2018-2022 英语周报 高三 新目标 7答案

书面表达One posssible versionDear Mr. Smith,I'm Li Hua, a senior 3 student. Learning that your City Culture department is looking for an English editorthis summer, I'm eager to apply for the position.As far as I'm concerned, city culture refers to a citys history, geography, customs, future, and so on. Asa native, I am quite familiar with our citys traditional culture. Besides, I have a good command of ErI' m especially good at English writing. Additionally, Im cooperative and creative, which will give me anadvantage for the position.I'll be greatly honored if I' m chosen for the job. If I'm admitted, please email me at lihua @16com.Yours sincerely,Li Hu

传送带的电机因传送物块额外消耗的电能最少,所以有W=12mx+Q(1分)解得Wm=2(2-√2)mgs(1分)15【解析】(1)传送带静止时由能量守恒定律可知E=Amgs(1分)物块在传送带上时传送带一直对物块做正功,则物块一直处于加速状态,设物块到传送带左端时速度为根据功能关系有pmg=2mt2-E,(1分)解得v=2即传送带的速度至少为2√pgs(1分)(2)设物块滑上传送带时的初速度为w,则2m=E(1分)解得v=√2gpA5物块在传送带上运动的加速度a=gH(1分)在传送带上运动的时间=V=(2-(1分)物块与传送带间产生的热量为Q=pmg(vt-s)(1分)传送带速度取最小值功=v(1分)

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