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Y(ji)

W(wng)վزĎ(k)|r(sh)g2019-05-09 12:46:01|Ƅ(dng)ˣY(ji)

˿õijɿ(j)ץoһЕr(sh)gM(jn)Џ(f)(x)䌍(sh)ԇҊ(jin)͟o(w)ǰ12N,ĽB@12NҊ(jin)}͵Ľ}˼Sģ߀B˸߿ԇ}Ľ}ͼɣṩԇ}Ĵ}ģwĽ}׌һ͕(hu)һͨһ͌(du)!soղŶ

Y(ji)

1ֱ\(yn)(dng)(wn)}

}͸ֱ\(yn)(dng)(wn)}Ǹ߿ğc(din)ԆΪ(d)Ҳc֪R(sh)CϿ.Ϊ(d)F(xin)x}УtڿҳcDY(ji);Ӌ(j)}гF(xin)ڵһ(g)С}yȞеҊ(jin)ʽw^(gu)̆(wn)}׷(wn)}.

˼Sģ壺D(wn)}P(gun)IڌDc^(gu)̌(du)(yng)(li)ͨ^(gu)D(bio)SP(gun)Ic(din)бeϢ(du)\(yn)(dng)^(gu)M(jn)зĶQ(wn)};(du)w^(gu)̆(wn)}׷(wn)}(yng)𲽷ٸ(j)ǰ^(gu)֮gɂ(g)w֮g“(lin)ϵг(yng)ķĶǰ^(gu)̵“(lin)ϵҪٶP(gun)ϵɂ(g)wg“(lin)ϵҪλP(gun)ϵ.?

2wĄ(dng)B(ti)ƽ↖(wn)}

}͸wĄ(dng)B(ti)ƽ↖(wn)}ָwʼK̎ƽB(ti)l(f)׃Ć(wn)}.wĄ(dng)B(ti)ƽ↖(wn)}һ(g)µƽ↖(wn)}Еr(sh)ҲɌƽķƏVĂ(g)µĄ(dng)B(ti)ƽ↖(wn)}.

˼Sģ壺õ˼SЃɷN.(1)Q(wn)}Ը(j)ƽlгз̷׃;(2)Dⷨ(j)ƽlĺϳɻֽD(j)D׃.

3\(yn)(dng)ĺϳcֽ↖(wn)}

}͸\(yn)(dng)ĺϳcֽ↖(wn)}Ҋ(jin)ģЃ.һK(U)ĩٶȷֽĆ(wn)}С^(gu)ӵĆ(wn)}(wn)}P(gun)Iٶȵĺϳcֽ.

˼Sģ壺(1)K(U)ĩٶȷֽ↖(wn)}ҪעwČ(sh)HٶһǺٶֽr(sh)ɂ(g)ٶȵķ(yng)ȡK(U)ķʹֱK(U)ķ;Ѓɂ(g)wͨ^(gu)K(U)Btɂ(g)wK(U)ٶ.(2)С^(gu)ӕr(sh)ͬr(sh)cɂ(g)\(yn)(dng)һС(du)ˮ\(yn)(dng)СSˮһ\(yn)(dng)r(sh)ƽ߅ζtҲֽⷨЩ(wn)}ýЩ(wn)}tҪÈDⷨ.

4w\(yn)(dng)(wn)}

}͸w\(yn)(dng)ƽ\(yn)(dng)б\(yn)(dng)ƽ\(yn)(dng)߀б\(yn)(dng)оDzֽⷨһnjٶȷֽ⵽ˮƽQֱɂ(g).

˼Sģ壺(1)ƽ\(yn)(dng)wˮƽֱ\(yn)(dng)Qֱֱ\(yn)(dng)λƝMx=v0t,y=gt2/2ٶȝMvx=v0,vy=gt;(2)б\(yn)(dng)wQֱϒ(’)\(yn)(dng)ˮƽֱ\(yn)(dng)ڃɂ(g)Ϸքe(yng)\(yn)(dng)

5A\(yn)(dng)(wn)}

}͸A\(yn)(dng)(wn)}rɷ֞ˮƽ(ni)ĈA\(yn)(dng)Qֱ(ni)ĈA\(yn)(dng)\(yn)(dng)|(zh)ɷ֞وA\(yn)(dng)׃وA\(yn)(dng).ˮƽ(ni)ĈA\(yn)(dng)وA\(yn)(dng)Qֱ(ni)ĈA\(yn)(dng)һ׃وA\(yn)(dng).(du)ˮƽ(ni)ĈA\(yn)(dng)ڿĹP(gun)ϵR熖(wn)}Qֱ(ni)ĈA\(yn)(dng)tڿc(din)r.

˼Sģ壺

(1)(du)A\(yn)(dng)(yng)ȷwǷوA\(yn)(dng)twܵĺF=mv2/r=mr2з⼴;w\(yn)(dng)DŽوA\(yn)(dng)t(yng)wܵM(jn)ֽwָAķϵĺ.

