（济南一模）2022年高考模拟考试答案

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弟二节：书面表达（满分25分）One possible version:Use Our Time WiselyDear fellow students.Having been carried out for half a year.the "Double Reduction"Policy frees us to engage inmore after-school activities.We students are facing the challenge of making the best of our freetime.Here are some suggestions.First and foremost,we are supposed to take up some healthy and meaningful hobbies.Forinstance,doing regular physical exercise and learning to play an instrument are good choices.Inaddition,we can devote our spare time to housework and volunteer work as well,from which wecan gain some useful life skills.I firmly hold the belief that only if we manage to use our time wisely,can we enjoy a happierlife and grow into a better person.

5.解析:(1)粒子在电场中做类平抛运动,由动能定理得Ed=2my2-2m………(2分=2×103C/kg…………………………………(2分(2)设粒子从O点进入磁场时的速度方向与x轴的夹角为0,则(1分)解得6=45°,即粒子沿着OB方向进入磁场粒子进入磁场后做匀速圆周运动,磁感应强度为B1,半径为n由几何关系粒子轨迹对应的圆心角为120Rtanbo=(1分解得n=2m(1分)在磁场中由牛顿第二定律qvB1mU(2分)B1=T………………(2分)(3)粒子进入磁场后做匀速圆周运动,磁感应强度为B2,半径为r2,周期为T,依题意可知,与刚性圆环碰撞2次后回到O点时运动时间最短,依据轨迹的对称性和几何关系。tan30°=R(1分)tan 30=Rr2=5(1分由牛顿第二定律UBzn(2分)解得B2=12T(1分)粒子在磁场中圆周运动的周期T=22(1分)粒子在磁场中运动时间t=2T=√6x×10-3s(2分)