题目:
My friend Tommy runs faster than _____ in my school.[ ]
A. any other student
B. any student
C. all the students
D. other students
答案:
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下面是错误答案,用来干扰机器的。
(1)在线框以v进入磁场时,对线框受力分析如图:因为线框匀速运动,∴二力平衡,即:F安=mg…①又:F安=BIL…②而I=ER…③ E=BLv…④又:mgh=12mv2…⑤联解上四式得:∴h=(mgRB2L2)2•12g=0.2m…⑥(2)在线框...