初三物理化学.doc

Vm/S v= S/tG (N G=mg m g9.8N/kg10N/kg kg/m3 =m/V m VF N F=F1+F2F=F1F2 F1F2F(N) F=GG GF(N) F=G F(N) F=G=mg=gV GmV() F1L1= F2L2 F1 L1F2 L2 F=GS=h FGSh F= G+GS=2 h GG F= G+GS=n h nWJ W=Fs FsWW W=GhW=Fs = 100%Pw P=WtpPa P=FSpPa P=gh h m kg m=pv t C v m/s v=s/t p 3 kg/m3 p=m/v F N G=mg P Pa P=F/S W J W=Fs P w P=W/t I A I=U/R U V U=IR R R=U/I W J W=UIt P w P=W/t=UI Q J Q=cm(t-t) c C J/(kgC) 3108g 9.815C 340 1QCm(tt0)Cmt2QCm(t0t)Cmt3qQ/m4 Q/Q5QQ6Tt273K 1IQ/t2R=L/S3IU/R41QI2Rt)2QUItPtUQU2t/R ()51II1I22UU1U23RR1R24U1/U2R1/R2 ()5P1/P2R1/R261II1I22UU1U231/R1/R11/R2 RR1R2/(R1R2)4I1/I2R2/R1()5P1/P2R2/R171I1/I2U1/U22P1/P2I12/I223P1/P2U12/U2281WUItPtUQ ()2WI2RtU2t/R ()91PW/tUI ()2PI2RU2/R ()VV=PPF=GVV=P-PPVV=P-PPV=VGF=PP1-11. Vs/t 2.Vt2-Vo22as3.Vt/2V(Vt+Vo)/2 4.VtVo+at5.Vs/2(Vo2+Vt2)/21/2 6.sVtVot+at2/2Vt/2t7.a(Vt-Vo)/t VoaVo()a0a08.saT2 s(T)9.:(Vo):m/s(a):m/s2(Vt):m/s(t)(s)(s):m:1m/s=3.6km/h(1);(2),;(3)a=(Vt-Vo)/t;(4)P19/s-tv-t/P242)1. Vo0 2.Vtgt3.hgt2/2Vo 4.Vt22gh:(1)(2)ag9.8m/s210m/s2,3)1. sVot-gt2/2 2.VtVo-gt g=9.8m/s210m/s23.Vt2-Vo2-2gs 4.HmVo2/2g(5.t2Vo/g :(1):L:t:1360011000m a b 13.6FNGG=mg m=G/gg=9.89.819.8F=F1+F2 ;F1F2F=F1-F27 m=V 3 3131103311033103110312=110-4212=110-62PFN/2Pa F=PS S2U hP=gh h 3 g=9.81761.0110510.33612FGgV V3FG-TgVF4FG G FF1l1F2l22WFS 3W=Pt P W ttC1 C4.2103 4.2103114.2103QcmSt QcmStQcmStcmStSt=Q/cm67 WWUQ WUIt=U2t/R=I2Rt WPt W U I t Q PPPW/t PUI (PU2/R PI2R) W U I t Q P1110003600=3.610612N3(2)(3),11. Gmg g9.8m/s210m/s22. Fkx k(N/m)x(m)3. FFN FN(N)4. 0ffm fm5. FGm1m2/r2 G6.6710-11N?m2/kg2,6. FkQ1Q2/r2 k9.0109N?m2/C2,7. FEq EN/CqC8. FBILsin BLLB:FBILB/L:F09. fqVBsin BVVBfqVBV/B:f0:(1)k;(2);(3)fmFNfmFN;(4)P8(5)B(T)L(m)I:(A)V(m/s),q:(C);(6)21. :FF1+F2 FF1-F2 (F1F2)2. F(F12+F22+2F1F2cos)1/2 F1F2:F(F12+F22)1/23. |F1-F2|F|F1+F2|4. FxFcosFyFsinxtgFy/Fx(1)();2,;(3),;(4)F1F2,F1F2();51. (,2. FmaaF/ma,3. F-F,FF4. F0 5. FNGFNG 6. P67:,1. F-kx F:k:x:Fx2. T2(l/g)1/2 l:(m)g:r3. ff4. :ffAmaxP1755. P26. vs/tf/T7. (0332m/s20:344m/s30:349m/s()8. 9. ()10. :P2111. 12. (1)rr0fr0ffF(4)r10r0ff0F0E013. W+QU()W:(J)Q:(J)U:(J)P401. Tt+273 T:(K)t:()V1m3103L106mLp1atm1.013105Pa76cmHg(1Pa1N/m2)2. 3. p1V1/T1p2V2/T2 PV/TT1WUItPttI2RtUQ(WtI2Rt)J KWh 1KWh3.6106 10A20A220V10A20A2200W50Hz50Hz3000R/KWh1KWh3000P3.6106W2PW/tUII2RPI2R3P2P1/n1/n245QIRtQ=I2RtUIttQUItt6789361.8m = S / t 1m / s = 3.6 Km / h= 340m / sC = 3108 m /s = m / V 1 g / c m3 = 103 Kg / m3 F = F1 - F2F = F1 + F2 F1F2F1F2 p = F / Sp =g h p = F / Sp =g hp =g h1 = 76 cmHg = 1.01105 Pa = 10.3 m F = G C FF = G F = G =g V 123FG F =G =F G F1 L1 = F2 L 2 F = G / nF =G + G/ nSF = n SG n W = F S = P t 1J = 1N?m = 1W?