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1、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)｜
2、｜≠,｜｜≠(C)｜｜=,｜｜≠(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｜｜≠．accidentoccurred,thedirectpunishment
3、0.5-10,000yuan,responsibleforthedirectresponsibilityfortheaccidentandtheresponsibilityofleadership,suchasconcerningadministrativesanctionsshouldbedealtwithbythepersonnelDepartmentofthecompany.(3)personalinjuryaccidentoccurs,thedirectpunishment500-1000,whoi
4、sdirectlyresponsiblefortheaccidentresponsibility,givenoticeofcriticismand50-100economicsanctionsagainstthem.(4)toconcealtheaccident,reportedwithoutunduedelayorfalse,toinformtheadministrativeleadershipofthecriticism,resultinginseriousconsequences,thepursuit
5、ofleadership,alongwith500-1000punishment.(5)significantnearmissshouldbeattemptedasthecaseofresponsiblefortheaccidentandconstructionteaminjuriesaccidentpenaltyprovisions,mutatismutandis.Eight,shouldperformintheconstructionstandardsandspecifications,serialnu
6、mbera1GB3323-2005steelfusionweldedbuttjoints,weldingengineering-Raylightingandqualityratingof2GB11345-89steelweldsmanualmethodsofultrasonicinspectionandtestingresultsforgrade3GB50236-2002industrialpipeweldingengineeringcodeforconstructionandacceptanceoffie
7、ldequipment4HGJ222-92technicalspecificationforweldingofaluminiumanditsalloys5lowtemperaturesteelweldingprocedure6SH3525-2004petrochemicalJB/T4708-2000ofweldingprocedurequalificationforsteelpressurevessels7JB/4709-20008JB4730-2005pressurevesselweldingproced
8、uresofsteelpressurevesselNDT9JB/T4744-2000steelpressurevesselproductsmechanicalpropertiestestofweldedplateII,mechanicalequipmentinstallationengineering1GB150-982GB50128-2005verticalcylindricalsteelpressureves
