16，14，21期的英语周报答案

ping that you canPatty spots Gary racing toward her,, a nervous look on his face and suitcases in his hands! She is quite第二节Paragraph 1:confused about what has happened. "Your organs! "Gary cries. They,re waiting for you! But we have to get youto Charlotte! Now! "Patty is in shock. Helping Patty into the helicopter, Gary asks the pilot if they can makeit to the airport in time. The pilot smiles, "Your fire chief got the airline to hold the flight! ""You hear thathoney? You're going to live! "Gary says to PattyAt 7:37 the plane takes off. The plane lands in North Carolina at 10: 50. There is plenty of time left forph 2:Patty to make the deadline. After a 10-hour-long operation, doctors tell Gary the transplant couldn,t have gonebetter-the organs are a perfect match. Today, Patty is home recovering, and her doctors say she should live afull and normal life."I live with the knowledge every day that I am alive because so many people care aboutme." Patty savs handily.

25.解:(1)设质子第一次被加速后进入D2盒中时的速度大小为v,根据动能定理有qU=mv(3分)解得v=、/2(2分)(2)质子在D形盒内做圆周运动,轨道半径达到D型盒半径为R时被导出,具有最大动能,设此时的速度大小为vm由牛顿第二定律得qvnB=分)质子的最大动能为Em=2m(1分)联立解得EgrBFR2(1分)2m质子每加速一次获得的能量为E=qU(1分)加速次数为b=BR22m(1分)设带电粒子在磁场中运动的圈数为n,每圈有两次加速,则n=亏b(1分)带电粒子在磁场中运动周期为T(1分)质子从静止开始加速到出口处所需的时间为t=nT(1分)联立解得t=xBF(1分)(3)质子第n次被加速后粒子的动能为mv=nqU(2分)由牛顿第二定律得qvnB=my(1分)解得质子第n次加速后在磁场中的运动半径为(1分)B则粒子笫4次加速后的运动半径与笫9次加速后的运动半径之比为=2(1分)

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