刘翔跑110米栏 110米是位移还是路程?

Born in the 1980s,Liu Xiang is one of the best athletes in our country.He is good at running and 110 meters hurdles.He is even the most capable hurdler in the world.He keeps the best record of 12.88 seconds until now.No one has the ability to break it so far.Among lots of TV programmes,I like the sport games best.And the 110 hurdles races are the most exciting games in them.Everytime I see Liu Xiang running in the track,shouting wildly after the races,I find myself is full of passion in my heart.Especially,the moment when he gets the first prize on the stage,I can't help applauding for his excellent performance.I am deeply moved by his spirit and his great ambitions.The sports spirit of Liu Xiang also inspires me a lot in my life and study.As a young man,Liu Xiang is the best example of making every effort to develop his sport career and break so many records,though he has got many medals now.I think this spirit is worth to learned by all of us.With this ambition,we could defeat any difficulties in our lives and works.Affected by his restless soul,I will never give up and insist my ideals.As one of his fans,I hope that Liu Xiang could do well in the 2008 Beijing Olympic Games,and win more gold medals for our country.I support him forever in my heart.As for myself,I will work as hard as him to make more progress in my study.

Liu Xiang quits 110m hurdles
Liu Xiang's dream of defending his Olympic title on home soil ended on Monday when he failed to start his first-round heat in the 110 metres hurdles.
Liu,the world champion and the host nation's best hope of an athletics gold medal at the Beijing Olympics,pulled up after a false start and hobbled down the tunnel to leave the Bird's Nest stadium in stunned silence.
He was clearly out of sorts and grimaced in pain as he went down into the blocks.
After a false start,he stumbled forward for a few paces obviously hindered by the injury to his right leg before walking away and leaving a packed Bird's Nest stadium in stunned silence.
"Liu Xiang has two injuries,one to his Achilles and one in his leg.One of the injuries is an old injury," his tearful coach and mentor Sun Haiping told a news conference."
It's the end of the Achilles tendon in his right foot," he added."He will be back for sure."
The China athletics team's head coach Feng Shuyong said 25-year-old Liu had sustained the injury in training on Saturday.
"This morning he felt the pain intensify," he said."Even though he felt the pain he decided to compete in the first heat."
Liu would not withdraw unless the pain was intolerable and there was no other way out."

假设跑步速度为a,步行速度为b.2分24秒等于12/5分钟.则
可以得到方程：2b+10a=12/5b.
则a/b=25.即
跑步的速度是步行的速度的二十五倍.

选A. B项太夸张了,语意不符.C项为贬义词,不合适.D项用于形容年轻女性的.

火车速度：（1720-1020）÷（44-30）=50（米/秒）
火车长度：50x30-1020=480(米）

Liu Xiang quits 110m hurdles
Liu Xiang's dream of defending his Olympic title on home soil ended on Monday when he failed to start his first-round heat in the 110 metres hurdles.
Liu,the world champion and the host nation's best hope of an athletics gold medal at the Beijing Olympics,pulled up after a false start and hobbled down the tunnel to leave the Bird's Nest stadium in stunned silence.
He was clearly out of sorts and grimaced in pain as he went down into the blocks.

12.88-2.5-1.47=8.91米
8.91/10=0.891
约等于0.99米每秒
希望可以帮到你

(12.88-2.5-1.47)/9=0.99

0.99秒 （12.88-2.5-1.47）/9

前者精确数,后者近似数,主要看小数点后两位,有的就是精确,当然也要具体分析

刘翔：每秒8.52米
特拉梅尔：8.34
加西亚：8.33 关键在于‘路程除以时间等于速度’这个公式

Liu Xiang,born July 13,1983 in Putuo,Shanghai,China,is a Chinese 110 meter hurdler.He is the first Chinese "triple crown" athlete:World Record Holder,World Champion and Olympic Champion.

A、研究刘翔在飞奔的110米时，刘翔的形状和大小对位置没有影响，可以看作质点，故A正确；
B、教练分析其动作要领时，看的就是动作，不能看成质点，故B错误；
C、由A、B的分析可知：有时刘翔可以看成质点，有时不能，故C错误；
D、当刘翔自身的形状和大小对我们研究的问题没有影响时，就可以把刘翔看成质点，故D正确．
故选AD．

LiuXiang is one of the greatest sportsman in the world.

1.首先这不是你看我看的问题,是电脑自动捕捉扫描的,精确度差不多是万分之一秒,这个绝对是权威的,肉眼观察是看不到那么仔细的,况且电视回放速度也不慢,还有角度问题.
2.脚尖先撞线的才赢,他头发等地方先过了没有用,就像之前的女子400米,那个M威廉姆斯和S威廉姆斯同时撞线的,但S的脚尖先踩线了,就是她赢,刘翔这边是一个道理.
3.不用计较这一个冠军了,能复出跑到这样已经是一个非常大的惊喜,我们没必要再苛刻或者希望更大的奇迹了,毕竟第二名也宣告刘翔回来了,而且还保持着以前的竞争力,这难道不是我们要的么?
刘翔加油!o(∩_∩)o...

