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图甲为一小型发电机的示意图,发电机线圈内阻为1Ω,灯泡L的电阻为9Ω,电压表为理想交流电压表.发电机产生的电动势e随时间t按图乙的正弦规律变化,则( )
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交流发电机的发电原理是矩形线圈在匀强磁场中绕垂直于磁场的轴OO′匀速转动.一小型发电机的线圈共220
如图所示甲为一台小型发电机构造示意图线圈逆时针转动产生的电动势随时间变化的正弦规律图象如图乙所示发电
电压表的示数为6V
发电机的输出功率为4W
在l.0×10
-2
s时刻,穿过线圈的磁通量最大
在0.5×10
-2
s时刻,穿过线圈的磁通量变化率最大
图甲是小型交流发电机的示意图在匀强磁场中一矩形金属线圈绕与磁场方向垂直的轴匀速转动产生的电动势随时间
t=0时刻穿过线圈磁通量最大
每秒钟内电流方向改变50次
灯泡两端的电压为22V
0~0.01s时间内通过灯泡的电量为0
图甲为一台小型发电机构造示意图线圈逆时针转动产生的电动势随时间变化的正弦规律图象如图乙所示.发电机线
电压表的示数为6V.
在t=0.01 s时,穿过线圈的磁通量为零
若线圈转速变为25 r/s,则电动势有效值为3V.
若线圈转速变为25 r/s,则通过电灯的电流为1.2A.
一台小型发电机产生的电动势随时间变化的正弦规律图象如图甲所示已知发电机线圈内阻为5.0则外接一只电阻
电压表V.的示数为220v
电路中的电流方向每秒钟改变50次
灯泡实际消耗的功率为484w
发电机线圈内阻每秒钟产生的焦耳热为24.2J
一台小型发电机产生的电动势随时间变化的正弦规律图象如图甲所示已知发电机线圈内阻为5.0则外接一只电阻
电压表的示数为220v
电路中的电流方向每秒钟改变50次
灯泡实际消耗的功率为484w
发电机线圈内阻每秒钟产生的焦耳热为24.2J
交流发电机的发电原理是矩形线圈在匀强磁场中绕垂直于磁场的轴OO’匀速转动一小型发电机的线圈共220匝
一台小型发电机的原理示意图如图甲所示单匝矩形线圈绕垂直于磁场的轴匀速转动发电机产生的电动势随时间变化
电压表的示数为
线圈转到如甲图所示位置时感应电动势为零
当
时线圈中的磁通量最小为零
当
时线圈中的磁通量最大为
一台小型发电机产生的电动势随时间变化的正弦规律图象如图甲所示已知发电机线圈内阻为5.0则外接一只电阻
电压表
的示数为220v
电路中的电流方向每秒钟改变50次
灯泡实际消耗的功率为484w
发电机线圈内阻每秒钟产生的焦耳热为24.2J
2015年·白山二模一台小型发电机产生的电动势随时间变化的正弦规律图象如图甲所示.已知发电机线圈内阻
电压表的示数为220V
电路中的电流方向每秒钟改变100次
灯泡实际消耗的功率为484W
发电机线圈内阻每秒钟产生的焦耳热为24.2J
一台小型发电机产生的电动势随时间变化的正弦规律图象如下图甲所示已知发电机线圈内阻为5.0Ω则外接一只
交流发电机的发电原理是矩形线圈在匀强磁场中绕垂直于磁场的轴OO′匀速转动一小型发电机的线圈共220匝
如图所示甲为一台小型发电机构造示意图线圈逆时针转动产生的电动势随时间变化的正弦规律图象如图乙所示发电
电压表的示数为6V
发电机的输出功率为4W
在l.0×10
-2
s时刻,穿过线圈的磁通量最大
在0.5×10
-2
s时刻,穿过线圈的磁通量变化率最大
交流发电机的发电原理是矩形线圈在匀强磁场中绕垂直于磁场的轴OO′匀速转动.一小型发电机的线圈共220
一台小型发电机产生的电动势随时间按正弦变化的规律如图7甲所示.已知发电机线圈内阻为5.0Ω现外接一只
电压表的示数为220V.
