Solution manual of thermodynamics by cengel

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Thermodynamics C On a downhill roadthepotentialenergyofthe bicyclist isbeingconverted tokinetic energy,andthusthebicyclist picksup speed. There isno creation ofenergy,and thusnoviolation ofthe conservation ofenergyprinciple. Usinga level meter a device withan airbubblebetween two marksofa horizontal watertube it can shown thatthe roadthat looksuphill tothe eyeisactuallydownhill.

It violatesthe second lawofthermodynamics. Mass, Force, and Units C In thisunit,the word light refersto thespeedoflight. The light-yearunit isthen theproduct ofa velocityandtime. Hence,thisproduct formsa distance dimensionandunit. One pound-force isthe force required toaccelerate a massof In otherwords,the weight ofa 1-lbmmassat sea level is1 lbf.

Itsweight isto be determined. AnalysisApplyingNewton'ssecondlaw,the weight isdetermined tobe 2 kg 9. Itsweightisto be determined. AnalysisApplyingNewton'ssecondlaw,the weight isdetermined tobe 2 2 1 lbf 10 lbm The netupwardforce acting ona man in the aircraft isto be determined.

The percentreductionin the weight ofan airplanecruising at 13,misto be determined. PropertiesThegravitational accelerationg isgivento be 9. DiscussionNote that the weightlossat cruisingaltitudesisnegligible. Theweight ofthe combinedsystemisto be determined. AssumptionsThe densityofwaterisconstant throughout.

The accelerationofthe rock isto be determined. AnalysisTheweight ofthe rock is 2 2 1 N 2 kg 9. The entiresolution byappropriate software isto be printedout,includingthe numericalresultswithproperunits. AnalysisTheproblemissolvedusing EES,andthe solutionisgivenbelow. The amount ofelectricenergyusedin kWh and kJ are to be determined. It isto be determined howmuchhe willweighonthe springandbeam scalesin space. Analysis a Aspring scalemeasuresweight,which isthe localgravitationalforce appliedon a body: 2 2 1 lbf lbm 5.

Based onunit considerationsalone,a relationisto be obtainedforthe fillingtime. AssumptionsGasoline isan incompressible substance and theflowrate isconstant. AnalysisThefillingtimedependsonthe volumeofthe tank andthedischargerate ofgasoline. Therefore,the independent quantitiesshouldbe arranged such that we end upwith the unitofseconds.

Systems, Properties, State, and Processes CCarbondioxide isgenerated bythe combustionoffuel in the engine. Any systemselectedforthisanalysismust include thefuel andairwhileit isundergoing combustion. The volume that containsthisair-fuelmixturewithinpiston- cylinderdevice canbe usedforthispurpose. One canalso place the entire engine ina control boundary andtrace the system-surroundingsinteractionsto determine the rate at which theengine generatescarbondioxide. Thisincludesall streamsenteringorleavingthe lake,anyrain fallingon thelake,any waterevaporated tothe air above thelake,any seepageto the underground earth,andanyspringsthatmay be feedingwaterto the lake.

Pressure,temperature,and watercontent i. But,other propertieslike windspeed and chemicalcomposition i. Assuming that the aircompositionand velocitydo not change andthatno pressure front motion occursduringthe day,the warmingprocessisone ofconstant pressure i. Hence,specific weight isan intensive property. Ifwe divide a systemintosmallerportions,eachportionwill containfeweratomic particlesthan the original system.

The numberofmolesistherefore an extensive property. Many engineeringprocessescan be approximated asbeingquasi-equilibrium. The work output ofa device ismaximumand the work input to a deviceisminimumwhen quasi-equilibriumprocessesare usedinstead ofnonquasi-equilibrium processes.

Arelationforthe variationof densitywith elevation isto be obtained,thedensity at 7 kmelevationisto be calculated,and the massofthe atmosphere using the correlationisto be estimated. Assumptions 1 Atmosphericairbehavesasan ideal gas. The operation ofthese two thermometersisbased onthe thermal expansionofa fluid. If the thermal expansioncoefficientsofbothfluidsvarylinearly withtemperature,thenboth fluidswill expandat the same rate with temperature,andboth thermometerswill alwaysgive identical readings.

Otherwise,the tworeadingsmay deviate. The direction ofheat transfer isto be determined. AnalysisHeat transferoccursfromwarmerto coolerobjects. Therefore,heat will be transferredfromsystemB to systemA until bothsystemsreachthe same temperature. Analysis Usingtheconversionrelationsbetweenthe varioustemperaturescales, F It isto be expressed in K. AnalysisThisproblemdealswithtemperature changes,whichare identical in Kelvin andCelsiusscales.

AnalysisThisproblemdealswithtemperature changes,whichare identical in Rankineand Fahrenheitscales. Analysis Usingtheconversionrelation betweenthe temperature scales, F 32 32 C 1. Analysis Usingtheconversionrelation betweenthe temperature scales, F 1. Pressure, Manometer, and Barometer CThe pressurerelative to theatmosphericpressure iscalled the gage pressure,andthepressure relative to an absolute vacuumiscalledabsolute pressure. Need an account? Click here to sign up.

Download Free PDF. Samuel Mamahit. A short summary of this paper. Cengel Boles Thermodynamics 5th Edition Solution Manual Do you enjoy reading or your need a lot of educational materials for your work? These days it has become a lot easier to get books and manuals online as opposed to searching for them in the stores or libraries.

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