题目

如图是某监测系统每隔2.5 s拍摄的关于卫星发射起始加速阶段火箭的一组照片，已知火箭的长度为40 m．现在用刻度尺测量照片上的位置关系，结果如图所示，请你估算火箭的加速度a.   答案：[解析] 由火箭长度为40 m可知，刻度尺的1 cm相当于实际长度20 m．量出前后两段位移分别为4.00 cm和6.50 cm，对应的实际位移分别为80 m和130 m，由Δx＝aT2可得 130 m－80m＝a×(2.5 s)2，即a＝8 m/s2 [答案] a＝8 m/s2阅读短文，回答问题。Dear Liu Yun,       I'm happy to have a new pen pal. I live in Australia. I like swimming, diving, and riding my bike. My twin sister Ann likes drawing pictures and making kites. I like sports, but she likes art. We look the same, but we don't like the same things. Tell me something about you: What's your hobby? 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Your new pen pal, 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Alice 1. What is Alice's hobby? ___________________________________________________________2. What is her twin sister's hobby? ___________________________________________________________3. Does Alice live in China? ___________________________________________________________4. Does Alice's sister like art? ___________________________________________________________5. Where does Alice's sister live? ___________________________________________________________