电路中的电流方向每秒钟改变50次
在t=10
-
2
s的时刻,穿过线圈的磁通量为零
发电机线圈内阻每秒钟产生的焦耳热为24.2J.
交流发电机的发电原理是矩形线圈在匀强磁场中绕垂直于磁场的轴OO′匀速转动.一小型发电机的线圈共220
8分交流发电机的发电原理是矩形线圈在匀强磁场中绕垂直于磁场的轴OO′匀速转动.一小型发电机的线圈共2
一台小型发电机产生的电动势随时间变化的正弦规律图像如图甲所示已知发电机线圈内阻为5.0Ω外接一只电阻
电压表的示数为220V.
电路中的电流方向每秒钟改变50次
灯泡实际消耗的功率为484W.
发电机内阻每秒钟产生的焦耳热为24.2J.
交流发电机的发电原理是矩形线圈在匀强磁场中绕垂直于磁场的轴OO′匀速转动.一小型发电机的线圈共220
一台小型发电机产生的电动势随时间变化的正弦规律图象如图甲所示已知发电机线圈内阻为5.0欧则外接一只电
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HigherEducationINTHEUnitedStates HighereducationintheUnitedStatesincludesanyprogramofstudyattwo﹣year﹣collegesfour﹣yearcollegesandgraduateschools.Therearemorethan4100communitycommunitycollegescollegesanduniversitiesintheUnitedStates.Four﹣yearcollegesgrantundergraduatebachelor'sdegreesB.A.orB.S..Two﹣yearcollegesoftencalledcommunitycollegesoffertheAssociateofArtsortheAssociateofSciencedegreesA.A.orA.S.Thewordscollegeanduniversityareoftenthesamebutitisgenerallyunderstoodthatauniversitycanoffergraduatedegreesaswell.ThesedegreescanbequitespecializedsuchasaMasterofArtsinaparticularsubjectorevendoctoratedegrees. Americancollegesanduniversitiesmaybepublicprivateorreligiouszōng jiāo 的.Publicuniversitiesareownedbythestates.Studentspaytuition学费atpublicuniversitiesbutthosewhohavelivedinthestateforacertainperiodoftimedonotpayasmuchasstudentsfromoutsidethestate.Theannualaveragecostoftuitionfeesandroomandboardatuniversitieswas$36564in2014.Thesecostshoweverdependonthesizelocationreputation声誉etc.oftheuniversity. Privateandreligiousinstitutionscanbeveryexpensivebecausetheydonotreceivethesametypeoffundingthatpublicschoolsdoalthoughtheymaygetsomemoneyfromthestateforcertainprograms.SomeAmericanprivateuniversitiesareconsideredthebestinthenationifnotintheworldbutthecostsoftheseschoolsareveryhigh.Itisusuallynotnecessarytobeamemberofaparticularregiontoattendthereligiousschool. Lasttherearealsosometechnicalinstitutionsthatareprivatelyownedlikebusiness.Thesetechnicalinstitutesoffertwo﹣yearprogramsinsuchfieldsasautomotiveengineeringbusinessandelectronics.Thetrainingisveryspecializedandthegoalsofthestudentsarespecificallyrelatedtoaparticularoccupation. 1.Whatdegreesdothecommunitycollegesoffer? A.Bachelor'sdegrees B.Master'sdegrees. C.A.A.orA.S. D.Doctoratedegrees. 2.What'sthedistinctivefeatureofpublicuniversities? A.Roomandboardarefree. B.Theyaresupportedbythestates. C.Theaveragecostisover﹩36564peryear. D.Studentsfromdifferentstatespaythesametuition. 3.Whydosomepeoplechoosetoattendprivateuniversities? A.Theyreceivefundingfromthegovernment. B.Theyarelocatednearwherestudentslive. C.Theyareexcellentineducation. D.Theyprovidesomefinancialhelp. 4.Wherecanwepossiblyfindthetext? A.Afashionmagazine B.Astorybook C.Atravelguide D.Agovernmentwebsite
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Pleasetheseproblemsaschallenges. A.search B.regard C.look D.make
