二注备考攻略.pdf

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1、ENGG18022012Assignment1Dueby5:00pmFriday19October2012(10%)•YouMUSTcompletetheseassignmentquestionsindependently.•Whenyousubmityourassignment,astatementpagewithyoursignaturemustbeattachedtoshowthat“ThisismyownworkwhichIwasindependentlycompleting”.•YourassignmentMUSTbeinamanilafolder

2、oritwillnotbemarked.•DonotforgetwritingyourstudentnameandSIDclearly.•Youmustwritethetutorialgroupcodeyoubelongtoincludingthenameofyourtutor(checkthesefromthecoursewebsite).Otherwise,asignificantdelayofreturningyourmarkedassignmentmayoccur.•YoushouldhandinyourassignmenttoyourtutorOR

3、•IfyouareinStream1,theassignmentistobesubmittedtotheAssignmentbox,Level2oftheCivilEng.Building.•IfyouareinStream2,theassignmentistobeputintheAssignmentbox,Level3oftheMechanicalEng.building.•NOTE:Latesubmissionswillbepenalized10%offullmarkforeverydayorpartthereofthattheassignmentisl

4、ate.Thisassignmentshouldtakeanaveragestudentnomorethan12hourstocomplete.ENGG18022012Question1:AsshowninFigure1,theloadingsystemconsistsoffiveforcesandtwocouples.Thetwo64Nforcesareparalleltoeachotherandperpendiculartothebar.Moreover,thebarandthesetwoforcesarealsoinaplanewhichisparal

5、leltothex-zplane.(a).ReplacetheloadingsystemshowninFigure1byanequivalentforce-couplesystematpointA.Adiagramclearlyshowingtheforce-couplesystemisrequired.(b).ShowthattheresultantforceisNOTperpendiculartothecouple.Replacetheforce-couplesystematA,byanequivalentwrenchandstatewhetheriti

6、sapositiveornegativewrench.(c).Determinethemagnitudeofthemomentofthewrench.(d).Findthecoordinatesofthepointinthex-zplacethroughwhichthelineofactionofthewrenchpasses.120mm20N-m48N120mm100mm20N-m40N100mm40N30N-m72N30N-m64N72N80mm64N40mm64N80mm30°64N60mm40mm30°60mmFigure1ENGG18022012Q

7、uestion2:Anasymmetricbucket1.20mtallby1.0mwideasshowninFigure2issupportedbypivotsPandP′,whichareverticallyabovetheapex.PointOisthemidpointofP-P′,directlyabovepointA(seeFigure2a).Thebucketwallsarenon-uniformsuchthatwhenempty,thecentreofmassofthebucketisatpointDonthelineOA,50.5cmbelo

8、wpointO(Figure2b).Themasso