2022 英语周报 高一 GDY 3答案

was then promoted as taskmaster. After he had earned enough money, he became a bosseventually.After hearing his words, the boy thought a lot. Success can only be born in action. Workinghard is all winners shared and indispensable experience for achieving their dreams in their lives.Actually the contractors experience was just one good example to prove the truth of it. The boyknew that if he wanted to stand out among people, there was no shortcut or alternative but hardwork. Then he thanked the contractor for his reply and said goodbye to him. Leaving theconstruction site of the skyscraper he already had a firm resolution in his mind that he would starthis own journey right then in order to fulfill his dream in time【参考范文】The contractor told the boy that was also how he had got where he was then. Actually thebuilding contractor had once worked hard and outperformed others through his own constantefforts. If he had worn the same shirt just like other workers and hadn t devoted himself toworking, by no means would he have been noticed by his boss. As a matter of fact he wore his redshirt every day and worked arduously. Soon his day came. He obtained his bosss appreciation and

13.(6分)(1)使细绳的拉力为小车做匀加速运动的合外力(1分)需要(1分)(2)2.0(2分)(3)偏小(2分)【解析】(1)本实验使用了拉力传感器,实验时需要适当拍高长木板的右端以平衡摩擦力,其目的是使细绳的拉力为小车做匀加速运动的外力中衡哪擦力时,小车需要连接纸带,因为小车连接纸带运动时带与打时器之间也存在阻力。(2)每相邻的两计数点间都有四个点未画出,困此计数点之间的时间间隔为7=0.1s,根据△=ar,代入数后解合10.61+8.61-6.59-4.61×10-m/s2=2.0m/s2。47.4×0.12(3)观察题图丙可知,当细绳上的拉力达到一定值时,小车才有加速度,这说明平衡摩擦力不足,长木板的倾角偏小。

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