孙杨和菲尔普斯谁游泳游得快?

Sun Yang became a household name across China after his stunning victories at the 2012 London Olympics. At the 2013 World Aquatics Championships, Sun Yang impressive medal haul of three gold and one bronze saw him cement his name as one of the greatest long distance swimmers in history. What made his brilliant performance all the more impressive was the rough year he's had in training in the wake of his London glory, as well as recent disputes with his coach.
On the first day of competition, Sun Yang won gold in the 400m freestyle and the next day, retained his world title in the 800m freestyle, winning China's 100th gold medal in the World Aquatics Championships history.Sun Yang capped off his World Championships with a third gold in the 1500m.
However, my deepest impression of Sun Yang was when he cried during his interview after winning his first gold medal. Behind those tears were the strong determination, hard work and mountainous pressure that Sun Yang had to cope with over the past year, and his achievements have indeed made everyone proud.
楼主你好,这是我自己写的文章,你看看如何.希望对你有帮助!
有问题可以追问哦!谢谢!
祝学习进步!

解题思路：（1）根据v=[s/t]求出速度；
（2）物体的运动和静止是相对的，相对于参照物来说物体的位置发生变化则是运动的，否则是静止的；
（3）孙杨在水中处于漂浮状态，浮力等于重力．

（1）孙杨游泳的时间t=3min42s=222s，
他全程的平均速度：
v=[s/t]=[400m/222s]≈1.8m/s；
（2）我们选取看台上的观众为参照物时，孙杨相对于观众来说，位置发生变化，所以我们说他是运动的；
（3）孙杨的重力：G=mg=89kg×10N/kg=890N，
孙杨在水中处于漂浮状态，浮力等于重力，所以他浮在水中时所受浮力F_浮=G=890N．
故答案为：1.8 m/s；看台上的观众；890．

点评：
本题考点： 变速运动与平均速度；参照物及其选择；浮力大小的计算．

考点点评： 此题主要考查的是学生对速度、重力计算公式的理解和掌握，同时考查了运动和静止相对性的理解和掌握，基础性题目．

swimming faster than othe

2012年7月29日.伦敦奥运会400米自由泳决赛中,孙杨打破世界记录并力压卫冕冠 军朴素而为中国代表团夺取一枚金牌,一下是关于孙杨在比赛中的一些说法,其中正确的是.A.孙杨在比赛过程中所受浮力始终等于重力.B孙杨在起跳入水过程中,所受浮力是增大的的.C孙杨在游泳池中所受浮力方向与其划水方向保持一致.D孙杨所受的浮力大小与游泳池中水的密度无关
答案：B

A

解题思路：此题是一道基础知识题，具体考查的是视觉形成的过程．视觉形成的过程是：物体反射的光线，经角膜、瞳孔，经过经过晶状体、玻璃体投影在视网膜上，刺激视网膜上的感光细胞形成神经冲动，神经冲动沿着视神经传到大脑皮层形成视觉．视觉形成的正确顺序是：物体反射的光线→角膜→瞳孔→晶状体→玻璃体→视网膜→视神经．

通过分析知道视觉形成的正确顺序是：物体反射的光线→角膜→瞳孔→晶状体→玻璃体→视网膜→视神经．所以我们观看比赛时，在大脑内形成视觉的途径依次经过的结构是：物体反射的光线→角膜→…（①瞳孔②视网膜③晶状体④视神经⑤玻璃体）→视觉中枢→形成视觉．经过的正确结构顺序是：瞳孔→晶状体→玻璃体→视网膜→视神经，即①③⑤②④．
故选C．

点评：
本题考点： 眼球的结构和视觉的形成．

考点点评： 视觉形成是个非常重要的知识点．

泳坛新秀孙杨和叶诗文在伦敦奥运会上的精彩表现,激发了杭州人对体育的热情,人们开始参与并推广各类体育活动.

Yang SUN is swimming faster than others.

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Sunyang has won the championship in Olympic Games,establishing a world record.Thus I extremely adore him.

孙杨真是一位游泳健将呀!