为了更方便监控高温锅炉外壁的温度变化,在锅炉的外壁上镶嵌一个导热性能良好的汽缸,汽缸内气体温度可视为与锅炉外壁温度相等.汽缸开口向上,用质量为m=1kg的活塞封闭一定质量的理想气体,活塞横截面积为S=1cm2.当汽缸内温度为300K时,活塞与汽缸底间距为L,活塞上部距活塞L处有一用轻质绳悬挂的重物M.当绳上拉力为零时,警报器报警.已知室外空气压强p0=1.0×105Pa,活塞与器壁之间摩擦可忽略.求: (ⅰ)当活塞刚刚碰到重物时,锅炉外壁温度为多少? (ⅱ)若锅炉外壁的安全温度为900K,那么重物的质量应是多少?
所属题库:高三下学期物理

题目介绍:
为了更方便监控高温锅炉外壁的温度变化在锅炉的外壁上镶嵌一个导热性能良好的汽缸汽缸内气体温度可视为与锅炉外壁温度相等.汽缸开口向上用质量为m=1kg的活塞封闭一定质量的理想气体活塞横截面积为S=1cm2.当汽缸内温度为300K时活塞与汽缸底间距为L活塞上部距活塞L处有一用轻质绳悬挂的重物M.当绳上拉力为零时警报器报警.已知室外空气压强p0=1.0×105Pa活塞与器壁之间摩擦可忽略.求
ⅰ当活塞刚刚碰到重物时锅炉外壁温度为多少
ⅱ若锅炉外壁的安全温度为900K那么重物的质量应是多少
,
本题为简答题收录于高三下学期物理题库中。
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YouprobablyknowwhoMarieCuriewasbutyoumaynothaveheardofRachelCarson.Oftheoutstandingladieslistedbelowwhodoyouthinkwasthemostimportantwomanofthepast100years? JaneAddams1860﹣1935 AnyonewhohaseverbeenhelpedbyasocialworkerhasJaneAddamstothank.Addanshelpedthepoorandworkedforpeace.Sheencouragedasenseofcommunity社区bycreatingsheltersandpromotingeducationandservicesforpeopleinneedIn1931AddamsbecamethefirstAmericanwomantowintheNobelPeacePrize. RachelCarson1907﹣1964 Ifitweren'tforRachelCarsontheenvironmentalmovementmightnotexisttoday.Herpopular1962bookSilentSpringraisedawarenessofthedangersofpollutionandtheharmfuleffectsofchemicalsonhumansandontheworld'slakesandoceans. SandraDayO'Connor1930﹣present WhenSandraDayO'ConnorfinishedthirdinherclassatStanfordLawSchoolin1952shecouldnotfindworkatalawfirmbecauseshewasawoman.ShebecameanArizonastatesenator参议员andin1981thefirstwomantojointheU.S.SupremeCourt.O'Connorgavethedecidingvoteinmanyimportantcasesduringher24yearsonthetopcourt. RosaParks1913﹣2005 OnDecember11955inMontgomeryAlabamaRasaParkswouldnotgiveupherseatonabustoapassenger.HersimpleactlandedParksinprison.ButitalsosetlfftheMontgmerybusboycott.Itlastedformorethanayearandkickedoffthecivil﹣rightsmovement.TheonlytiredIwaswastiredlrgivinginsaidParks. 1WhatisJaneAddamsnotedforinhistory? A.Hersocialwork B.Herlackofpropertraininginlaw C.Hereffortstowinaprize D.Hercommunitybackground 2WhatisthereasonforO'Connor'sbeingrejectedbythelawfirm? A.Herlackofpropertraininginlaw B.Herlittleworkexperienceincourt C.Thediscriminationagainstwomen D.Thepoorfinancialconditions 3Whomadeagreatcontributiontothecivil﹣rightsmovementintheUS? A.JaneAddams B.RachelCarson C.SandraDayO'Connor 4Whatcanweinferaboutthewomenmentionedinthetext? A.Theyarehighlyeducated B.Theyaretrulycreative C.Theyarepioneers D.Theyarepeace﹣lovers
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Itwasthegirlssawtheoldmaninthemorninghewastakingawalk. A.whothat B.whowhen C.thatwho D.thatthat
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小明参加市环保知识竞赛竞赛试卷的满分是80分小明得72分按这样计算如果竞赛试卷的满分是100分则小明应得分.