生物能对外界的刺激做出反应：生物能够对来自环境中的各种刺激作出一定的反应．刘翔参加百米跨栏比赛，听到发令枪响，他像离弦的箭一样冲了出去，这一过程属于生物对外界刺激作出反应的特征．
故答案为：对外界刺激作出反应

一路遥遥领先,冲过终点!赢得毫无悬念.
哈哈·····太冲了哈·?
呃.
刘翔以王者之气力克群雄,冲过重点线,赢得比赛·!
呃.凑合

这个嘛..想到两个,
屋漏偏逢连夜雨,船迟又遇打头风
一失足成千古恨..
我也不确定熬.

Lin Dan is as old as Liu Xiang.
Lin Dan is at the same age as Liu Xiang.
Lin Dan and Liu Xiang is at the same age.
如有问题,欢迎继续追问：）

由近到远 红色的刘翔横空出世 激情在长天燃烧

Liu Xiang performs well and makes great achievements in sports.

可能是更能体现出刘翔的那种突破精神吧!

一千个读者心中就有一千个哈某雷特,理解层次不一样

成功没有终点,鲜花和掌声只代表过去,想获得更大的成功,就应该继续 跋涉.

给你写资料：
0.105秒,离世界百米巨星蒙哥马利保持的0.104的人类最快起跑反应纪录只相差0.001秒,这是刘翔在北京时间8日晚室内田径世锦赛预赛中创造的个人最快起跑反应速度.
此前刘翔的最快起跑速度为0.108秒,这个起跑速度让他创造了12秒88的世界纪录.
0.105秒,这个接近人类极限,也接近0.1秒抢跑犯规的速度,是刘翔自己都没有想到的,但是更令他意想不到的是,这个速度居然“晃点”了劲敌罗伯斯.
误以为刘翔抢跑,罗伯斯竟然在发令枪响后没有起跑,直到看到别人都跨过了第一个栏,意识到自己判断失误的罗伯斯这才开始起跑,当他毫无斗志地最后一个冲过终点时,8秒53的成绩只能接受被淘汰的事实.
刘翔以7秒73的成绩进入下一轮,一场赛前被众人期待的两强对局,却出人意料地以这样的戏剧性结果告终.

既是指前进道路上的困难,也指刘翔奋斗的目标

比赛开始前的瞬间,仿佛时间都已经停止.运动员第一次准备好起跑后,八道的伊诺森西奥表示踏板位置不舒服.比赛重新开始,美国选手特拉梅尔抢跑.下一次如果再有人抢跑将被罚下.　　第三次比赛终于开始,刘翔今天的起跑相当出色,在跨第一个栏之前刘翔就领先了第二名加西亚1个身位.而在本届奥运会100米栏项目上突然冒起的法国新秀也是刘翔的最强劲对手多库里却起跑过慢在第一个栏前只排在第四、五名的位置.　　此后,刘翔在栏间的优势发挥了出来,要知道刘翔可以说是目前世界上栏间表现最后的选手.刘翔越跑越快,与其它队员之前的差距也越来越大.而眼见刘翔跑在前面,身后的各国选手节奏发生了变化.加西亚、特拉梅尔、多库里选后出现在踏栏、压栏的现象.　　最终,刘翔以领先第二名3、4米的优势第一个冲过了终点线,而时间就是破记录的12秒91.美国选手特拉梅尔13秒18第二个冲线,古巴选手加西亚13秒20排在了第三位.

解题思路：必然事件就是一定发生的事件，即发生的概率是1的事件．

根据概念，知
A、B、C都可能发生，也可能不发生，是随机事件；
D、一定会发生，是必然事件．
故选D．

点评：
本题考点： 随机事件．

考点点评： 该题考查的是对必然事件的概念的理解；
解决此类问题，要学会关注身边的事物，并用数学的思想和方法去分析、看待、解决问题，提高自身的数学素养．
用到的知识点为：必然事件指在一定条件下一定发生的事件．不确定事件即随机事件是指在一定条件下，可能发生也可能不发生的事件．

Liu xiang's birthday is on july,13,in1983.

刘翔破记录.