(2)Qֱ(ni)ĈA\(yn)(dng)Է֞(g)ģͣKģֻͣ܌(du)wṩָAĵďͨ^(gu)c(din)RB(ti);ڗUģͣṩָAĻxAĵͨ^(gu)c(din)RB(ti)ٶȞ;܉ģֻͣṩxAķwc(din)r(sh)v(gR)1/2܉A\(yn)(dng)v(gR)1/2x_(ki)܉w\(yn)(dng).

6ţD\(yn)(dng)ɵľCϑ(yng)Æ(wn)}

}͸ţD\(yn)(dng)Ǹ߿c(din)ă(ni)ÿڸ߿ж(hu)F(xin)ţD\(yn)(dng)ɿɌW(xu)c\(yn)(dng)W(xu)Y(ji)(li)cֱ\(yn)(dng)ľCϑ(yng)Æ(wn)}Ҋ(jin)ģBw͎һ^(gu)̆(wn)}ҲԿR熖(wn)}Ԇ(wn)}ȃ(ni)C^(qing).w\(yn)(dng)}ĿţD\(yn)(dng)cf(wn)ɼA\(yn)(dng)ľC}Ŀ(li)lʘO.

˼Sģ壺ţDڶɞ\(yn)(dng)“(lin)ϵ(li)Ը(j)(li)\(yn)(dng)rҲԸ(j)\(yn)(dng)r(li).(du)ڶ^(gu)̆(wn)}һ㑪(yng)(j)wһһw\(yn)(dng)rֱY(ji)ҳҎ(gu).

(du)w\(yn)(dng)(wn)}(yng)oץɂ(g)ʽGMm/r2=mv2/r=mr2=mr42/T2 GMm/R2=mg .(du)A\(yn)(dng)w(pϵy(tng))ɸ(j)ʽٷ;(du)׃܉(wn)}t(yng)(j)ĹP(gun)ϵ܉׃ٸ(j)܉׃׃.

7C(j)܇Ć(dng)(wn)}

}͸C(j)܇Ć(dng)ʽЃɷNrһNԺ㶨ʆ(dng)һNԺ㶨ٶȆ(dng)һN(dng)ʽDz˲r(sh)ʵĹʽP=FvţDڶɵĹʽF-f=ma(li).

˼Sģ壺(1)C(j)܇~ʆ(dng).C(j)܇Ć(dng)^(gu)DʾڹP=Fv㶨ɹʽP=FvF-f=ma֪SٶvF،pС˼ٶaҲ،pСC(j)܇ٶȲpСļ\(yn)(dng)ֱF=fa=0@r(sh)ٶv_(d)ֵvm=P~/F=P~/f.

@N^(gu)̰l(f)(dng)C(j)ĹֻW=PtӋ(j)W=FsӋ(j)(?yn)F׃).

(2)C(j)܇Ժ㶨ٶȆ(dng).㶨ٶȆ(dng)^(gu)̌(sh)Hɂ(g)^(gu).Dʾ^(gu)1DŽ^(gu)a㶨F㶨ɹʽP=Fv֪SvPҲֱP_(d)~P~ʲ;^(gu)2ͱ~\(yn)(dng).^(gu)1ԡP_(d)ٶ_(ki)ʼ׃Y(ji)(bio)־.^(gu)2ԡٶ󡱞Y(ji)(bio)־.^(gu)1l(f)(dng)C(j)ĹֻW=FsӋ(j)㣬W=PtӋ(j)(?yn)P׃).

8ĵľCϑ(yng)Æ(wn)}

}͸ĵľCϑ(yng)Æ(wn)}һ.һwC(j)еغ㆖(wn)}ڶwϵy(tng)C(j)еغ㆖(wn)}w(dng)ܶ톖(wn)}wϵy(tng)P(gun)ϵ(غ)(wn)}.wϵy(tng)ĽMģʽɂ(g)(g)Bһwü(x)pUBăɂ(g)(g)wֱӽ|ăɂ(g)(g)w.

˼Sģ壺(wn)}Ľ}һЄ(dng)ܶغ㶨ɣC(j)еغ㶨.(1)(dng)ܶʹ÷(jin)ֻҪxw^(gu)ֱг̼(dng)ܶm^(gu);(2)غ㶨ͬm^(gu)r(sh)ֻҪЩpЩӣ(j)pٵӵз̼;(3)C(j)еغ㶨ֻغ㶨ɵһNʽW(xu)ҲdzҪ.ܶ}ĿÃɷNNɸ(j)}Ŀr`xȡ.

9W(xu)(sh)(yn)ٶȵĜy(c)(wn)}

}͸ٶȵĜy(c)ǺܶW(xu)(sh)(yn)ĻA(ch)ͨ^(gu)ٶȵĜy(c)оٶȡ(dng)ܵ׃Ҏ(gu)о׃ֱ\(yn)(dng)(yn)CţD\(yn)(dng)̽(dng)ܶ(yn)CC(j)еغȌ(sh)(yn)жҪM(jn)ٶȵĜy(c).ٶȵĜy(c)һЃɷNһNͨ^(gu)c(din)Ӌ(j)r(sh)lWƬȷʽ@Î׶Bm(x)ȕr(sh)g(ni)λƏĶоٶ;һNͨ^(gu)Tȹ߁(li)y(c)ٶ.