Imaginebeingbornwithoutarms.Noarmstohugsomeoneandnohandsto1touch.Orwhataboutbeingbornwithoutlegs?Havingno2todancewalkrunorevenstandontwofeet.Nowputbothofthosescenestogether:noarmsandnolegs.Howwouldthat3one'severydaylife? WithoutanymedicalexplanationNickVujiciccameintotheworldwithneitherarmsnorlegs.Imaginethe4hisparentsfeltwhentheysawtheirbabybeingwhattheworldwouldconsiderimperfectand5.Littledidtheyknowthatthisbeautifullimblessbabywouldonedaybesomeonewhowould6andmotivatepeoplefromallwalksoflife. ThroughouthischildhoodNickdealtwiththe7ofself﹣respectandstruggledwithdepressionand8.AsNickgrewuphelearnedtodealwithhis9andstartedtobeabletodomoreandmorethingsonhisown.He10tohissituationandfoundwaysto11tasksthatmostpeoplecouldonlydobyusingtheirlimbssuchascleaningteeth12hairtypingonacomputeretc.Astime13Nickbegantoeagerlyaccepthis14andachievegreaterthings. Nickgotadoublebachelor'sdegree15inaccountingandfinancialplanning.Bytheageof19Nickhadstartedto16hisdreamofencouragingothersbysharinghisstorythrough17speaking.Hefoundthepurposeofhis18.Nowat27yearsoldhehasaccomplishedmorethanmostpeople.Hehastravelledaround19hisstorywithmillionsofpeople.Heisatrueinspirationalandmotivational20. 1.A.understand B.experience C.know D.prevent 2.A.ability B.interest C.reason D.chance 3.A.affect B.limit C.improve D.design 4.A.calmness B.excitement C.shock D.eagerness 5.A.unique B.abnormal C.extraordinary D.unqualified 6.A.teach B.organize C.inspire D.comfort 7.A.challenge B.management C.question D.load 8.A.tiredness B.disappointment C.loneliness D.relief 9.A.fault B.disability C.shortage D.willpower 10.A.devoted B.attended C.adapted D.stuck 11.A.accomplish B.attain C.find D.reduce 12.A.wearing B.brushing C.cutting D.losing 13.A.wentup B.wentahead C.wentaway D.wentby 14.A.situation B.position C.state D.emergency 15.A.researching B.majoring C.aiming D.choosing 16.A.cometrue B.undertake C.realize D.support 17.A.meaningful B.motivational C.significant D.strong 18.A.action B.behavior C.existence D.communication 19.A.telling B.recalling C.sharing D.writing 20.A.doctor B.speaker C.writer D.driver
Lostwalletswhichcontainapictureofababyaremorelikelytobereturnedtotheirownersscientistshavediscovered. Researchersleft240walletsonthestreetsofEdinburghlastyeartoseehowmanywerereturnedtotheirowners.Someofthewalletscontainedoneoffourphotographs﹣ababyacutelittledogafamilyandaportraitofanelderlycouple.Otherwalletscontainedacardsuggestingtheownerhadrecentlymadeacharitydonationwhileacontrolsample对照组containednothingatall. ProfessorRichardWisemanapsychologistwhowasinchargeoftheexperimentsaid42percentofthewalletswerepostedbackintotal.Thosecontainingthepictureoftheinfantorthebabyweremostlikelytobringaboutanhonestreactionfromthefinderwith88percentbeingreturnedfollowedbythosecontainingpicturesofthelittledogat53percent.Ofthosefeaturingthefamilysnapshot48percentweresenttothereturnaddressandonly28percentofthosewiththepictureoftheelderlycouple.Walletscontainingthecharitycardsandthecontrolsamplewereleastlikelytobereturnedwithratesof20and15percent. ProfWisemanoftheUniversityofHertfordshiresaidThebabykickedoffacaringfeelinginpeoplewhichisnotsurprisingfromanevolutionaryperspective角度.Wewereamazedbythehighpercentageofwalletsthatcameback. Thewalletswereplantedatrandomaboutaquarterofamileapart.Snapshotswereinsertedintoaclearplasticwindowinsidethewalletsnoneofwhichcontainedmoney. 1.What'sthemainideaofthepassage? A.Researchersleft240walletsonthestreetsofEdinburghlastyear. B.ProfessorRichardWisemancarriedoutanexperimentwith240wallets. C.Lostwalletscontainingapictureofababyaremorelikelytobereturned. D.Walletswithcontainnothingaremostlyreturnedtotheirowners. 