题目

为了探究物体质量一定时加速度与力的关系，A、B同学设计了如图甲所示的实验装置．其中小车的质量为M，砂和砂桶的质量为m，与小车相连的滑轮的质量为m0 ． 力传感器可测出轻绳中的拉力大小，重力加速度为g．实验时先平衡摩擦力． （1） A同学在实验中得到如图乙所示的一条纸带（相邻两计数点间还有四个点没有画出），已知打点计时器采用的是频率为50Hz的交流电，根据纸带可求出小车的加速度大小为 m/s2（结果保留三位有效数字）． My interest in cooking started when I was 11, partly thanks to my mother. She didn’t really like cooking and when she did cook,I didn’t like her food. Once I was watching something about cooking on TV and I thought I could do this, so I went to the bookstore and looked for the biggest cookbook I could find .During a year, I had made most of its recipes(食谱 ) and was ready for a bigger challenger（挑战）.I wanted to create my own dishes and I started cooking for more people than just my family. To my happiness, my parents allowed me to build a test kitchen. I did much cooking test my dishes in it and my skill became better and better. Now as a teen chef(主厨). I have cooked in top-class restaurants around the country. I am not doing it for money, but because I love cooking .Now I know that when you stop caring whether you will be famous or do well, your happiness will come to youJudge the following statements True (T)or False(F)【1】The writer liked his mother’s food when he was a child【2】The writer's parents allowed him to build a test Kitchen【3】The writer’s mother taught him how to cook.【4】Now the writer is a famous chef around the word.【5】The writer is not cooking for money