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
答案:
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...
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
  • Itwasthegirlssawtheoldmaninthemorninghewastakingawalk. A.whothat B.whowhen C.thatwho D.thatthat
  • 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.
  • 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.
  • 在横线上填上><或=. 130﹣83﹣17130﹣83﹣17.
  • 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!
  • 直角三角形的两个锐角的和一定等于90°..判断对错
  • 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.
  • Theyarewtoeachotherforfearthattheywouldwakethesleepingchildrenup.
  • 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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