2023-2022英语周报七年级新目标47期答案,我们目前整理分享关于2023-2022英语周报七年级新目标47期答案及其参考答案,2如需答案 请关注微信公众号：趣找答案/直接访问www.qzda.com(趣找答案)
书面表达Onepossibleversion:NOTICEAsportsmeetingwillbeheldintheplaygroundofourschoolfromnextThursdaytoFridayAsyouknow,thepressureofstudyisveryheavynow,especiallyforthosesenior3.Sothepurposeofthesportsmeetingistoleteverystudentgetrelaxed,asaresultofwhichwestudentscanlivehappilyandhealthilyEveryoneiswelcometotakepartinit.Thosewhoperformexcellentlyatthesportsmeetingwillgetprizes.Butdon'ttaketheresultssoserouslybecausetakingpartismoreimportantthantheresult.Goodlucktoeveryone!
19.(14分)(1)第二象限电子类平抛,水平方向匀速306,解得=23L2分竖直方向匀加速L=1.cx2,解得E=3m2分注:用速度偏转角结果正确同样给分(2)轨迹如答图2所示,N点处,竖直分速度u=r=n1分合速度U=2U,与竖直方向夹角a=301分由几何关系,圆形磁场区域半径Ran60°=L1分轨道圆半径r=Rtan302分又由qUB=m1分解得B=23m1分eL(3)由几何关系,矩形磁场区域长度为yL1分宽度为r-rcos3L--l1分则最小面积S=L(L-L)1分注:图中第四象限仅为参考轨迹,圆心可以不在OO上,粒子出射点可以不在OO上,即轨迹整体可以向左平移VOIM
....
