2021-2022 英语周报 高一 HNN 5答案

8BD【解析】在Wx图像中,斜率表示力,由W1=F1x,对应题图乙可知,物体与地面之间的滑动摩擦力F2N,由F=mmg,可得p=0.2,A错误;物体的最大位移xn=p=135m,B正确:由Wn=Fr,对应题图乙可知,前3m内,拉力F1=5N.3~9m内拉力F22N物体在前3m内的加速度a1=F1-Fy3m/s2根据运动学公式x24t2,可得t=√s,C错误;由动能定理得W;-F1x=-mv2,可得x=9m时,物体的速度为v=32m/s,D正确。故选BD。

One possible versionThe Most Beautiful Place in My HeartAs a 17-year-ol teenager, I ve been to many great cities, among which Luoyang is the most beautiful one inlocated on the north bank of the luo river in western Henan pruvinee l aovany is surrounded by mountains on threesidles, high in the west and low in the east. At the end of 2019, Luoyang had a population of more than 7. I millionI love Luoyang so much due to the fact that as one of the four ancient capitals of China, Luoyang has a civilizationhistory of 5, 000 years. Whats more, the number of its heritage sites is second only to Beijing in cities of China. And itfamous tourist attractions inelude Lungmen Grottoes, Baima Temple, Guanlin and so on

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