2021-2022 英语周报 高一 外研 35答案

第四部分写作第一节Last week our school held the Sports Week. We hade: lots of activities, such as running, hiking, and many kindsof ball games. We even had an exciting two-day sportsmeeting.Nowadays students are busy with their studies anddont get much exercise. This really worries our schoolauthority. So our school started the Sports WeekThe Sports Week proves to be a great success. It notonly builds up our bodies, but trains our characters aswell. Without health, there is no real happiness in life. Weshould work out regularly to keep fit.

所以;L-φ-φ-4V,根据匀强电场的特点,结合OC是直径可知Uw=Ux=4V,所以:φ:=φ+U=4V,粒子由A→B,根据动能定理得:WAmn一E=4cV,所以:m=W-4c=4V,所以:9”=0,则U=9:-w=8V,tm=n-=4V,故选项A错误,B正确,由于o=0,所以()与B是等势点,连接OB.则OB为匀强电场的等势面,过A点作(B的垂线交(B于D点,则AD的方向就是电均的电场强度方向,如图所示。(点是四心,由几何关系可知∠ABO=∠BAC=63.5°,所以:∠AOB=180°-∠AB0-∠BAC=53°,所以:1=Rin53004m,由于ODB是等势面,所以:E=,=4Vm=100Vm,故C错误,=4V0.04所以粒子在A点的电势能:E1(=c=4eV,粒子的总能量:E=E+E1=12eV,MERsin53°4解得最高电势φ·5V·最大电势能Em=5cV,因总能量E·12cV,所以动能E=7cV,故选项D正确答案:BD

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