题目

如图甲所示，一个质量m＝0.1 kg的正方形金属框总电阻R＝0.5 Ω，金属框放在表面绝缘且光滑的斜面顶端(金属框上边与AA′重合)，自静止开始沿斜面下滑，下滑过程中穿过一段边界与斜面底边BB′平行、宽度为d的匀强磁场后滑至斜面底端(金属框下边与BB′重合)，设金属框在下滑过程中的速度为v，与此对应的位移为s，那么v2—s图象（记录了线框运动全部过程）如图乙所示，已知匀强磁场方向垂直斜面向上。试问：（g取10m/s2） （1）根据v2-s图象所提供的根据汉语提示完成句子。1. There are many_______(楼房)in my hometown.2. The old man have lived_______(单独的)for several years.3. I have an important_______(面试)this afternoon.4. Don't forget to_______(归还)the book, or you will be fined.5. This is a wonderful writing_______(把……除外)several spelling mistakes.6._______(预测) the weather was difficult ten years ago.7. In the future, humans will have_______(更少的)work to do because of the advanced (先进的) robots.8. In China, many tired children don't go to bed_______(直到)11 pm in the late night.9. To our_______(惊奇),Jack didn't come to school again.10._______(当……之时)the alien was buying a souvenir in the store, the girl called the police.