2022英语周报七年级外研版第二期答案

22.(1)2.4(2)0.580.593)摩擦阻力造成的机械能损失(4)9.7解析:(1)v=(21.60+26.40)×10-m/s=2.4m/s2×0.1(2)△E=2(m+m2)v2=0.58J,△Ep=(m2-m)gh=0.59J。(3)由于存在摩擦阻力,重力势能有一部分转化为内能。(4)由2(m+m)13=(m一m)g得2=是h故斜率k=.2一2,得8~9.7m

短文改错This evening my father was at a grocery store, where is often crowded. A woman next to with him hadwhiclocked her keys and her baby in her vehicle. Several store clerks had tried to help her but in vain, and he did notshehave the money for a tow truck(E4). My father called a friend of his who is the tow truck driver. It wasalate in the evening and he were having dinner with his family. Therefore, he immediately agreed a drive to helpwasHowevertothe woman. My father then gave the driver twenty dollars and all ended good. The woman was quite moving andwemovednearly burst into teartears

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