2022高二选修6英语周报答案

5.D【解析】由题可知,在电场变化过程中,小球始终处于平衡状态,小球所受的重力mg的大小、方向均不变,细线拉力T的方向不变,当电场力qE的方向由水平向右沿逆时针方向缓慢旋转到竖直向上的过程中,对小球根据平衡条件可画出如图所示的动态受力分析图,由图可知,当电场方向向下时,电场力竖直向上,此时电场力最大,等于重力mg,电场强度最大,A项错误;由几何关系可知,当电场方向沿水平方向和沿逆时针方向转过60°0角时,电场力的大小相等,都等于3mg,且不是最大,也不是最小,故电场强度不是最大,也不是最小,BC项错误;当电场方向转过30°角时,电场力方向垂直于细线拉力的方向,电场力最小,由几何关系可求得,电场力的最小值为qm2mg,解得Emn=3,D项正确。

第二节书面表达(满分25分)One Possible versionThank you for your attention to the activity themed "The Scientist 1 Admire Most", which wasorganized by the Students'Union of our school. I am more than willing to tell you about the eventI shared the story of Mr Yuan Longping, an agricultural scientist known as"Father of HybridRice". He developed the world's first successful hybrid rice varieties, which dramatically increasedrice production in China. His approach to rice breeding also serves as a solution to food problemsaround the globeThe scientists' stories shared by other participants truly inspired me, motivating me to trulylove science by making great contributions to it. Could you please tell me about your favorite

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