}Ŀ؊W\(yn)(hu)gһNh(hun)τ(dng)܇ڸ(chng)^֮gτ(dng)܇(dng)r(sh)(ni)ȼC(j)늳ͨ^(gu)ijNʽ܇݆ݔ(dng)Ҫ늳(ch)^(gu)͕r(sh)(ni)ȼC(j)(dng)ȿ܇݆ݔҲͬr(sh)o늳س(dng)܇vҪȫٕr(sh)(ni)ȼC(j)늳߀ͬr(sh)܇݆ݔһy(c)ԇˆT{ԓ܇ƽֱ·τ0.5h^xPl(f)F(xin)@Εr(sh)g(ni)܇(ni)ȼC(j)ȼ 4.475kg܇ٞ50km/h늳ؽM(ch)ֵ60%ӵ80%늳ؽM(ch)ֵ1.08108J܇ʹüg(sh)փ(c)y(c)ԇˆTl(f)F(xin)ԓ܇ʹõȼ͵ğֵ4.0107J/kg܇r(sh)f܇vP(gun)ϵDʾ
1τ(dng)܇(dng)r(sh)늳 D(zhun)܇ ܣ
2ԓ܇ڜy(c)ԇ^(gu)Ѓ(ni)ȼC(j)ĠǶ٣
3ԓ܇ڜy(c)ԇ^(gu)늳ؽM(ch)˶
4ԇӋ(j)ԓ܇(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)܇(dng)r(sh)늳ذу(ch)ĻW(xu)D(zhun)܇C(j)еܣ2ɈD֪(dng)܇ٶȞ50km/hr(sh)܇ܵ2000N܇\(yn)(dng)ƽlã܇F=f=2000Nv=s/t܇ͨ^(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%
Ŀ (li)Դ }ͣ
}Ŀ1.6mվڸ1mվƽRǰ2m̎Rе__________mƽR________mƽR0.5mtľx________mһKľRӺ1m̎Dʾ@r(sh)________""RпԼ
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}Ŀ(sh)(yn)Ҟṩģһ(g)늉һ(g)_(ki)P(gun)ԴֵԼɌ(do)Ո(qng)ṩɜy(c)ͨ^(gu)
СČ(sh)(yn)
(sh)(yn)Ҟṩģһ(g)늉һ(g)_(ki)P(gun)ԴֵԼɌ(do)Ո(qng)ṩɜy(c)ͨ^(gu)
СČ(sh)(yn)
Ո(qng)?jin)δɵ·DDףе
̎m(dng)?sh)Ԫ?ho)ʹ·DB ___________
Ո(qng)î挧(do)DҵČ(sh)DB_______________________
(sh)(yn)늉ʾ(sh)Dʾ˕r(sh)y(c)õ늉ֵ________
\(yn)ÚWķӋ(j)Եõͨ^(gu)
________
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}ĿDʾ·Դ늉ֲ׃R1=5R2=10R3=5]_(ki)P(gun)S늉ʾ(sh)1.5VtԴ늉________ Vͨ^(gu)·________ A늉?y)Q]_(ki)P(gun)Sʾ(sh)________ A
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}ĿijͬW(xu)̽c늉P(gun)ϵO(sh)Ӌ(j)Dʾ·D
1Ո(qng)(j)·D(sh)Da(b)____
2]_(ki)P(gun)ǰD׃ĻƬPҪƵ________ˣAB
3ͨ^(gu)(sh)(yn)є(sh)(j)ӛڱһУ һ R=15
U=4V
ɱһɵã________һr(sh)c늉ȣ
ɱɵã늉һr(sh)________c________ɷȣԓ(sh)(yn)Уֵ5Q10ҪCɶ˵늉ֲ׃׃·еֵ(yng)׃________С
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}ĿijͬW(xu)һ(do)@һöFƳһ(g)늴FDʾ·оĴ늴F^ᘵĔ(sh)Ŀ࣬дʩе
A. ȡ늴FеF
B. (dng)׃ĻƬһ(dng)
C. pF@Ȧє(sh)
D. 늳صؓ(f)O(du){(dio)
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}Ŀо늄(dng)C(j)Ĺ^(gu)̡
(1)늄(dng)C(j)ĹԭǴň(chng)(du)______áDȦ҃߅abcd෴ԭ______ȦĈDʾλD(zhun)(dng)______ȺȦǡ_(d)ƽλKͣԓλá
(2)҈DеľȦԳm(x)D(zhun)(dng)?yn)b______ԓbھȦ______(xD(zhun)D(zhun)D(zhun)^(gu))ƽλÕr(sh)Ԅ(dng)׃Ȧе
(3)ٱDʾ늄(dng)C(j)ģУ{(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
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}ĿD(a)ʾֱABǹ⻬ľcķֽ羀(ľc̎ͬһˮƽ)Ȼʹһ(g)СS(pxC(j)ϵľS)cֱABһǶȵķPOٝL(dng)ԿSϝL(dng)ķl(f)˸׃D(b)ʾһĿ՚б벣Еr(sh)Ҳl(f)˸׃
(1) ɈD(a)֪(dng)Sļ݆|r(sh)ٶȵĴС______ (x׃С׃׃)˕r(sh)݆ٶȵĴС_____(x׃С׃׃)
(2) ĈD(a)(b)ɷNƬF(xin)֪ɿ՚б벣r(sh)l(f)ԭ______________
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}ĿijƷƵ늟ˮָ(bio)±(dng)(ni)ˮr(sh)~늉¼ӟԄ(dng)Ҫĕr(sh)g
O(sh)늟ܷųğȫˮˮıȟݞ
t
A. ӟr(sh) B. ӟ
C. ~ʞ D. ˮյğ
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