˼Sģ壺õһNٶȺͼٶͨҪõ׃ֱ\(yn)(dng)еăɂ(g)ҪՓvt/2=vƽ=(v0+v)/2ڦx=aT2˱MpС`ٶȕr(sh)߀Ҫõ.ùTy(c)ٶȕr(sh)y(c)Ƭͨ^(gu)Tõĕr(sh)gԓΕr(sh)g(ni)ƽٶtJ(rn)ԓc(din)˲r(sh)ٶv=d/t.

10(wn)}

}͸һNҪ늌W(xu)Ԫڌ(sh)HVđ(yng)ǚv߿֪R(sh)c(din)֮һx}ʽF(xin)yȲҪݸƽаݵěQؼĄ(dng)B(ti)(g).

˼Sģ壺

(1)ݵĸñֵ(C=Q/U)xһ(g)ʾݼ{늺ɵĶ(du)κm.(du)һ(g)_ҲǴ_(Ľ|(zh)Լ׺γߴQ)cǷ늺Ķg늄(sh)ĴСȾo(w)P(gun).

(2)ƽаݣƽаɃɘO(du)eɘOgx|(zh)(du)늳(sh)QMC=S/(4kd)

(3)Ą(dng)B(ti)P(gun)IŪЩ׃ЩDz׃ץס(g)ʽ[C=Q/UC=S/(4kd)E=U/d]ɷNrһ늺Qֲ׃(늺_(ki)Դ)ǃɘOg늉Uֲ׃(ʼKcԴB).

11늈(chng)е\(yn)(dng)(wn)}

}͸늈(chng)е\(yn)(dng)(wn)}|(zh)һ(g)C늈(chng)늄(sh)ܵW(xu)(wn)}оc|(zh)c(din)(dng)W(xu)һͬѭ\(yn)(dng)ĺϳcֽţD\(yn)(dng)P(gun)ϵW(xu)Ҏ(gu)߿мx}ҲоC^(qing)Ӌ(j)?}?.

˼Sģ壺

(1)̎펧늈(chng)е\(yn)(dng)(wn)}(yng)ăɷN˼·֢ل(dng)W(xu)˼·ҕӵ\(yn)(dng)^(gu)̷Ȼ\(yn)ţDڶɲY(ji)\(yn)(dng)W(xu)Ҏ(gu)λơٶȵ.ڹ˼·(j)늈(chng)(du)׃(j)ȫ^(gu)̵ĹP(gun)ϵ_ӵ\(yn)(dng)r(ʹЃ(yu)x).

(2)̎펧늈(chng)е\(yn)(dng)(wn)}(yng)עǷ񿼑]ӵ

|(zh)ӡxӵ΢^һ㲻Ӌ(j);

ҺΡmСȺ^һ㿼];

rҪҕwr(j)}е[lД.

(3)̎펧늈(chng)е\(yn)(dng)(wn)}(yng)ע⮋\(yn)(dng)܉EʾDڮDĻA(ch)\(yn)Î׺֪R(sh)P(gun)ϵǽ}ͻƿ.

12ڴň(chng)е\(yn)(dng)(wn)}

}͸ڴň(chng)е\(yn)(dng)(wn)}ښv߿ԇ}п^}ʽ^(jin)εx}ҲоC^(qing)Ӌ(j)}y^Ҋ(jin)}ʽN

(1)ͻ(du)傐ƝŽA\(yn)(dng)\(yn)(dng)W(xu)(돽ٶr(sh)gڵ)Ŀ;(2)ͻ(du)Ӵ⼰cW(xu)(wn)}CϷĿԌ(du)˼S;CĿ;(3)ͻ֪R(sh)ڌ(sh)Hеđ(yng)õĿԌ(du)˼SՓ“(lin)ϵ(sh)HĿ.

˼Sģ壺̎\(yn)(dng)(wn)}r(sh)ذաһ҈AҰ돽(R=mv/Bq)(T=2m/Bq)r(sh)gķ.

(1)AĵĴ_?yn)傐ƝfָA(j)fv\(yn)(dng)܉Ec(din)(һň(chng)ăc(din))fķ؃ɂ(g)傐ƝfL(zhng)Ľc(din)A.AλñضڈAһҵд.

D

(2)돽Ĵ_Ӌ(j)㣺ƽ׺P(gun)ϵԓAİ돽(\(yn)(dng)A(du)(yng)ĈAĽ)עһ(g)ҪĎ׺c(din)ٶȵƫ()ڈAĽ()ABcоĊA(нǦ)2(Dʾ)?==2.

(3)\(yn)(dng)r(sh)gĴ_t=T/2лt=s/v,Ц՞ƫTڣs܉EĻL(zhng)v龀ٶ

(li)ԴW(wng)j(lu) ؟(z)•ăHތW(xu)(x)a(chn)(qun)(wn)}Ո(qng)“(lin)ϵ҂r(sh)h


Y(ji)ɻ“(lin)W(wng)Ñṩ,D(zhun)dՈ(qng)ԭϢ,xx!
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