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ExpressingtemperatureriseindifferentDuringaheatingprocess,thetemperatureofasystemrisesby10℃.ExpressthisriseintemperatureinK,℉andR.AbsolutepressureofavacuumAvacuumgageconnectedtoachamberreads5.8psi wheretheatmospherepressureis14.5psi.Determinethe pressureinthechamber.MeasuringpressurewithaAmanometerisusedtomeasurethepressurein . hasaspecificgravityof0.85,andthemanometer heightiscm,asshowninFig.1-1.Ifthelocalatmosphericpressure determinetheabsolutepressurewithin Measuringpressurewithamulti-fluid
FIGURE1-Thewaterin ispressurizedbyair,andthe measuredbyamulti-fluidmanometerasshowninFig. islocatedonamountainatanaltitudeof1400 theatmosphericpressureis85.6kPa.Determinethe in ifh1=0.1m,h2=0.2m,andh3=0.35m.Take ofwater,oil,andmercurytobe1000kg/m3,850kg/m3, 600kg/m3respectively.Effectofpistonweightonpressurea
FIGURE1-Thepistonofaverticalpiston-cylinderdevicecontaining gasamassof60kgandacross-sectionalareaof0.04m2,as showninFig.1-3.Thelocalatmospherepressureis0.97bar,andthegravitationalaccelerationis9.81m/s2.(a)Determine insidethecylinder.(b)Ifsomeheatistransferredtothe volumeisdoubled,doyouexpectthepressureinsidethe tochange?Burningofflunch
FIGURE1-A90-kgmanhadtwohamburgers,aregularservingofFrenchfries,anda200-mlCokeforlunch.Determinehowlongitwilltakeforhimtoburnthelunchcaloriesoff(a)bywatchingTVand(b)byfastswimming.Whatwouldyouranswersbefora45-kgman?BurningofacandleinaninsulatedAcandleisburninginawell-insulatedroom.Takingtheroom airpluscandle)asthesystem,determine(a)ifthereisanyheat burningprocessand(b)ifthereisanychangeintheinternal thesystem.Boundaryworkduringaconstant- Arigid containsairat500kPaand150℃.Asaresultofheatthesurroundings,thetemperatureandpressureinsidethe
droptoand400kPa,respectively.DeterminetheboundaryworkdoneduringtheFIGURE1-IsothermalcompressionofanidealApiston-cylinderdeviceinitiallycontains0.4m3ofairat100kPaand80℃.Theairisnowcompressedto0.1m3insuchawaythatthetemperatureinsidethecylinderremainsconstant.Determinetheworkdoneduringthisprocess.HeattransferfromConsider standinginabreezyroomat thetotalrateofheattransferfrom ifthe areaandtheaverageoutersurfacetemperatureof 1.6m2and29℃,respectively,andtheconvectionheatcoefficientis6W/m2.℃(Fig.1-7)
F習(xí)ExpressingtemperatureriseindifferentDuringaheatingprocess,thetemperatureofasystemrisesby10℃.ExpressthisriseininK,℉andAbsolutepressureofavacuumAvacuumgageconnectedtoachamberreads5.8psi wheretheatmospherepressureis14.5psi.Determinethe pressureinthechamber.MeasuringpressurewithaAmanometerisusedtomeasurethepressurein . hasaspecificgravityof0.85,andthemanometer heightiscm,asshowninFig.1-1.Ifthelocalatmosphericpressure determinetheabsolutepressurewithin Measuringpressurewithamulti-fluid
FIGURE1-Thewaterin ispressurizedbyair,andthe measuredbyamulti-fluidmanometerasshowninFig. islocatedonamountainatanaltitudeof1400 theatmosphericpressureis85.6kPa.Determinethe in ifh1=0.1m,h2=0.2m,andh3=0.35m.Take ofwater,oil,andmercurytobe1000kg/m3,850kg/m3, 600kg/m3respectively.Effectofpistonweightonpressurea
FIGURE1-Thepistonofaverticalpiston-cylinderdevicecontaining gasamassof60kgandacross-sectionalareaof0.04m2,as showninFig.1-3.Thelocalatmospherepressureis0.97bar,andthegravitationalaccelerationis9.81m/s2.(a)Determine insidethecylinder.(b)Ifsomeheatistransferredtothe volumeisdoubled,doyouexpectthepressureinsidethe tochange?Burningofflunch
FIGURE1-A90-kgmanhadtwohamburgers,aregularservingofFrenchfries,anda200-mlCokeforlunch.Determinehowlongitwilltakeforhimtoburnthelunchcaloriesoff(a)bywatchingTVand(b)byfastswimming.Whatwouldyouranswersbefora45-kgman?7.BurningofacandleinaninsulatedAcandleisburninginawell-insulatedroom.Takingtheroom(thecandle)asthesystem,determine(a)ifthereisanyheattransferburningprocessand(b)ifthereisanychangeintheinternalthesystem.airplustheduringthisenergy8.Boundaryworkduringaconstant-Arigidcontainsairat500kPaand150℃.Asaresultofheattransfertothesurroundings,thetemperatureandpressureinsidethedropto65℃and400kPa,respectively.Determinetheboundaryworkdoneduringtheprocess.FIGURE1-IsothermalcompressionofanidealApiston-cylinderdeviceinitiallycontains0.4m3ofairat100kPaand80℃.Theairisnowcompressedto0.1m3insuchawaythatthetemperatureinsidethecylinderremainsconstant.Determinetheworkdoneduringthisprocess.HeattransferfromConsider standinginabreezyroomat thetotalrateofheattransferfrom ifthe areaandtheaverageoutersurfacetemperatureof 1.6m2and29℃,respecti
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