问题
选择题
如图，在竖直向下的匀强磁场中，将一水平放置的金属棒水平抛出，在整个过程中不计空气阻力，则金属棒在空中飞行过程中产生的感应电动势大小
A．逐渐增大
B．逐渐减小
C．保持不变
D．无法判断。
答案
答案：C
金属棒水平切割磁感线，竖直速度不切割，所以
，所以选C。
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如图，在竖直向下的匀强磁场中，将一水平放置的金属棒水平抛出，在整个过程中不计空气阻力，则金属棒在空中飞行过程中产生的感应电动势大小
A．逐渐增大
B．逐渐减小
C．保持不变
D．无法判断。
答案：C
金属棒水平切割磁感线，竖直速度不切割，所以，所以选C。
A man was looking for things of the old times. One day he came to a village and found a blue bowl which looked very _1_. The bowl was on the ground and a cat was drinking milk from it. A farmer, the _2_ of the cat, was lying_3_ the bowl. The man did not want the farmer to know that he was interested in the_4_. So he said to him, “What a nice cat you have! Will you _5_ it to me?” The farmer asked, “_6_ will you give me for the cat?” “Twenty dollars. Would that be enough?” The farmer thought for a few minutes, then he _7_. After he paid the farmer, the man said, “My cat will certainly feel _8_. May I take the bowl _9_the cat can drink with it?” But the farmer said, “I’m _10_ I can’t give you the bowl. Thanks to the bowl, I have sold twenty cats already.”
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