2022英语周报牛津HNX答案

9AC【綁析】当弹簧固定时,弹簧压缩量最势能最大,物体A的动能转化为弹簧的弹性劳能,根据机械能守恒定律得弹簧被压缩过程中最大的弹性势能等于物体A的初动能,设物体A的质量为mA,即有E=2m,当弹簧一端连接另一质量为2m的物体B时,物体A与弹簧相互作用的过程中物体B将向右运动物体A、B速度相等时,弹簧的弹性势能最大,选取物体A的初速度方向为正方向,由动量守恒定律得mA·2t=(2m+mA)v,由机械能守恒定律得Em=2mA(2)2-2(m+2m)y2,联立解得mA=6m,E=3mn2,故A、C项正确,B、D项错误

Paragraph 1On Monday morning, hiding behind the window, wesoon saw what we were waiting for. It turned out that there They were too funny as they hopped away holding theirwere three of them from our school. They sneaked up on injured feet. We just couldn't contain our happiness andour snowman and sneered. Taking their places on either i excitement. With a hearty laugh, we came out of hidingside, they pulled back their legs to deliver powerful kicks. and sprang into the yard from inside the house. " An eye forBut the moment they hit the hard ice block of the base,. an eye! Justice done! "We yelled behind them. And thatsneers turned into shock, then agony and tears. They was the end of our problems with the snow bullies. Everhowled and cursed, gritting their teeth and stomping their i since then, our snowman was kept guarded and intact untilhappily melted into spring water and finally wove into ourParagraph 2sweetest childhood memoriesSeeing their pained looks, we couldn t help laughing

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