第二节书面表达NoticeDear studentsIn order to carry forward China's time-honoredraditional culture and expand the international influence ofChinese culture. the Student Union of our school will holda Tang and Song Poetry Recitation Contest. All theexchange students who feel interested and have a passionfor Chinese culture are welcome to participate in thecontest. We will appreciate the beauty of Tang and Songpoetry and fecl the charm of Chinese literature togetherLet's recite poetry, taste classics and feel literature. Wewill be seeing each other in the school hall on May 5thThe Student ur

13(1)2.5m/s25.5m/s2(2)20m/s【解析】(1)用E1和I1分别表示abdc回路的感应电动势和感应电流的大小,根据法拉第电磁感应定律和欧姆定律分别得E1=BL(v2-)=15V(1分)E7.5由牛顿第二定律得I, BL-Ag=ma I(1分)Mg-F,=Ma(1分)11 BL-Amg=ma 2(1分)解得a1=2.5m/s2,a2=5.5m/(2分)(2)最终ab杆及cd杆的加速度相同,设其为a.速度差为△v,则E,=BL△v(1分)E1:=2(1分)设绳中的拉力为F2,由牛顿第二定律可知1: BL-umg=a(1分)Mg- F: Ma(1分)F2-I2BL-ymg=ma(1分)解得a=5m/s2,Av=20m/s(1分)

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