求一道初二的物理难题.要涉及到滑轮、浮力、机械效率,如果可以加上压强.要有难度的!急要!只用初二的知识!

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 18:42:15
x[Yo#ɑ+e,jyj-a0flm,zְL⡃,uHݷZ$Ւ(|h3/bH3B*+3222/"Sz_:sk"U7Wk&s79Y[HUekweMŦ<ʍId^Y鷎^$2ˢT4 ('#=Fӏya =+}1?TVv %sc|Y;6Xh.-S{Pzٮjec,~I]חE*g]T~%2uW[T5HB5M64gg ͉uܻWB%~$ZIXs+[Lc2"NVQc:W+q\.!ѦD{c2Rt]u1',7i #@AN!f0c5wŭiab-mזd`5j0 sn/ӄ>EqmҞB"`"l~Fm;4cٔ],VCtC'_y@Z~^owo{Br;,K]dU ='.;vj Zdn&9j^oCӋ@rO59yVnkhu2v#W"ˊVˈD,)XȞxܮH"KER5P7R U"iMSC?! b[av7p-P<ӼّUS #=2e0aoroU6kfUj"P>';Nt.;}ͷ([: ']ƮK~xoJ"=wgbgVrCל5|T ;=|{˞֢OmeZ h %Hݓ:Q 3-*eljKfYg7 {73cg8ά{پ*vK1[:ϜҁH6D rV&eknt?8Ep&IL10z *+,qg+QJ@?4Ǭ79ft J΀!""N`]$_f́44Mtt,h[*-<; X]#+ yuewk"C$vP6E7 Gd𓗙SaAT1X((hbsʆsuOp^Kxq lo*~ WDoFީi . =‘g`VeROoeŽG^$#2DX5^.Ey{De$/Hj]`|if, (!vZ)B:iqMؽUlȟP?G7<!Z(،*?PV݂j":';E:U0= B-qi5{9`9TaHDY=޾0_RAzYɕR#yx0@֢doi޳Z5>$Tm3G*L ,^q d.Ƚ6TՔv&v.E1E Q췫vy@Vvwd>v^fCl|CZMnn3ia݀ ^Wyj]Sшy8BOUă#r3 Ftmܰp- yr$AGx"mh`'m+کmǎ9qto,cjoRC)wABt=C6Ը>f3).A~cK,0uV\lfC s5]a?!I7Ub`da*DSMPT4. 9YD%NI9 $BH ?UN-H1=} \UAˎ0(̫F˒TY=[;UTt O0 %'Du(WT}<~'UL .A 0umw1"L|jJCJ1@vIN rY6ʩ,^99 |d^lw0zİ\%`])#, 3A5k"/l*VU!!\_ ! :iWloe}uZ[Msȣy$S AM"P/:b9 AecbÅ{fZGb-s"~?oY 1!J5՜Ȧ+uT{M?T(4"5Y] cj7 `u}c(_n kasxM7WWi՞ SS 0^OS/} P9R&Dn&sbc"<ͭZ)R_n>UMֻwꦖ'ўþިDX#-_P'ӢUAtz[NHc*GEzۅ`Dx-0e㘀]q89O} aPwA~Rkg%ޮ9 7cR•?k1 4p>=遈.W`ɚK bZQ.%3sM#*ODZ^51ry{?Y6g- }^d1iPui'sN.L{(`?"چ;5(sqr BBXL!`|+f ɺ%/b&T]%sqgwK`?I~.[1:)0d8:@XL䝃ßPUBuP*p$D͙]iu"N')5OeGez M\|F}k].Y4LOY7x2@?M/IfLp VTh!/}_Be8Y{r$C ;eCZr b*45@B"<:UEOMۉ4!{19/U%n$_M)x=TPG<,41V ܻWTJ gAu{J=SJTBHD~X 򄊔@#O^gOT;4{޴qT*-7.2hz|L,97ERdg#TJT vtX[?>3r .x]GJtGUfE%7&(ISW6?P7ØInP:W%(ߤ4))$¼0BU{!0}GT6UFƒFIآo|:GB!u4 o*$/W1\|A"?h6#a4> 0nn-|(p(u=sy45<yΰĽSG>A]Ex=&-P<ɡ&߭S3Cb OkkL_&Roitz΄%4z %ː+d\cws12Zbt芪]ɦIh@oCѫ&wh A/;UCsOB[2w8 9EpɔdB-n*(xڅk \*qwj.WEgi9fUL o-E`@ FP@ EpDh6Ѧ |n53DJg]=C4^)qj`ʠԧAp4~ wpK;WK^@LWd<6ƕ>c9[R׀ e*%@%n  N5.A2@"vp?JS@l>4:7w)]2]\)my(^t,tiq>%<gsZso <DNq3@Ⱦ\25r#f'Q%©z4H8j"]`¼P[Br{<TD$H@X`1J'~1c|BnJaBRŰmrXݣ U7K,t.5^FLSҚ YRnVi{pnxbsk n%FcH?WUG%zp0BUҡO@:TDf؇U:̊_MqW1ҧg_bǹ=FxnhUY9gtT:nekq8pCO)Q ӅQ()q:q4lhEc\+`cl)g!ؼ,&݄S(ב xƣ$)q=ecTɊIF~B .cLr* ktc,#;jQyRS Mh\K v󪑑^ς^Mb? D|ꏹ`stlKNIn7{F%o/iH +RAǓ 3Ňv-Gfr^SQ܃*E1z_5vstM<ꖱ"j\oW޽aߓ[bƞ*8I2Ş 棯S3N9膗xB{ 2}|`H$14#~krH*(p1 vepLF"DG괆"2} Dۧ{ 4W4D?u0 bsnN\-[r:a}2La9||Q%J;gwٝ~޹Le;V&huMUU>nă.)BLS{UgOATm=ͷ(InQŚo8@`ףLɩ+#cĿx7IPel(2H\R%Æcu1g"jf۽]y*zl095Ttrt Tܟow0;tr-݂Nݴ((]P>Mtz &a^][ ¹7g?:xYcX'3;C9ׄ5xQ׳ k,sŀ͏eXC%#ϭ#O_@⯦Amʈ7?vSJM@*E=u mdB