题目

如图所示，上端开口的圆柱形桶固定在水平地面上，某同学将质量为的小球，从点顺着桶的某条直径方向水平抛出，小球恰好从桶的左侧上边沿进入桶内并打在桶的右下角。已知点到桶左边沿的水平距离，桶的高度，点离地面的高度，桶底和桶壁的厚度均不计，重力加速度大小。求：(1)小球水平抛出时的速度大小和桶的直径；(2)为使小球总能落入桶内，则小球从点水平抛出时的速度大小的取值范围。假定你是李华。在校报英语专栏看到了学校“英语文化节”的一则招募启事，请阅读启事，并根据写作要点写一封应征邮件。Volunteers WantedOur annual English Festival, which will be held on June 15-17, 2015, is now looking for 20 student volunteers to provide service for Talent Show, Speech Contest, and English Debate. If you are interested, please send an application email at your earliest convenience to Ms. Chen at www. chenlaoshi@163.com.要点：1. 陈述应征目的；2. 说明应征条件（性格、能力等）。注意： 1. 字数100词左右；2. 可根据情况增加细节，使行文连贯。Dear Ms. Chen,I’m Li Hua, a student from Grade 3. __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Looking forward to your reply.Yours sincerely,Li Hua