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下图每个正方形的边长表示1厘米请按要求画图. 1画一个直角三角形它的直角顶点的位置A33两个锐角顶点的位置分别是B53和C36. 2画出这个三角形绕点A顺时针旋转90后的图形. 3按21画出旋转前的三角形放大后的图形.
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在横线上填上><或=. 130﹣83﹣17130﹣83﹣17.
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假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. I'mgoingtovisitLEGOLAND®FloridaResortthissummerholidaywhereisamulti﹣dayvacationdestinationbuildingforkids2﹣12.I'mveryexcitedaboutthetripthatI'vebeenlookedforinformationaboutthisfantasticthemepark.LocatedinCentralFlorida'sWinterHaventheresortisjust45minutesfarfromOrlandoandTampa.Itincludesinteractive150﹣acrethemeparkwithmorethan50ridesshowsorattractionsinspiredbypopularLEGO®brandsandcharactersLEGOLANDWaterParkandafamousbotanicalgarden.LEGOLANDHotellocatedjuststepfromthethemeparkentrancefeatures152roomsandsuiteseachwithit'sownLEGOtheme.LEGOLANDBeachRetreatisalakefrontresortwith83themedbungalowsoffer166separaterooms.WithsomuchtoseeandexperiencethereIdoneedtohaveasmartplanofmytrip!
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直角三角形的两个锐角的和一定等于90°..判断对错
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Shakespeare'sGlobeExhibition&TourisauniqueinternationalresourcetoexploreShakespeare'swork.Openallyearrounditgivesyouanopportunitytolearnmoreaboutthemostfamousplaywright剧作家Shakespeareandhelpsyouseektofurthertheexperienceandinternationalunderstandingofhim. GroupVisitstotheExhibition&Tour *OpeningHours TheatreTours Monday﹣Sunday930a.m.﹣500p.m. Exhibition Monday﹣Sunday900a.m.﹣500p.m. Groupsof15peopleormorearerequiredtopre﹣booktheirvisitandeachgroupwillhaveitsownguideforfree.TomakeareservationpleasefillinaGroupRequestFormandreturnittousviaemail. *ExhibitionandTourPrices Adult$15.00 Senior60+$13.50 StudentwithvalidID$11.50 Child5﹣15$8.00 ComplimentaryEvery16thpersonfree *Gettinghere Shakespeare'sGlobe21NewGlobeWalkLondonSEl9DTUK Wehavecurrentlyimprovedsecuritywithallbagsbeingchecked.Pleasearriveingoodtimeanddonotbringanylargebagsandcheckthecalendarbeforeyourvisitorcall+4402079021500tofindoutaboutourlatestopeningtimes. Visitorsareadvisedtoarrivebypublictransportorbytaxi.ThereisacarparkonThamesExchangeonthenorthsideofSouthwarkBridgeopen24hourssevendaysaweek.CabsmaybefoundallyearroundonSouthwarkBridge.ItmayalsobepossibletopickoneupfromoutsidetheentrancehallonNewGlobeWalk. *Wheretoeat SwanatShakespeare'sGlobeservesmodernBritishseasonalfoodfordinnerafternoonteaordrinksinourbeautifulbarandrestaurantsetovertwofloorsavailableforpre﹣andpost﹣theatredining. SwanRestaurant Monday﹣Friday12noon﹣230p.m.&600p.m.﹣1030p.m. Saturday12noon﹣330p.m.&600p.m. Sunday12noon﹣900p.m. 1Whencanyoupayavisittotheexhibition? A.Fridayat1200p.m. B.Mondayat800a.m. C.Saturdayat530p.m. D.Sundayat700p.m. 2Ifagroupof20childrenvisittheExhibition&Tourwhatisrequiredforthemtodo? A.Theyneedtohireaguidethemselves. B.Theymustbeaccompaniedbyanadult. C.Theyhavetopay$160forticketsintotal. D.Theyneedtoemailforareservationinadvance. 3Whichofthefollowingappliestovisitors? A.They'reabletogetataxinearSouthwarkBridge. B.TheycanparkonthesouthsideofSouthwarkBridge. C.Theyarerequiredtodeposittheirbagsbeforeentering. D.It'smoreconvenienttodrivetherethantakingpublictransport. 4WhatcanweknowaboutSwanRestaurant? A.AfternoonteaisnotservedonSunday. B.Itservestraditionalseasonalfoodfordiner. C.Itisclosedfrom3p.m.to5p.m.onworkdays. D.Itservesthreemealsdrinksandafternoontea.
