大学物理双语-练习题

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1、Chapter1ParticleKinematicsI)Chooseonecorrectansweramongfollowingchoices1.Anobjectismovingalongthex-axiswithpositionasafunctionoftimegivenbyx=x(t).PointOisatx=0.TheobjectisdefinitelymovingtowardOwhenA.B.C.D.2.Anobjectstartsfromrestatx=0whent=0.Theobjectmovesinthexdirectionwithpositivevelocityaf

2、tert=0.TheinstantaneousvelocityandaveragevelocityarerelatedbyA.B.C.D.canbelargerthan,smallerthan,orequalto3.Anobjectismovinginthexdirectionwithvelocity,andisnonzeroconstant.Withwhent=0,thenfort>0thequantityisA.Negative.B.Zero.C.Positive.D.Notdeterminedfromtheinformationgiven.4.Anobjectismoving

3、onthexy-planewithpositionasafunctionoftimegivenbyr=at2i+bt2j(aandbareconstant).Whichiscorrect?A.Theobjectismovingalongastraightlinewithconstantspeed.B.Theobjectismovingalongastraightlinewithvariablespeed.C.Theobjectismovingalongacurvedpathwithconstantspeed.D.Theobjectismovingalongacurvedpathwi

4、thvariablespeed.5.Anobjectisthrownintotheairwithaninitialvelocitym/s.Ignoretheairresistance(空气阻力).Atthehighestpointthemagnitudeofthevelocityis()(A)0(B)4.9m/s(C)9.8m/s(D)m/s6.Twobodiesarefallingwithnegligibleairresistance,sidebyside,aboveahorizontalplane.Ifoneofthebodiesisgivenanadditionalhoriz

5、ontalaccelerationduringitsdescent,itA.strikestheplaneatthesametimeastheotherbody.B.strikestheplaneearlierthantheotherbody.C.hastheverticalcomponentofitsvelocityaltered.D.hastheverticalcomponentofitsaccelerationaltered.7.Atoyracingcarmoveswithconstantspeedaroundthecircleshownbelow.Whenitisatpoi

6、ntAitscoordinatesarex=0,y=3manditsvelocityis6m/s.WhenitisatpointBitsvelocityandaccelerationare:A.-6m/sand12m/s2,respectively.B.6m/sand-12m/s2,respectively.C.6m/sand12m/s2,respectively.D.6m/sand2m/s2,respectively.8.Astoneistiedtoa0.50-mstringandwhirledataconstantspeedof4.0m/sinaverticalcircle.I

7、tsaccelerationatthebottomofthecircleis:A.9.8m/s2,upB.9.8m/s2,downC.8.0m/s2,upD.32m/s2,up9.Aboatisabletomovethroughstillwaterat20m/s.Itmakesaroundtriptoatown3.0kmupstream.Iftheriverflowsat5m/s,thetimerequiredforthisroundtripis:A.120sB.15