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1、物理学教程（第二版）上册习题答案第一章 质点运动学1-1 质点作曲线运动,在时刻t质点的位矢为r,速度为v,速率为v,t至(t＋Δt)时间内的位移为Δr,路程为Δs,位矢大小的变化量为Δr(或称Δ｜r｜),平均速度为,平均速率为．(1)根据上述情况,则必有( )(A)｜Δr｜=Δs=Δr(B)｜Δr｜≠Δs≠Δr,当Δt→0时有｜dr｜=ds≠dr(C)｜Δr｜≠Δr≠Δs,当Δt→0时有｜dr｜=dr≠ds(D)｜Δr｜≠Δs≠Δr,当Δt→0时有｜dr｜=dr=ds(2)根据上述情况,则必有( )(A)｜｜=,｜｜= (B)｜｜≠,｜｜≠(C)｜｜=,
2、｜｜≠(D)｜｜≠,｜｜=分析与解 (1)质点在t至(t＋Δt)时间内沿曲线从P点运动到P′点,各量关系如图所示,其中路程Δs＝PP′,位移大小｜Δr｜＝PP′,而Δr＝｜r｜-｜r｜表示质点位矢大小的变化量,三个量的物理含义不同,在曲线运动中大小也不相等(注：在直线运动中有相等的可能)．但当Δt→0时,点P′无限趋近P点,则有｜dr｜＝ds,但却不等于dr．故选(B)．(2)由于｜Δr｜≠Δs,故,即｜｜≠．但由于｜dr｜＝ds,故,即｜｜＝．由此可见,应选(C)．loanmanagement(post)review:1,approvalcriteriahave
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6、ewsignature:dateofrecordform16:qiluselfcreditforcreditcardcancellationapplicationformnameofborrowerIDnumberandcreditlimitexpirationdateyearmonthdaytoyearmonthdayyearcontractnumberself-servicecard-Idonotusecredit,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcr
7、editlinestobecancelled.Borrowersignature:date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:1-2 一运动质点在某瞬时位于位矢r(x,y)的端点处,对其速度的大小有四种意见,即(1)； (2)； (3)； (4)．下述判断正确的是( )(A)只有(1)(2)正确 (B)只有(2)正确(C)只有(2)(3)正确(D)只有(3)(4)
8、正确分析与