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Theyarewtoeachotherforfearthattheywouldwakethesleepingchildrenup.
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一杯糖水200克其中糖20克如果再往杯中放入50克糖此时含糖率为
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- 学校书法社团有38人比舞蹈社团的多2人舞蹈社团有多少人
- 圆的半径扩大到原来的2倍周长和面积也扩大到原来的2倍判断对错
- WaltDisneywasbornonDecember51901.Disneybecameoneofthebest﹣knownmotionpictureproducersintheworld.Heisparticularlynotedforbeingafilmproducerandapopularshowmanaswellasaninnovatorinanimationandthemeparkdesign. Disneyisfamousforhiscontributionsinthefieldofentertainmentduringthe20thcentury.HisfirstsuccesswasthroughtheseriesOswaldtheLuckyRabbitwhichwascreatedbytheDisneystudioforCharlesMintzofUniversalStudios.WhenDisneyaskedforalargerbudgetforhispopularOswaldseriesMintzrefusedandDisneyhadtoquit.LaterDisneyandhisbrotherRoyO.Disneystartedfromscratchandco﹣foundedWaltDisneyProductionsnowknownasTheWaltDisneyCompany.TodaythiscompanyhasannualrevenuesofapproximatelyU.S.﹩35billion.Thissuccessislargelyduetoanumberoftheworld'smostfamousfictionalcharactersheandhisstaffcreatedincludingMickeyMouseacharacterforwhichDisneyhimselfwastheoriginalvoice. Disneywon26AcademyAwardsoutof59nominationsincludingarecordfourinoneyeargivinghimmoreawardsandnominationsthananyotherindividual.HeisalsothenamesakeforDisneylandandWaltDisneyWorldResortthemeparksintheUnitedStatesaswellastheinternationalresortsinJapanFranceandChina. DisneydiedoflungcancerinBurbankCaliforniaonDecember151966.ThefollowingyearconstructionbeganonWaltDisneyWorldResortinFlorida.HisbrotherRoyDisneyinauguratedTheMagicKingdomonOctober11971. 1WaltDisneycanbedescribedwiththefollowingwordsexcept. A.Famous. B.Creative. C.Versatile. D.Respectful. 2WhichofthefollowingstatementisTRUEaccordingtothetext? A.WaltDisney'stalentwasnotvaluedbyhisoldbossCharlesMints. B.MickeyMousemadeagreatcontributionforTheWaltDisneyCompany. C.OswaldtheLuckyRabbitisconsideredthegreatestsuccessbyWaltDisney. D.WaltDisneyandhisbrotherstartedanewcompanywiththehelpofasponsor. 3WhichofthefollowinginformationisNOTmentionedinthetext? A.TheroadtofameandsuccessforDisney. B.MisfortunesandregretsinDisney'slife. C.Disney'stalentsinthefieldofentertainment. D.AchievementsandrecognitionthatDisneygained.
- 3吨40千克=吨0.4平方米=平方分米.
