2019 2022七年级英语周报答案

12.答案(1)3.60(1分2)物北吧)地面成挡光片)的高度B1分)(M=m)1=21(m ()2分)(3)(2分(2分)命题透析本题考查验证机械能守恒定律,考查考生的实验能力,考查科学探究。思路点拨(1)该游标卡尺为20分度,最小精确度为0.05mm,游标卡尺读数为3mm 12×0.05mm=3.60mm;(2)物块A刚要落地时的速度=,,设物块A下落的高度H,则(M-m)gH=(m M)t2,即(M-m)gh2(m M)(//,还需要测量的是重物A(或光电门)开始时离地面(或挡光片)的高度H(3)由(M-m)6∥=、1(m M)得到M2m mgh当此图线与纵轴的截距为,斜率为4m,则机械能守恒定律得到验证。

写作Dear TonyYou say you have dimeulty adap ting to the new study and life herelow exactly how you feel.(表示关心) You must be very anxious,butqui te normal since this is your first time to study in a foreig【高分句型-】 Just relax. First, break bearning goaIs into small stepsen get involved in school activities, wherou can make more friends.【高分句型二】(帮他分析原因Hopefully my sugsestions would be helpfum always the person youcan count on提供建议)s t

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