2022英语周报高一课标答案解析

第二节Dear WangmingHow are you recently? I am sorry that I haven't written to you so long, ow my familycoronavirus hasntare very up. You must knowthe novbeen controlled effectivelysince it broke out in the US and so many people are being infected every day. So we dare notgo out because ofYou are lucky. When the novel coronavirus broke out in China, thegovernment took strong and effective measures and controlled its spread. There have been nolocal cases of infected people since September. China is great! Chinese people are lucky! Ireally regret coming here sometimes. I hope that I can return to our motherland as soon aspossibleFinally may you make great progress!LiHua.

【解析]1)根据题意,图甲所示实验方案中钝武和法码的总重力充当小车的合外力,为小托盘和砝码质量对实脸的影响,应满足M>m,而图乙所示礼实验原理为,挂上托盘和砝码,调整垫块位置,使质量为M的小车拖着纸带沿木板匀速下滑时由平衡备m0-M0b-7=0,丁=mg取下托盘和砝码,让小不板加速下滑,则有 Mosin- y Moos A=Mn由上几式解得F=T=mg=Ma所以不需要满足M>》m,则实验时需要满足条件M》m的实验方案是卩(2)用乙实验方案,在作a一F关系时,小车受到的合外力F=mg3)由丙图利用平均速度等于中间时刻的瞬时速度可得=51881m=030m利用逐差法可得小车的加速度为)×10-2s2=0.80m/s2

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