- 脱式计算能简算的要简算. ①8×27×125 ②49×99+49 ③336÷[36﹣29×6] ④80+4×25 ⑤104+172+296+28 ⑥102×15﹣438÷26
- 计算下面图形的面积.单位厘米
- 两个面积相等的三角形可以拼成一个平行四边形..判断对错
- Bodylanguageisthequietsecretandmostpowerfullanguageofall!Itspeaks1thanwords.Accordingtospecialistsourbodiessendoutmore2thanwerealize.Infactnon﹣verbalcommunication非言语交际takesupabout50%ofwhatwereally3.Andbodylanguageisparticularly4whenweattempttocommunicateacrosscultures文化.Indeedwhatiscalledbodylanguageisso5apartofusthatit'sactuallyoftenunnoticed.Andmisunderstandingsoccurasaresultofit.6differentsocietiestreatthe7betweenpeopledifferently.NorthernEuropeansusuallydonotlikehaving8contact接触evenwithfriendsandcertainlynotwith9.PeoplefromLatinAmericancountries10toucheachotherquitealot.Thereforeit'spossiblethatin11itmaylooklikeaLatinois12aNorwegianallovertheroom.TheLatinotryingtoexpressfriendshipwillkeepmoving13.TheNorwegianveryprobablyseeingthisaspushinesswillkeep144﹣whichtheLatinowillinreturnregardas15. Clearlyagreatdealisgoingonwhenpeople16.Andonlyapartofitisinthewordsthemselves.Andwhenpartiesarefrom17culturesthere'sastrongpossibilityof18.Butwhateverthesituationthebest19istoobeytheGoldenRuletreatothersasyouwouldliketobe20. 1A.straighter B.further C.harder D.louder 2A.sounds B.invitations C.feelings D.messages 3A.mean B.hope C.receive D.discover 4A.immediate B.misleading C.important D.difficult 5A.well B.far C.long D.much 6A.Forexample B.Thus C.However D.Inshort 7A.trade B.distance C.connections D.greetings 8A.eye B.verbal C.bodily D.telephone 9A.strangers B.relatives C.neighbours D.enemies 10A.inotherwords B.ontheotherhand C.inasimilarway D.byallmeans 11A.trouble B.conversation C.silence D.experiment 12A.disturbing B.helping C.guiding D.following 13A.closer B.faster C.in D.away 14A.steppingforward B.goingon C.backingaway D.comingout 15A.weakness B.carelessness C.friendliness D.coldness 16A.talk B.travel C.laugh D.think 17A.different B.European C.Latino D.rich 18A.curiosity B.excitement C.misunderstanding D.nervousness 19A.chance B.time C.result D.advice 20A.noticed B.treated C.respected D.pleased
- 用的比例尺把一个2米长的零件画在设计图上图纸上的零件长.
- Themanadmittedtheoldcomputer. A.tosteal B.tostealing C.beingstolen D.havingstolen
- 一台电视机先涨价10%再降价10%这台电视机现在的售价与原价相比
- Yesterdaywewenttoanparkwherewewerebyperformancesthatwefoundtowatch. A.amusementamusingamused B.amusementamusedamusing C.amusingamusedamusement D.amusingamusingamusement
- 计算下面环形的体积.单位cm
- 五边形可以分成3个三角形所以它的内角和是180°×3.判断对错
- ①以直线MN为对称轴作图形A的轴对称图形得到图形B. ②把图形B向右平移4格得到图形C.以点O为中心把图形C顺时针旋转90°得到图形D. ③O点的位置可以用数对表示.
- 脱式计算. 15.4÷0.3×0.06 29.6÷1.2﹣2.48÷0.4 30.75+0.65÷0.56 47.4×1.5÷0.3﹣3.7
- 一个长方体的长宽高都扩大2倍它的体积就
- Hewantedhissontobecomestrongandalikehimwhoisfondofandgoodatdifferentsports.
- 有一块长方形草坪长500米宽28米画在一张图纸上量得长是25厘米这幅图的比例尺是图中的宽是厘米.
- 甲乙两地的图上距离5cm表示实际距离20km这幅图的比例尺是.
- Whenfromthehillthebuildinglooksmorebeautiful. A.seeing B.seen C.saw D.tosee
- 以明明家为起点向东走为正向西走为负.如果明明从家向东走了30米又向西走了50米这时明明离家的距离是米.
- 小亮从家里出发向正北方向走50米到达车站再从车站向正西方向走100米到达书店然后再从书店向正南方向走50米到达学校学校在小亮家方向上距离米.
