2022高二必修五第九期英语周报答案

24.(1)设a粒子每加速一次动能增加2rU.(1分)第n次被加速后a粒子的动能,2mV=2m以(2分),解得-2(分)粒子第1次加速后与第2021次加速后的速度大小之比-2m(2)a粒子在磁场中做匀速圆周运动,有2B=m(2分)当r=R时,a粒子的速度最大,动能最大所以最大速度u=2BR(1分)最大动能E-=2m=2BE(分a粒子做园周运动的周期T=5-(1分)设a粒子在电场中加速的次数为n,由动能定理得:n2U=mv(1分)a粒子在电场中每加速一次随即在磁场中运动半周,所以1=”z(1分)BR联立解得1s“2U(分)

书面表达One possible version:Last Saturday night, our school in Britain held a fantastic group birthday party for all foreign students inthe lecture hall, which left an unforgettable impression on usAll foreign students were free to take part in it. Some of our foreign friends were also invited. With thebaker's help, we made a huge birthday cake with delicious fruits and cream. Then some students danced, sangand shared funny jokes on the stage. Most impressively, a girl stood on the stage, with tears in her eyes, madea speech about our mother, the woman who gave birth to us with great pain, brought us to this beautiful worldand led us to enjoy love and learn knowlege. It is our mothers who are the greatest women in the world! Nowwe are far away from them, missing them. But we'll study hard and perform well to let them keep proud of us!What a moving birthday party it is!

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