大学物理(西南交大)作业参考答案

※一选择题ROqOr的Pq()1qQ））；）；）；rOrPrR0QqqQ(q)R1qQ；rrR00AqB从abAr和r[B]12Q()qQ()11r11r1Ba））；）4；(-Q)A2201012()11b）；）。(2r1)r2010A=W-W＝q(U-U)[C]abab。MNEE；UU；MNMNWW；。MNNM[C]（Oq）；）-）；d()qq11R；）。R0d-q，O[D]※RQQQ内）），；）；0rr内0外Q4内Q；）0。[C]4R※6和I与+q-qεIE1r11E＞EDD；E＞EDD；εIIE212121212r22EED；（EED；[C]12121212εE.ε0r二填空题U321UUUa123出、bE＝bbaOa33q4B0a。21OArq×-8113rrq×，-8232AU，BU=。ABqqqqqqrr12111124rU=4rU=A0B031231与2R与RRR12121R2QRR从21。12QQRRQQQ，U，Q。121212RRRRRR1201021212QORR/2O5R21205Q14R。0R4R3r32R2R25R2。2URrR40000020※C0SdSC2C。2000d02三计算题xlλ0λO0xaldqdx(xa)dx，0Oxx(xa)dqdUdx，0则xx00xaalalUdUdx(laln)00∴xaoa002．b心r（（O（OaQqbqEds0，S0qq0,qq∴，内内qQqQq；外内qqU内））；aaO内001qqQq(raUUUU)。bqO内O外0R1R2R12dqrdr2durdrrO，rr000rdr(RR)uduR22221∴。2100※CUn1sCW,而C及U20，2nCnn11WCUn22，22Cnnn1AWW(n2。2CnC第十四章波动1PyAcos(t)O）P与PLOx0=A[t+L/]0=A-x-L/OP习题141图x=Lku/ωk=0,2）txtx1121）y=(t-x/)=t-x/））当t=T/4=1/8(s),x=/4=/4m处11y=T/4-/）1=/8-1/8)=myv0.4sintx/20)）tt=T/2=1/4在x=/4=/m)21/2)=-m/s3xtT4yuA0x，A习题143图0xyAt)]u40；2020160mu10m/s；2y(m)u8u，A/2O80160x(m)原点处质点的振动方程(1)(2)t20yAcos(t)82习题144图0x波方程yAt)82yAcos(4t2x)(SI)5u610s2P/Tsu400ms/或/）110yAcos[(200stx/400ms)/2]11x=mPPyAcos[(200s)t/2]1P该质点振动的初相/2m和mP0(xx)/(xx)//22121/20yAcos[(200s)(t/2]17PIPS。rIP4r2当r=r=m12IPr1.2710Wm22211IP4r3.1810Wm232228343m234I1IuAuAv1.5810Wm22222522tsSWPtt3.79J39OS、1S和Syy和y23123SSSOO213132O习题149图y=Acost+/2)11Ay=Acost222Ay=Acost/2)133A=A，A=A,在O123yA3AA2Acos(ωtπ/4)y=iSSS和3，121S2SS和212I、SSSS02211QPS1SuS21l34l12rr21，22习题1410图21A2AI4I；00rrS在122。2221x4y2.010cos100t14－220310xy2.010cos100t220233yyy4.01025xt22122kk0取0343xy2.0102cos100t2203S和SPS为；121S在PAS在PA1122PLPrrrrrL2rLSPS21，12习题1412图PAA1212LrA2AAcos12AAAA2cos22222121212SS和S12SS。xS12112x12x的PAbbxxaSbS1a222221axS2a2b2bxx22a2B2k21习题14－13图2xa2222k2x0122abbk2212xtA210T）xtyAcos22Txtyyy2A2212T112xnn3xn，221x2n1,n2xn。，222xP0OD..BOxyAcos2txODP1在PC习题14－15图4323yAcos2tAcost1PAcos2ty22P4xxyAcos2tAcost22xyyy2At122，yt0时0处，0xty2Acos2927,46又xD1212D7y2Acoscost122D3Acos2t3sinAt2＝3-51Av6.4210JmA22222622Iuw2.1810Wm321.010Wm622L1.0WmL2为LII)I00=IP。LII)0I10LI0PIS10IS1.0104LW0和2uA22I9II221212LlgII0LIIIIIIB102012。u）v25msS1uvvuvSvsuvv1uvSvsuvv2HzuvSuvvv826.2Hz0uv3S(uv)