2020－2022英语周报高二课标综合OT第2期答案

11答客(1)11.30(2分)(2)f t(2分)(3)可靠(2分)解题思路1)小球的直径为d=11mm 6×0.05mm=1.30mm(2)小球下落过程若满足机械能守恒,则有mgh=-mn-m;,dd,联立可得2ght7 1(3)由于小球释放后,它的球心不一定正好绝对无误地通过光电门的挡光部位,会造成挡光的距离偏短,测量的速度会偏大,从而造成实验数据偏差。而换用正方体的铁块,即使计时释放点略有偏离光电门的中心,挡光的距离仍为正方体的棱长,故相比小球,采集的实验数据会更加可靠。

第一节【参考范文】Dear annieIm Li Hua. Hows everything going these days? I'd like to ask you to write an article for our schools English newspaperThe"Culture field "section is very popular among us students. And here are some relevant details about the articles we areeager for. Would you please write something about how Americans spend their holidays and festivals, which is interesting andinformative? 400 words would be fine. Could we have your article before June 10?I'm looking forward to your replySincerely yoursLi Hua

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