2022 英语周报 八年级 WHE答案

14【解析】(1)粒子在磁场中做匀速圆周运动,运动轨迹如图所示,设轨迹半径为n∷∷∷∷:x∴:x氵∴:只∷D·22由洛伦兹力充当向心力可知qB=m,解得n=(2分)粒子在國外正方形磁场中的轨迹半径也为n=R粒子恰好不射出正方形区域,则正方形的边长L=2r1+2r=4R(2分(2)粒子在國形磁场中做圆周运动的周期T:=3,在圆形磁扬中运动时间4=2(2分粒子在國形以外的区域做圆周运动的周期T=2,在圆形以外的磁场中运动时间2=≥T2=3TR(2分)则再次回到M点的时间t=41+h=E(2分)

Dear Sir/MadamI'm planning to travel to the USA in the coming JulyTherefore, I'm writing to inquire about travel routesof your agency.【要点一,发出请求ntend to stay in America for about 10 days, durig which I hope to have a look at some unique naturalscenery and have a taste of local customs【高分句型hich引导定语从句】.So, could you please recommend some suitable travel routes? In addition . Id like to know the prices of the routes, covering all the traveling expenses【高分句型二,现在分词 covering作状语】.【要点二,告知相关信息】A reply at your earliest convenience is highly apprecYours,Li Hua

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