试题与答案

如图所示,LMN是竖直平面内固定的光滑绝缘轨道,MN水平且足够长,LM下端与MN

题型:填空题

题目:

如图所示,LMN是竖直平面内固定的光滑绝缘轨道,MN水平且足够长,LM下端与MN相切.在虚线OP的左侧,有一竖直向下的匀强电场E1,在虚线OP的右侧,有一水平向右的匀强电场E2和垂直纸面向里的匀强磁场B.C、D是质量均为m的小物块(可视为质点),其中C所带的电荷量为+q,D不带电.现将物块D静止放置在水平轨道的MO段,将物块C从LM上某一位置由静止释放,物块C沿轨道下滑进入水平轨道,速度为v,然后与D相碰,粘合在一起继续向右运动.求:

(1)物块C从LM上释放时距水平轨道的高度h;

(2)物块C与D碰后瞬间的共同速度v

(3)物块C与D离开水平轨道时与OP的距离x.

答案:

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See what happens? We are going to get up in the air, and see what happens? At this point, one woman started crying. “Oh, no! We are going to       !” There were sighs of desperation and       spreading throughout the plane, and we hadn’t even        yet. Thirty minutes passed and we were still        there. Then the voice of the pilot came over again,“ Ladies and gentlemen, I know you are       , so we are. We only have one engine going right now, and it is working double time. ”
There was crying       we had walked into grave. But, the pilot told us our one engine was working double time, and his        was to get up in the air and see what happens! Then we did. We got up in the air and         happened. We arrived in Norfolk and everyone        for still being alive.
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