高一课FJM标英语周报第14期答案

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

应用文写作( One possible versionDear FrankWe plan to participate in the weeklong labor practice in the school field base scheduled from August Ito 8. Im writing to invite you to Join usThe base offers free accommodations and various activities. Participants can learn to do outdoor worklike farming or gardening. The art of making tea, which interests you very much, is also taught. Whatattracts me most is that we'll learn to raise animals such as goats or rabbitsIn the practice, we can experience the value of labor and expose ourselves to a wide range of practicalskills, which will surely benefit usLooking forward to your replyYoursLiH

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