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        1. Ӣҽ̾W(wng) > > }ĿԔ

          }Ŀ؊W\(yn)(hu)gһNh(hun)τ(dng)܇(ch)ڸ(chng)^֮gτ(dng)܇(ch)(dng)r(sh)(ni)ȼC(j)늳ͨ^(gu)ijNʽ܇(ch)݆ݔ(dng)Ҫ늳؃(ch)^(gu)͕r(sh)(ni)ȼC(j)(dng)ȿ܇(ch)݆ݔҲͬr(sh)o늳س(dng)܇(ch)vҪȫٕr(sh)(ni)ȼC(j)늳߀ͬr(sh)܇(ch)݆ݔһy(c)ԇˆT{ԓ܇(ch)ƽֱ·τ0.5h^xP(pn)l(f)F(xin)@Εr(sh)g(ni)܇(ch)(ni)ȼC(j)ȼ 4.475kg܇(ch)ٞ50km/h늳ؽM(ch)ֵ60%ӵ80%늳ؽM(ch)ֵ1.08108J܇(ch)ʹüg(sh)փ(c)y(c)ԇˆTl(f)F(xin)ԓ܇(ch)ʹõȼ͵ğֵ4.0107J/kg܇(ch)r(sh)f܇(ch)vP(gun)ϵDʾ

          1τ(dng)܇(ch)(dng)r(sh)늳 D(zhun)܇(ch) ܣ

          2ԓ܇(ch)ڜy(c)ԇ^(gu)Ѓ(ni)ȼC(j)ĠǶ

          3ԓ܇(ch)ڜy(c)ԇ^(gu)늳ؽM(ch)˶٣

          4ԇӋ(j)ԓ܇(ch)(ni)ȼC(j)ЧʣӋ(j)(ni)ȼC(j)C(j)е(dng)^(gu)еpʧ

          𰸡W(xu) C(j)е 51072.16107 40

          ԇ}1τ(dng)܇(ch)(dng)r(sh)늳ذу(ch)ĻW(xu)D(zhun)܇(ch)C(j)е2ɈD֪(dng)܇(ch)ٶȞ50km/hr(sh)܇(ch)ܵ2000N܇(ch)\(yn)(dng)ƽlã܇(ch)F=f=2000Nv=s/t܇(ch)ͨ^(gu)·̣s=vt=50km/h0.5h=25km=25000mĹW1=Fs=2000N25000m=5107J3D(zhun)ɵܣW2=1.08108J80%-60%=2.16107J4W=W1+W2=5107J+2.16107J=7.16107JȼͷųğQ=mq=4.475kg4.0107J/kg=1.79108JW=Q=1.79108J(ni)ȼC(j)Чʣ=W/W100%=7.16107J/1.79108J100%=40%

          (x)(c)ϵд
          P(gun)(x)}

          Ŀ (li)Դ

          }Ŀ1.6mվڸ1mվƽRǰ2m̎Rе__________mƽR________mƽR0.5mtľx________mһKľRӺ1m̎Dʾ@r(sh)________""RпԼ

          鿴𰸺ͽ>>

          Ŀ (li)Դ

          }Ŀ(sh)(yn)Ҟṩģһ(g)늉һ(g)_(ki)P(gun)ԴֵԼɌ(do)(xin)Ո(qng)ṩɜy(c)ͨ^(gu)СČ(sh)(yn)

          (sh)(yn)Ҟṩģһ(g)늉һ(g)_(ki)P(gun)ԴֵԼɌ(do)(xin)Ո(qng)ṩɜy(c)ͨ^(gu)СČ(sh)(yn)

          Ո(qng)?jin)δɵ·DDףе̎(hu)m(dng)?sh)Ԫ?ho)ʹ·DB ___________

          Ո(qng)î(hu)(xin)挧(do)(xin)DҵČ(sh)DB_______________________

          (sh)(yn)늉ʾ(sh)Dʾ˕r(sh)y(c)õ늉ֵ________\(yn)ÚWķӋ(j)Եõͨ^(gu)________

          鿴𰸺ͽ>>

          Ŀ (li)Դ

          }ĿDʾ·Դ늉ֲ׃R1=5R2=10R3=5]_(ki)P(gun)S늉ʾ(sh)1.5VtԴ늉________ Vͨ^(gu)·________ A늉?y)Q]_(ki)P(gun)Sʾ(sh)________ A

