资源描述：
《黑龙江省大庆市喇中材料——初中物理2015各地亮题(46)——大气压强》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、初中物理2015各地亮题（46）——大气压强1、在日常生活中，为了提高烹煮食物的温度，缩短烹煮时间，人们利用水的沸点随气压的升高而升高的性质制造出了高压锅，某种规格的高压锅出气口的直径为3.2mm，计算出它的面积约为8mm2。要使锅内的气压达到2个标准大气压，请你帮助计算该高压锅应配的限压阀的质量为多少g？（设外界气压为标准大气压，标准大气压取105Pa，g取10N/kg）答案80g设出气口的面积为S，外界大气压为p0，锅内气压为p，限压阀质量为m,由pS=p0S+mg,得2、（1）把注射器的活塞推至注射器筒的底端，然后用三个橡皮帽封住注射器的
2、小孔；（2）如图所示，用细尼龙绳拴住注射器活塞的颈部，使绳的另一端与固定在墙上的弹簧测力计的挂钩相连，然后水平向右慢慢地拉动注射器筒。当注射器中的活塞刚开始移动时，记下弹簧测力计的示数F；（3）观察并记录注射器筒上所标明的容积V，用刻度尺测出注射器的全部刻度长度L。则大气压的大小为_____________________________________。答案此题为简单测量大气压强的实验。当注射器中的活塞刚开始移动时，测力计对注射器活塞的拉力与活塞受到的大气压力平衡，大小相等；注射器筒的横截面积是则大气压强international,Unico
3、minternationalmarket,adaptedfuturepeopleoncityofdevelopmentneeds,basedYuindustrysupport,andtrafficadvantage,andYangtzeRiverculture,andecologicalcivilization,advantage,establishedcitydevelopmenttarget:radiationabsorbYangtzeRiverupstreamchuanYunnanGuizhouofregionalcenter,andin
4、ternationalecologicallandscapeculturecity.2.3.2economicdevelopmentinYibincity,goal2020GDPreached300billionyuan,thepercapitaGDPreached580002030regionalGDPreached800billionyuan,thepercapitaGDPreached138000.2020industrialstructureadjustmentinYibincityas9:56:35;2030industrialstr
5、uctureadjustmentforthe6:47:47.Industrialoutputby2020of510billionyuanin2030andreach1.2trillionyuan.2.4oftheurbanpopulationandlandsize2.4.1Yibincity,populationsizeaccordingtothedifferentforecastingmethodsandthesizeofpopulationenvironmentalcapacitycheck,thedowntownmainfuturepop
6、ulationprojectionsfortheyearareasfollows:downtownmainfuturepopulationprojectionsfortheyear(unit:million)forecastmethods,2020,2030,balancingmethodfor130-150table2.4-1170-190ultrahighspeeddevelopmentofrelationshipbetweeneconomicandlabourlawdevelopmentof150210140180Generaldevel
7、op1301.7millionpeople,resourcesandenvironmentcapacitychecklandpopulationcarryingcapacity--280waterresourcesandpopulationcapacity-doesnotconstituteabindingcomprehensivepredictionofecologicalresourcescoupled--310resultsof140-180in2020,theactualresidentpopulationofabout1.4milli
8、onpeople;2030theactualresidentpopulationofabout1.8millionpeople.2.4.2theuse
