.(2)%pᳫÌÍÂ$ᙠÎjJ|☢ḄÆÇ-N$pᳫᑮÅN$Ḅ2£.kNE᪆(1)b0$(ᓣᑮM$¡cᔣ(:12y=2gr-tngy=0-Ek0J|cᔣ(12x=—at~2F=ma233x%=Fx=%7=4=2.25J(2)pᳫᵫ0ᑮNḄf'=2fX0N-^at'2=4xᑮN$+Ø2zᓄ-Úᵯ½+ÛÜÝÞ2Ḅzᓄ&0N=£ÝXEkN=FXON+Ek஺-E---4x+E-13Jk0k0y23.à©ḕáâ9K2010NOP᥎äὃW•lmm=2.0kgḄpᱥᙽ•3ḄÁxyç(j^_-37஺¹èḄ\☢éÎLᑭᵨìíᘤïÂðpᱥᙽç(\☢~KñkòḄóxyôᵨÃõÝÂðpᱥᙽ(~Ḅ

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