Rotational Motion(转动)

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1、Chapter8rotationalmotion Kinematics1.Whatistheangulardisplacementofeachofthefollowinghandsofaclockin1h?Stateyouranswerinthreesignificantdigits.(a).thesecondhand.(b).theminutehand.(c).thehourhand.2.Arotatingtoyaboveababy’scribmakesonecompletecounterclockwiserotationin1min.A.Whatisit

2、sangulardisplacementin3min?B.Whatisthetoy’sangularvelocityinrad/min?C.Iftheboyisturnedoff,doesithavepositiveornegativeangularacceleration?Explain.3.Ifatruckhasalinearaccelerationof1.85m/s2andthewheelshaveanangularaccelerationof5.23rad/s2,whatisthediameterofthetruck’swheels?4.Thetru

3、ckinthepreviousproblemistowingatrailerwithwheelsthathaveadiameterof48cm.a.Howdoesthelinearaccelerationofthetrailercomparewiththatofthetruck?b.Howdotheangularaccelerationsofthewheelsofthetrailerandthewheelsofthetruckcompare?5.Youwanttoreplacethetiresonyourcarwithtiresthathavealarger

4、diameter.Afteryouchangethetires,fortripsatthesamespeedandoverthesamedistance,howwilltheangularvelocityandnumberofrevolutionschange?6.IftheradiusofaCDis6.0cmandtheangularvelocityis5.0rad/s.Whatisthelineardisplacementofapointontheedgeis2.0s?(A).0.30m(B).0.60m(C).3.8m(D).60mTorque1.Ad

5、oor(seenfromaboveinthefiguresbelow)hashingesonthelefthandside.Whichforceproducesthelargesttorque?Themagnitudesofallforcesareequal.第7页共7页Chapter8rotationalmotion2.Arodonahorizontaltabletopispivotedatoneendandisfreetorotatewithoutfrictionaboutaverticalaxis,asshown.AforceFisappliedatt

6、heotherend,atanangleqtotherod.IfFweretobeappliedperpendiculartotherod,atwhatdistancefromtheaxisshoulditbeappliedinordertoproducethesametorque?(A)Lsinq(B)Lcosq(C)L(D)Ltanq3.InwhichofthefollowingdiagramsisthetorqueaboutpointOequalinmagnitudetothetorqueaboutpointXinthediagram?(Allfor

7、ceslieintheplaneofthepaper.)4.A5meteruniformplankofmass100kilogramsrestsonthetopofabuildingwith2metersextendedovertheedgeasshown.Howfarcana50kilogrampersonventurepasttheedgeofthebuildingontheplankbeforetheplankjustbeginstotip?(A)0.5m(B)1m(C)1.5m(D)2m5.Auniformmeterstickofmass0.20

8、kgispivotedatthe40cmmark.W