- 工地运来一批水泥第一天用去第二天用去50吨还剩这批水泥原有吨.
- Twodeerjumpedoutinfrontof16﹣year﹣oldAmandaFloyd'scar.Shesteppedonthebrakestoppingthecarjustintime.Butlatershestartedtexting.Distracted分心的Amandaturnedleftandrightthencrashedintoanothercar.Luckilyshewasn'tinarealcar﹣﹣shewasinadrivingsimulator模拟器atRooseveltHighSchoolOhioUS.IneverreallyrealizedthatcarsmakeaturnthatmuchAmandaaJuniorsaid.Sheaddedthatshewouldn'ttextwhiledrivinganymore. TheOhioDepartmentofTransportationODOTandStateHighwayPatrolbroughtthesimulatortotheschool.Theysaidtheywantedtohelpstudentslearnaboutthedangerofdrivingwhiledrunkwhiletextingorwhiletalkingonthephone. AccordingtotheNationalHighwayTrafficSafetyAdministrationdistracteddrivingclaimed34501ivesin2016alone.Expertsbelievetheactualfigureisprobablyhigher. Thesimulatorisbasicallyacomputerprogram.Likemanycomputergamesitwasahitwiththestudents.Theylinedupandcrowdedaroundtowatcheachothertaketurns.Thesimulatorhasasteeringwheel!方向盘brakeandgaspedal油门踏板.Itismadeupofthreelargecomputerscreensonatable. Studentschooseadistractionsuchasdrivingwhiledrunkortexting.Theyalwayscrashofcourse.Thentheyarepulledoverbythepolicetobetaughtthebadresultsoftheirdrivinghowmuchdamagethey'vecausedwhattheirfineisifanyonediedintheaccidentandifthey'regoingtogotoprison. ItteacheshowtodrivewithoutbeingontheroadsaidShanteThompson16.Shehadjustcrashedintoadeer. ODOTspokesmanJustinChesnicsaidhundredsofkidshavegonebehindthewheelsofar.Hesaidevenmorehavebenefitedfromwatchingtheirclassmates.Drivingissuchamajorresponsibilitysotakeitseriouslyhesaid.Putawayyourcellphone.Alotoftheaccidentsouttherearebecauseofdistracteddriving.Itcannotonlychangeyourlifebutitcanchangesomeoneelse'slifeforever.Theresultsareserious. 1WhatdoestheauthorintendtodoinParagraphOne? A.Introducethetopicofthetext. B.Illustratetheauthor'spointofview. C.Providesomeadviceforthereaders. D.Offersomebackgroundinformation. 2WhyisthedrivingsimulatorprojectintroducedtoRooseveltHighSchool? A.Itteststhestudents'abilitytostayfocused. B.Itgetsstudentstohavefunbetweenclasses. C.Itteachesstudentshowtodealwithtrafficaccidents. D.Itmakesstudentsawareofthedangersofdistracteddriving. 3Whatcanweknowaboutthedrivingsimulator? A.Itisconnectedtothelocalpolicestation. B.Itisarealcarbuthaslargecomputerscreens. C.Itattractsthestudents'interestasacomputerprogram. D.Itbenefitsthestudentswhouseitmorethanthosewhoonlywatch. 4Whatisthemainideaofthepassage? A.TrafficrulesinOhioUS. B.Dangerofdistracteddriving. C.Simulateddrivingforstudents. D.Advantagesofcomputergames.
- 小正方形边长6厘米大正方形边长7厘米.则大小正方形边长的比是多少比值是多少.
- 填空题 1圆的直径是. 2正方形的边长是.
- 某校六年级有120名师生去参观自然博物馆某运输公司有两种车辆可供选择 A限坐50人的大客车每人票价5元如满坐票价可打八折 B限坐10人的面包车每人票价6元如满坐票价可按75%优惠. 请你根据以上信息为六年级师生设计一种最省钱的租车方案并算出总租金.
- Theyoungmanwillhavethegoodsdtomorrowsoyou'llreceivethemsoon.