2.Thepassageismadebelievableby. A.tellingstories B.usingfigures C.askingquestions D.givingexamples 3.TheunderlinedphrasekickedoffinParagraph4mostprobablymeans. A.caused B.showed C.avoided D.accepted 4.Itcanbeinferredthat. A.peoplewhoreturnedthewalletsareinterestedinpsychology B.dogsaremorerespectedinwesterncountriesthantheelderly C.ProfessorWisemanhadexpectedtheresultbeforetheexperiment D.theresultoftheexperimentcanbedifferentifwalletscontainmoney
Therearevariousaspectsthatgointomakingasuccessfulschoolandsuccesscanbemeasuredinvariousways.Oftentheteachersarepraisedforaschool'ssuccessandblamedforitsfailure.Yetinorderforaschooltobeeffectiveitmustbeaplacewhereteachingandlearningcaneasilytakeplaceandthatrequiresthehardworkofmorethanjusteducators.Studentsmusttakelearningintotheirownhandsandfeelasifwhattheyaredoingisasimportantasitactuallyis.Thiscanonlybedonewiththecooperationofeveryadultthatisinvolvedinthestudents'life.Someoftheseindividualsoftengounnoticedyettheroletheyplayinthestudents'livesisimmeasurable. Intheschooladministrativeassistantsgreetstudentsatthestartofthedayandansweralargequantityofquestions.Whenanassistantremembersastudent'snameorevensomethingspecialaboutthatstudentitcommunicatestohimthatheiscaredfor.Theassistantcanalsogivethatextraencouragementforastudenttomakebetterchoicesespeciallywhentheyarevisitingtheprincipal'soffice. Meanwhilethoughcafeteriaworkershaveashortspaceoftimetointeractwithstudentstheycanmakeabigdifferenceaswell.Beyondmeetingnutritionalneedscafeteriaworkersmayalsoonoccasionmeettheemotionalneedsofthestudentstheyserve.Studentsbenefitfrompositiveinteractionwithadultsandcafeteriaworkersmaygivethatextrabitofencouragementthatachildneeds. Custodians管理员areusuallyunderappreciatedforwhattheyoffertoschools.Theyhavetobeknowledgeableabouteverythingfromcleaningtofixingthemostintricate复杂的tools.Theygettoschoolearlyinthemorningbeforeteachersarriveandlockuplateatnightafterthelaststudenthasleftfromtheafter﹣schoolevent.Theyalsomakesureteachersareequippedwiththenecessaryitemsandpreparetheroomssothattheyarereadyforlearning.Agreatcustodianalsogivesthatkindwordorextrasmiletothatstudentwhoneedsitmost. 1.Thepurposeofthepassageisto. A.emphasizetheroleteachersplayinaschool B.highlightthecontributionsofotherstaffatschoolbesidesteachers. C.telluswhomakethegreatestcontributionstoaschool D.explainwhatcontributestothesuccessofastudent 2.Ifanassistantremembersastudent'snamethestudentwillfeelthat. A.heispaidparticularattentionto B.heisspecial C.hehasdonesomethingwrong D.hehasmadeprogressinstudy 3.WhichofthefollowingisTRUEaboutcafeteriaworkers? A.It'senoughforthemtocookforthestudents. B.It'shardforthemtointeractwiththestudents. C.Theyhavethemostinteractionwithstudentsatschool. D.Theycanalsomeettheemotionalneedsofthestudents. 4.Howdoestheauthorfeelaboutthestaffmentionedinthetext? A.Disappointed. B.Dissatisfied. C.Appreciative. D.Doubtful.
﹣﹣﹣Youwantcreamandsugarinyourcoffee? ﹣﹣﹣ A.Asyoulike B.Yesplease C.Pleasedo D.Yeswithpleasure
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