飞机失事的概率高吗?

人在那一瞬间即使是向相反的方向跳跃,但是由于飞机是从10000米高空坠落,人的条约是不足以弥补这个速度差距的,其实你可以算一下,就会知道了,飞机从一万米高空坠落时,退一步讲,及时人是在飞机坠海的那一霎那跳出,飞机自由落体10000米所具有的速度大约是
V²=√2gh=√200000=447m/s=1609km/h
把空气阻力考虑进去的话,即使速度减半的话,也还有大约500公里的时速,而人给的反方向减速也超不过10m/s=36km/h
500-36=464km/h
试想人如果以这种速度坠入海中,是不可能生还的

ABCD four people traveling by plane,on the plane crash,but only three parachutes.
Hence,said,everyone to answer,answer not to come out of jump down.
A:B,who heads A few nose?
B:a.
A:well,give you A hand.
A:C,the person's head several mouths?
C:a.
A:good,also give you A hand.
The D happy,such a simple question.
A:D,the person's head is how much hair?
...
D jumped directly.
Before long,they four people took the airplane again to the tourist.Way again crash,the parachute still only three
The.
They continued to answer the question.
A:B,what time of the People's Republic of China founded?
B:in 1949.
A good.To give you a hand.
A:C,reform and opening,how many people died war?
C:250 million.
A:good,also give you A hand.
A:D,then what is the name of 250 million?
...D have to direct jumped down.
Third,they four people took the airplane again to the tourism,on the way was an accident.
At that time,D said:A,you need not ask,I jumped by myself.
Then with a shock.
A sigh:ah,there are four parachutes !

1.Because of his outstanding performance in the English speech contest,He was awarded the first prize.
2.I have no idea how he survived successfully after the plane crash.
3.It is very lucky f...

飞机失事时有初速度,又受到重力和空气阻力的作用,轨迹类似一条抛物线.在垂直方向上重力做功,速度不断加大,比飞机初速度大很多,落地时速度方向会接近垂直.落地陨石进入大气层的速度很大,重力对其做功不大,所以轨迹偏直.

同学,
the reason of the air crash is＿ unknown＿ to＿us .
这里填写 is unknown to,unknown to sb 对某人来说是未知的
如果认可和满意我的回复,、
手机提问的朋友在客户端上评价点【满意】即可.

Tang's monk mentoring to travel by plane,on the plane crash,but only three parachutes.
Hence,tang's monk said,everyone to answer,answer not to come out of jump down.
Tang's monk:the wu is empty,the sky a few sun?
The wu is empty:a.
Tang's monk:well,give you a hand.
Tang's monk:sand monk,heaven has several moon?
Sand monk:a.
Tang's monk:good,also give you a hand.
The eight quit very happy,such a simple question.
Bajie,have a few stars in heaven?
...
Eight quit jumped down.
Before long,they four people took the airplane again to the tourist.Way again crash,the parachute still only three.
They continued to answer the question.
Tang's monk:the wu is empty,the establishment of the People's Republic of China when?
The wu is empty:in 1949.
Tang's monk:ok.I'll give you a hand.
Tang's monk:sand monk,reform and opening,how many people died war?
Sand monk:250 million.
Tang's monk:good,also give you a hand.
Bajie,then what is the name of 250 million?
...Eight quit and had to jump down.
Third,they four people took the airplane again to the tourism,on the way and an accident,or only three parachutes.
At that time,eight said:teacher,you need not ask,I jumped by myself.
Then with a shock.
Tang's monk and hand:amitabha,the parachute have four...
绝对正确!

解题思路：（1）人耳能听到的声音的频率范围是20～20000Hz，低于20Hz的叫次声波，高于20000Hz叫超声波；
（2）无论是超声波还是次声波，都是人耳听不到的；
（3）超声波也是声波，因此它的传播条件以及速度和普通声波的情况相同．

A、超声波也是声波，不能在真空中传播，该选项说法不正确；
B、超声波不在人的听觉范围之内，因此听不到，该选项说法不正确；
C、飞机上的黑匣子发出超声波，主要是传递信息，该选项说法正确；
D、超声波和声波的传播速度是相同的，在水中的传播速度大约是1500m/s左右，该选项说法不正确．
故选C．

点评：
本题考点： 超声波与次声波．

考点点评： 本题考查了超声波的相关知识，属于声学基础知识的考查，相对比简单．

in the air crash of a Russian plane

黑匣子“黑匣子”是飞机专用的电子记录设备之一,名为航空飞行记录器.里面装有飞行数据记录器和舱声录音器,飞机各机械部位和电子仪器仪表都装有传感器与之相连.它能把飞机停止工作或失事坠毁前半小时的有关技术参数和驾驶舱内的声音记录下来,需要时把所记录的参数重新放出来,供飞行实验、事故分析之用.黑匣子具有极强的抗火、耐压、耐冲击振动、耐海水（或煤油）浸泡、抗磁干扰等能力,即便飞机已完全损坏黑匣子里的记录数据也能完好保存.世界上所有的空难原因都是通过黑匣子找出来的.

我学的英语派上用场了,请笑纳
Tang's monk four people going to travel by plane, the plane crashed on the way, but only three parachutes.
Hence, tang's monk said, everyone to answer, answer not to come out of jump down.
Tang's monk: the wu is empty, the sky a few sun?
Whookon,
The wu is empty: a.
Tang's monk: well, give you a hand.
Tang's monk: sand monk, the several moon in the sky?
Sand monk: a.
Tang's monk: good, also give you a hand.
Of eight quit so happy, so simple question.
Tang's monk: eight quit, the sky has a few stars?
...
Eight quit jumped.
Before long, they four people going to travel by plane again. On the way again crash, parachute or only three.
They continue to answer the question again.
Tang's monk: the wu is empty, when the People's Republic of China as a ?