(13.34-12.88)÷12.88=0.0357142857≈3.6%
(13.34-12.88)这个是差的量
12.88因为比最好成绩,最好成绩是单位一,就除以最好成绩,约等于3.6%

借代

(10-1)x=12.88-2.5-1.47
9x=8.91
x=0.99

Born in the 1980s,Liu Xiang is one of the best athletes in our country.He is good at running and 110 meters hurdles.He is even the most capable hurdler in the world.He keeps the best record of 12.88 seconds until now.No one has the ability to break it so far.Among lots of TV programmes,I like the sport games best.And the 110 hurdles races are the most exciting games in them.Everytime I see Liu Xiang running in the track,shouting wildly after the races,I find myself is full of passion in my heart.Especially,the moment when he gets the first prize on the stage,I can't help applauding for his excellent performance.I am deeply moved by his spirit and his great ambitions.The sports spirit of Liu Xiang also inspires me a lot in my life and study.As a young man,Liu Xiang is the best example of making every effort to develop his sport career and break so many records,though he has got many medals now.I think this spirit is worth to learned by all of us.With this ambition,we could defeat any difficulties in our lives and works.Affected by his restless soul,I will never give up and insist my ideals.As one of his fans,I hope that Liu Xiang could do well in the 2008 Beijing Olympic Games,and win more gold medals for our country.I support him forever in my heart.As for myself,I will work as hard as him to make more progress in my study.

解题思路：要求实际身高是多少，根据“图上距离÷比例尺=实际距离”，代入数值，计算即可．

4.7÷[1/40]=188（厘米），
188厘米=1.88米；
答：刘翔的实际身高是1.88米．
故答案为：1.88．

点评：
本题考点： 图上距离与实际距离的换算（比例尺的应用）．

考点点评： 此题有计算公式可用，根据图上距离、比例尺和实际距离三者的关系，进行分析解答即可得出结论．

Liu xiang was born on July 13,1983,Shanghai.He is an excellent hurdler.His running speed is amazing.In 2004,he broke the world record.He is really great.In 2010,he took three champions.I like him,he is my hero

解题思路：平均速度反映物体在一段时间或一段位移内运动平均快慢程度，110m栏，位移一定，平均速度大的用时少，由此可得答案．

110米栏，选手在跑完110米的过程中看谁用时短，由于位移110米一定，用时短的平均速度大．在跑完全程的过程中某时刻瞬时速度大不能说明全程平均速度大，同理撞线时的瞬时速度大也不能说明全程用时少，起跑时的加速度大不能确定跑完全程用时最短，刘翔之所以取得冠军，是因为在110m栏中他第一个冲过终点，即在相同的位移用时最短，也就是平均速度最大．
故选：D．

点评：
本题考点： 平均速度；瞬时速度．

考点点评： 熟悉掌握比较物体运动快慢的方法：相同时间比位移或相同位移比时间，刘翔之所以取得冠军，是因为他的平均速度大，在相同位移中用时最短．而其它选项的大小不能确定他用时最短．

语序问题
体育爱好者对刘翔都很熟悉~

你的题是不是打错了?每次跨越101米高的栏?他是跳蚤吗?:-(0)
如果你没打错那答案是 每次做功为mgh=0.05*101*9.8=49.49焦
如果打错了 那答案是 每次做功为mgh=0.05*1.01*9.8=0.4949焦

刘德华唱歌至今已有十多年了.Its already been 10 years something since Andy Lau became a singer.对于海啸,许多专家都有精辟的见解.Many experts have their own magnificent opinions about the tsunami.他太高...

解题思路：物体保持原来运动状态不变的性质叫惯性．

答：刘翔到达终点后没有立即停下来，而是继续向前跑了一小段距离，这就是由于惯性．
人在跑到终点后，由于惯性要保持原来向前的运动状态，所以不能立即停下来．

点评：
本题考点： 惯性．

考点点评： 此题考查惯性现象的解释．惯性现象的解释尤其需要注意的是起始运动状态的判断．

uns
best runner
Does eat well

Yaoming is taller than Liuxiang
LiuXiang runs faster than YaoMIng.
YaoMIng can speak English better than LiuXiang
YaoMing is oldder than Liuxiang
LiuXiang runs faster than YaoMIng.
YaoMIng can speak English better than LiuXiang Yaoming is taller than Liuxiang
YaoMing is oldder than Liuxiang

解题思路：位移是从初位置到末位置的有向线段；平均速度是总位移与总时间的比值．

A、位移是从初位置到末位置的有向线段，初末位置间距为110m，故位移大小为110m，故A正确；
B、13秒19表示时间间隔，故B错误；
C、刘翔比赛中的平均速度约是
.
V＝
110
13.19=8.3m/s，故C正确；
D、刘翔经过终点线时的速度不一定等于8.3m/s，故D错误；
故选：AC．

点评：
本题考点： 平均速度．

考点点评： 本题考查了位移、时间间隔、平均速度、质点的概念，基础题．

Born in the 1980s, Liu Xiang is one of the best athletes in our country. He is good at running and 110 meters hurdles. He is even the most capable hurdler in the world. He is very great, broke the record of the Athens Olympic Games, received the lausanne super grand prix track and field championship in 2006, broken sleep 13 years British athletes the world record kept.He keeps the best record of 12.88 seconds until now. No one has the ability to break it so far.

C

Liu xiang of personal best time is 12 seconds 88 .
best time意为 最高纪录,最好成绩.
12秒88也可写做12’88

July the thirteenth.(7月13)

他全程的平均速度：
v=
s
t =
110m
12.88s ≈8.54m/s．
故答案为：8.54．