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Solved: Determine the smallest force P needed to lift the

Engineering Mechanics: Statics | 14th Edition | ISBN: 9780133918922 | Authors: Russell C. Hibbeler ISBN: 9780133918922 126

Solution for problem 8-65 Chapter 8

Engineering Mechanics: Statics | 14th Edition

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Engineering Mechanics: Statics | 14th Edition | ISBN: 9780133918922 | Authors: Russell C. Hibbeler

Engineering Mechanics: Statics | 14th Edition

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Problem 8-65

Determine the smallest force P needed to lift the 3000-lb load. The coefficient of static friction between A and C and between B and D is ms = 0.3, and between A and B m s = 0.4. Neglect the weight of each wedge.

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Chapter20-AggregateDemandandAggregateSupply • Introduction o Overthelongrun,realGDPgrowsabout3%yearonaverage o Intheshortrun,GDPfluctuatesarounditstrend. § Recessions:periodsoffallingrealincomesandrising unemployment Also-negativerealGDPfortwoconsecutivequarters § Depressions:severerecessions(veryrare) o Short-runeconomicfluctuationsareoftencalledbusinesscycles • ThreeFactsAboutEconomicFluctuations 1. Economicfluctuationsareirregularandunpredictable 2. Mostmacroeconomicquantilesfluctuatetogether 3. Asoutputfalls,unemploymentrises • Classicaleconomics—ARecap o ClassicalDichotomy,theseparationofvariablesintotwo groups: § Real–quantities,relativeprices § Nominal–measuredintermsofmoney o Theneutralityofmoney:changesinthemoneysupplyaffect nominalbutNOTrealvariables o Mosteconomistsbelieveclassicaltheorydescribestheworldin thelongrunbutnottheshortrun o Intheshortrun,changesinnominal(likethemoneysupplyorP) canaffectrealvariables(likeYortheu-rate) • TheModelofAggregateDemandandAggregateSupply o Themodeldeterminestheequilibriumpriceleveland equilibriumoutput(realGDP) • TheAggregate-Demand(AD)Curve o TheADcurveshowsthequantityofALLgoods&services demandedintheeconomyatANYgivenpricelevel • WhytheADCurveSlopesDownward Y=C+I+G+NX AssumeGisfixedbygovt.policy TounderstandtheslopeofAD,wemustdeterminehowachangein P affectsC,I,andNX 1. TheWealthEffect(PandC) SupposePrises Ø Thedollarspeopleholdbuyfewergoodsandservices,soreal wealthislower (stillhavesameamountofmoneythough) Ø Peoplefeelpoorer Result:Cfalls 2. TheInterest-RateEffect(PandI) SupposePrises Ø Buyinggoodsandservicesrequiresmoredollars Ø Togetthesedollars,peoplesellbondsorotherassets (priceofbondsgoup) Ø Thisdrivesupinterestrates Result:Ifalls (recallIdependsnegativelyoninterestrates 2 3. TheExchange-RateEffect(PandNX) SupposePrises Ø U.S.interestratesrise(theinterest-rateeffect) Ø ForeigninvestorsdesiremoreU.S.bonds Ø Higherdemandformoneyinforeignexchangemarket Ø U.S.exchangerateappreciates Ø U.S.exportsmoreexpensivetopeopleabroad,imports cheapertoU.S.residents Result:NXfalls • WhytheADCurveMightShift o AnyeventthatchangesC,I,G,orNX–exceptachangeinP— willshifttheADcurve o ChangesinC § Stockmarketboom/crash § Preferencesre:consumption/savingtradeoff § Taxhikes/cuts o ChangesinI § Firmsbuynewcomputers,equipment,factories § Expectations,optimism/pessimism § Interestrates,monetarypolicy § Investmenttaxcreditortaxincentives o ChangesinG § Federalspendinge.g.,defense § State&localspendinge.g.,roads,schools o ChangesinNX § Booms/recessionsincountriesthatbuyourexports 3 § Appreciation/depreciationresultingfrominternational speculationinforeignexchangemarket • TheAggregate-Supply(AS)Curves o TheAScurveshowsthetotalquantityofg&sfirmsproduceand sellatanygivenpricelevel o ASis § Verticalinthelongrun § Upwardslopingintheshortrun • TheLong-RunAggregate-SupplyCurve(LRAS) o Thenaturalrateofoutput(YN )istheamountofoutputthe economyproduceswhenunemploymentisatitsnaturalrate o (Y N)isalsocalledpotentialoutputorfull-employmentoutput • WhyLRASisVertical o (Y N)determinedbytheeconomy’sstocksoflabor,capital,and naturalresources,andontheleveloftechnology o AnincreaseinPdoesnotaffectanyofthese,soitdoesnot affect(N) (classicaldichotomy) • WhytheLRASCurveMightShift o Changesinnaturalresources § Discoveryofnewmineraldeposits § Reductioninsupplyofimportedoil § Changedinweatherpatternsthataffectagricultural production o Changesintechnology § Productivityimprovementsfromtechnologicalprogress • UsingAD&AStoDepictLong-RunGrowthandInflation 4 o Overthelongrun,technologicalprogressshiftsLRAStotheright andgrowthinthemoneysupplyshiftsADtotheright àResult:ongoinginflation&growthinoutput 5

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Chapter 8, Problem 8-65 is Solved
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Textbook: Engineering Mechanics: Statics
Edition: 14
Author: Russell C. Hibbeler
ISBN: 9780133918922

The answer to “Determine the smallest force P needed to lift the 3000-lb load. The coefficient of static friction between A and C and between B and D is ms = 0.3, and between A and B m s = 0.4. Neglect the weight of each wedge.” is broken down into a number of easy to follow steps, and 44 words. The full step-by-step solution to problem: 8-65 from chapter: 8 was answered by , our top Engineering and Tech solution expert on 11/10/17, 05:25PM. This textbook survival guide was created for the textbook: Engineering Mechanics: Statics, edition: 14. Since the solution to 8-65 from 8 chapter was answered, more than 538 students have viewed the full step-by-step answer. Engineering Mechanics: Statics was written by and is associated to the ISBN: 9780133918922. This full solution covers the following key subjects: coefficient, determine, Force, Friction, lift. This expansive textbook survival guide covers 11 chapters, and 1136 solutions.

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Solved: Determine the smallest force P needed to lift the