英语周报七年级下学期2022-2022答案

16.C【解析】稳定后,质点绕轴做匀速圆周运动,自身重力和悬线拉力的合力即悬线拉力在水平方向的分力提供向心力,故B错误;角速度一定,根据几何关系可得圆周运动半径R=x+Lsin6,重力和绳子拉力的合力,即 mg tan=m(+Lsin6)a2,两边约去质量,即日与重力大小无关,故A错误;角速度√7+Lsin,故C正确;质点从静止到做匀速圆周运动的过gtan B程中,有重力和绳子拉力做功,根据动能定理,绳子对质点做的功等于质点增加的动能和质点增加的重力势能,故D错误。17.『解却】Cw

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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