2022学英语周报高一课标基础答案

13.(1)4.713(4.712~4714均可)(2分)(212h=,(4/)(2分)(3)见解析(2分)【解析】本题考查验证机械能守恒定律和测重力加速度实验。(1)小球直径为d=4.5mm+21.3×0.01mm=4.713mm;(2)小球通过光电门的速度为t=d,由机械能守恒定律得mgh=2,整理得2h△t(3)由2mhsd整理得h(△t)g(△1)2:多次从不同高度h由静止释放小球,画出h与的关系图像,从图像得到图线的斜(△)率为k,则当地的重力加速度为d【关键点拨】处理创新实验问题的关键是弄清实验原理,本题的原理为mgh=1m

[ESE I When I was about to say goodbye. the girl asked if I'd had lunch. I told her I hadnt had lunch because I'd been waiting here for help for nearly three hours. The girl said they didnt have lunch either She suggested to herparents that we have lunch together Their truck happened to have some food and some things for the picnic. So weate together in a vacant lot by the side of the road During that time, I told about what had happened to me and howI felt. They shared interesting stories about their lives in Mexico and on fruit farms. After lunch, the girl's motherput a paper bag of fruit in my jeep. I showed my gratitude again and we said goodbye to each otherAfter they left, I got into my jeep and opened the paper bag. There are some delicate fruits in the paper bagwas surprised to find the money i had quietly left them At the same time, there was a note written by a girl, whichead "We are very happy to be able to help you. We have encountered many difficulties and been disappointed. Butwe met a lot of helpful people, which made us feel very warm. To help others with one's own ability is also a kindof lifting a finger. The beauty of life comes from these lifting a finger. I hope you have a good life and a happymood. "This made me very moved, and i would try my best to help more people in the future to make our worldmore beautiful and warmer

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