          鿴𰸺ͽ>>

          Ŀ (li)Դ

          }ĿijͬW(xu)̽c늉P(gun)ϵO(sh)Ӌ(j)Dʾ·D

          1Ո(qng)(j)·D(sh)Da(b)____

          2]_(ki)P(gun)ǰD׃ĻƬPҪƵ________ˣAB

          3ͨ^(gu)(sh)(yn)є(sh)(j)ӛڱһУ һ R=15

          U=4V

          ɱһɵã________һr(sh)c늉ȣ

          ɱɵã늉һr(sh)________c________ɷȣԓ(sh)(yn)У􌢶ֵ5Q10ҪCɶ˵늉ֲ׃׃·еֵ(yng)׃________󡱻С

          鿴𰸺ͽ>>

          Ŀ (li)Դ

          }ĿijͬW(xu)һ(do)(xin)@һöFƳһ(g)늴FˆDʾ·оĴ׌늴F^ᘵĔ(sh)Ŀдʩе

          A. ȡ늴FеF

          B. (dng)׃ĻƬһ(dng)

          C. pF@(xin)Ȧє(sh)

          D. 늳صؓ(f)O(du){(dio)

          鿴𰸺ͽ>>

          Ŀ (li)Դ

          }Ŀо늄(dng)C(j)Ĺ^(gu)

          (1)늄(dng)C(j)ĹԭǴň(chng)(du)______׈DУ(xin)Ȧ҃߅abcd෴ԭ______(xin)ȦĈDʾλD(zhun)(dng)______Ⱥ(xin)Ȧǡ_(d)ƽλKͣԓλ

          (2)҈Dеľ(xin)ȦԳm(x)D(zhun)(dng)?yn)b______ԓbھ(xin)Ȧ______(xD(zhun)D(zhun)򡰄D(zhun)^(gu))ƽλÕr(sh)Ԅ(dng)׃(xin)Ȧе

          (3)ٱDʾ늄(dng)C(j)ģ{(dio)Q______Dе̖(ho)ķÿɷ׃늄(dng)C(j)D(zhun)(dng)

          ͨ늺늄(dng)C(j)ģͲD(zhun)(dng)ǽ|԰~Ƭ(ˢ)?gu)һ?/span>______|(zh)ԣ

          鿴𰸺ͽ>>

          Ŀ (li)Դ

          }ĿD(a)ʾֱ(xin)ABǹ⻬ľc޲ķֽ羀(xin)(ľc޲̎ͬһˮƽ)Ȼʹһ(g)С(xin)S(pxC(j)ϵľ(xin)S)cֱ(xin)ABһǶȵķPOٝL(dng)Կ(xin)S޲ϝL(dng)ķl(f)˸׃D(b)ʾһĿ՚б벣Еr(sh)Ҳl(f)˸׃

          (1) ɈD(a)֪(dng)(xin)Sļ݆|޲r(sh)ٶȵĴС______ (x׃С׃׃)˕r(sh)݆ٶȵĴС_____(x׃С׃׃)

          (2) ĈD(a)(b)ɷN(li)ƬF(xin)֪ɿ՚б벣r(sh)l(f)ԭ______________

          鿴𰸺ͽ>>

          Ŀ (li)Դ

          }ĿijƷƵ늟ˮָ(bio)±(dng)(ni)ˮr(sh)~늉¼ӟԄ(dng)Ҫĕr(sh)gO(sh)늟ܷųğȫˮˮıȟݞt

          A. ӟr(sh) B. ӟ

          C. D. ˮյğ

          鿴𰸺ͽ>>

          ͬ(x)(c)