2022英语周报高一上答案

I looked at what the second man had dropped; it was jewellery. It all happened too quickly,but I soon realized what had happened. They were burglars. My friend Jeremy, who was waitingfor me, quickly ran out. when hearing unusual noises. We called the police and they were there 5minutes later. I gave the police officer descriptions of the thieves and told them the names theyhad called outYou were brave for trying stop them, "said the officer: We should be able to catch themwith your information. " Jeremy told the officer the owners of the house were on holiday and gavehim a phone number. When the officer left, I told Jeremy about the mistake with the doornumbers. I hadn, t really been brave at all, but my mix-up had stopped the burglars getting awaywith the jewelry. Jeremy's neighbor thanked me a lot when they came back. Actually I have been

9.【答菜导体棒切制磁感线产生感应电动势,由闭欧姆定律确定金属棒两端的最大电压;由安培力结合电荷量表达式解得金属棒受到安培力冲量大属棒下滑的最大速度干衙解得其速度解得金属棒产生的本题主要考查电磁感应现象与应用,熟悉电磁感应现象是解题的关键,难度金属棒相当于电源,两端电外电阻为零,因此U=0,A错误金属棒受到安培力:F=B,流过ab棒某一横截面的电荷量为g时,有:q=1,故可得安培力的冲量大小为:F=BLt=Bq,B项法拉第电磁感应定律、闭合电路欧定律可得解得金属棒沿导轨滑的距离为D金属棒下滑的最大速度时,其所受的合力为零,设金属棒下滑的最大速度为ν,由共点力的平衡mgsin8 BIL解得其最大速度为5B2,根据能量守恒,金属棒产生的焦耳热:Q= maxine-2m2=3m99m2k25BL50844,D正确故选B

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