2021-2022高考(XN英语周报)答案

第一节One possible versionDear Ms JenkinsI'm writing to ask you for help. Our school is going to sponsor an exhibition of Chinese paintings in theschool library next month. As president of the student council, i have been assigned the job of drafting an arnouncement in English as there aredreds of international students in our schoohave already written a rough draft of the above-mentioned announcement. But I'm afraid that there aresome mistakes in the English language. So I am hoping you would correct my possible mistakes in the announce-ment that i have attachedId appreciate it if you could do me the favocerely yourLIH

11.(实验班)解析:物体在斜面上运动时受到重力、拉力、摩擦力和攴持力作用,根据牛顿第二定律a=得50m/s2,由x=at2得,物体在2s内的位移为x=×5×22m=10.0m,重力做功WG=- Ing xsin37°=-2×10×10×0.6J=-120J,选项Δ正确;拉力做的功为w=ⅸx=30×10J=300J,选项C错误;摩擦力做功为WFf=-fx=-μ ncos37°x=-0.5×2×10×0.8×10J=-80J,选项B正确;支持力做功WN= FNXcOS90°=0,合外力做的功w=wF WN wG wFr=300J-120J-80J=100J,选项D正确。答案:ABD

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