OA06b Work, Energy and Power PDF

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21/09/2016

OA06b:Work,EnergyandPower

OA06b:Work,EnergyandPower Due:11:59pmonSunday,September18,2016 Youwillreceivenocreditforitemsyoucompleteaftertheassignmentisdue.GradingPolicy

PrelectureVideo:WorkandKineticEnergy ClickPlaytowatchthevideo.Answertheungradedquestionsinthevideoandthegradedfollowupquestionsatright.

PartA Twoidenticalcarsaredrivinginoppositedirectionsatthesamespeed.Theirkineticenergieshave____. ANSWER: differentmagnitudes,butthesamesign thesamemagnitude,butoppositesigns thesamemagnitudeandsign differentmagnitudesandoppositesigns

Correct Thekineticenergyofamovingobjectisalwayspositive,regardlessofthedirectionitismovingin,orthecoordinatesystemused.

PartB Amotorcycledrivesupasteeplyinclinedramp.TheworkdoneonthemotorcyclebytheEarth’sgravitationalforceis____. ANSWER: zero positive negative

Correct Whenanobject’sdisplacementhasacomponentinadirectionoppositethatofagivenforce,thatforcedoesnegativeworkontheobject.

PartC Duringacertaintimeinterval,thenetworkdoneonanobjectiszerojoules.Wecanbecertainthat____. ANSWER: theobject’sfinalspeedwasthesameasitsinitialspeed theobjectwasatrestduringthisentireinterval theobjectwasatrestattheendofthisinterval

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OA06b:Work,EnergyandPower

Correct Whenthenetworkdoneonanobjectiszero,thereisnooverallchangeintheobject’skineticenergy.

PartD Theamountofkineticenergyanobjecthasdependsonitsmassanditsspeed. Rankthefollowingsetsoforangesandcantaloupesfromleastkineticenergytogreatestkineticenergy.Iftwosetshavethesame amountofkineticenergy,placeoneontopoftheother. ANSWER:

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Thecorrectrankingcannotbedetermined.

Correct

ConceptualQuestion7.11

PartA IfthenetworkWisdoneonanobjectisnegative,theobject'skineticenergyincreasesbyanamount W. ANSWER: True False

Correct

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OA06b:Work,EnergyandPower

ConceptualQuestion7.22

PartA Onaforcevs.positiongraph,theareaunderthecurveisarepresentationof ANSWER: work. position. force. potentialenergy. kineticenergy.

Correct

PrelectureConceptQuestion8.01 PartA Twoobjectsaremovingatequalspeedalongalevel,frictionlesssurface.Thesecondobjecthastwicethemassofthefirstobject.Theyboth slideupthesamefrictionlessinclineplane.Whichobjectrisestoagreaterheight? ANSWER: Object1risestothegreaterheightbecauseitpossessesasmalleramountofkineticenergy. Object2risestothegreaterheightbecauseitcontainsmoremass. Object1risestothegreaterheightbecauseitweighsless. Object2risestothegreaterheightbecauseitpossessesalargeramountofkineticenergy. Thetwoobjectsrisetothesameheight.

Correct

PrelectureConceptQuestion8.02 PartA Twoidenticalballsarethrownverticallyupward.Thesecondballisthrownwithaninitialspeedthatistwicethatofthefirstball.Howdoesthe maximumheightofthetwoballscompare? ANSWER: Themaximumheightofthesecondballisfourtimesthatofthefirstball. Themaximumheightofthesecondballistwotimesthatofthefirstball. Themaximumheightsofthetwoballsareequal. Themaximumheightofthesecondballis1.41timesthatofthefirstball. Themaximumheightofthesecondballiseighttimesthatofthefirstball.

Correct

PrelectureConceptQuestion8.05 PartA PersonBdoestwicetheworkofpersonA,andinonehalfofthetime.HowdoesthepoweroutputofpersonBcomparetopersonA? https://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=4770660

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OA06b:Work,EnergyandPower

ANSWER: PersonBhaseighttimesthepoweroutputofpersonA. PersonBhasfourtimesthepoweroutputofpersonA. PersonBhashalfthepoweroutputofpersonA. PersonBhasthesamepoweroutputaspersonA. PersonBhastwicethepoweroutputofpersonA.

Correct ScoreSummary: Yourscoreonthisassignmentis100%. Youreceived70outofapossibletotalof70points.

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