2022年高考英语模拟试题三英语周报答案

【参考范文】One day, Spotty returned from his daily walk with a broken leg. Appearing exhausted, he came to myroom and sat near me, the leg bleeding. I called my mother and she quickly tied a bandage around his leg andgave him food to eat. I was very upset. But the next day, Spotty followed me wherever I went happily asusual though he limped a bit. After this incident my relation with Spotty became more intense. I reallyadmired him a lot for his courageAlmost a year later, one midnight we heard Spotty barking breathlessly. We rushed out and saw himbarking continuously, heading somewhere. After some time Spotty became quiet. I patted him on his backand came inside. The next morning, my heart skipped a beat when I didn't see Spotty. I searched for him ineach and every corner but in vain. And this time he had gone and would never come back. I cried and waitedfor him. But there were no signs of him and I only say him looking at me with his sparking eyes in my dream

15【解析】(1)金属棒P1在区域ABCD的磁场中运动时产生的电动势为E=BLv(1分)代入数据解得E=0.6V(1分)回路中的感应电流为I=E(1分)解得I=1A(1分)由辛衡条件得F1=2 mosin+BIL(1分)F1=1.3N(1分)(2)当金属棒P1、P2均在磁场中运动时,拉力F的功率最大,拉力为F2=2 nisin升+4BI(1分)解得F2=2.2N(1分)拉力F的最大功率为P=F2v分)解得P=4.4W(1分)

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