第一节One possible versionMy Favorite AthleteMy favorite athlete is Lin Dan, who is better known as "Super Dan". He is considered to be one of the most outstandingbadminton players in the world. When he was young, he showed a strong interest in playing badminton. Then, he made great effortsto play badminton and was admitted to the national team eventually.But what impresses me most is his wonderful performance in 2012 London Olympics, when he competed with another excellentplayer. With his skills and strong will, he overcame all the difficulties and finally won the competition, becoming the world champion.Super Dan is always an inspiration for me.

24.(12分)解:(1)线框先做自由落体运动,后做匀速直线运动,设线框匀速运动的速度为v,线框自由下落的时间为t1则有t1==(1分)线框匀速下落的时间为t2,则有t2=-(1分依题意有t=t1+t2联立以上三式解得=+,代入数据解得v=0.2m/s或v2=0.8m/(2分)(2)线框在经过MN过程中做匀速直线运动,受力平衡,则有=mg(1分)线框的上下边都在切割磁感线,则产生电动势为E=E1+E2=2E=2B/v(2分)上下两边都受到安培力作用,则有F安=F1+F2=2BI(2分)根据欧姆定律有R(1分)联立以上各式解得B=Mgrg代入数据解得B1=31.25T或B2=15.625T(2分)

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