问题 问答题

(8分)2014年3月8日发生的“马航失联事件”举世瞩目,飞机上的黑匣子也成了人们谈论的话题,

(1)黑匣子应采用抗压能力强,熔点   的特殊材料制成.为了容易发现黑匣子,黑匣子的颜色应设计成     .(选填“黑色”或“橙红色“)

(2)黑匣子发出频率为3.75×104Hz的波在海水中的传播速度大于它在空气中的传播速度,此波应该为     (选填“电磁波”或“超声波”),它在1s时间里振动     次.

(3)体积为0.01m3的黑匣子落在海水下4000m深处,则它受到海水的压强为    Pa,受到的浮力为

   N,将它打捞到海面的过程中浮力做功为     J.(海水深度为1.03×103kg/m3

答案

(1)高;橙红色;(2)超声波;3.75×104;(3)4.12×107;103;4.12×105

题目分析:(1)为了防止飞机发生爆炸及燃烧时毁坏黑匣子,黑匣子应采取熔点高的材料制作;橙红色的光传播的距离较远,人眼对这种颜色也比较敏感,所以黑匣子应该设计成橙红色;

(2)声波在海水中的传播速度大于它在空气中的传播速度,而电磁波在水中的传播速度小于空气中的传播速度,所以黑匣子发出的波为超声波;频率是物体1s内振动的次数,频率为3.75×104Hz,则1s振动3.75×104次。

(3)

打捞到海面浮力做功:

阅读理解

阅读文章后,从第50至53题所给A、B、C、D四个选项中,选出最佳答案。

For the first 10 years after the Wright brothers' original flight in 1903, flying was only a sport.It was a pastime for daredevils (不怕死的人).One very determined daredevil was Bessie Coleman.She was the first black woman to fly an airplane.

Coleman, born in Texas in 1892, the tenth of 13 children, dreamed of becoming a pilot.To earn money for flying lessons, she washed other people's laundry.At the age of 19 she took a train to Chicago, where she began to study in a beauty school.For five years she worked in a barbershop, and then she looked for a flying school.There were none in the United States that would teach women, but Coleman heard that there were schools in France that would.So she studied the language and sailed off to France.

When she returned to the United States in 1921, Coleman was the first licensed black woman pilot.Her "aerial acrobatic (航空特技)exhibitions" impressed audiences.She took her airplane through loop-the-loops and flew upside down.She did slow rolls and sharp rolls.Audiences were amazed when she performed a move called "falling leaf."

Coleman became a famous person.She performed her acrobatic flights all over the country.She also spoke to African-American audiences in schools, churches, and theatres.Fly, she told them.Be a part of the new aviation(航空) industry.Many young African-American men listened to her.Some became honored military pilots during World War II.Many others made their careers in aviation.

On April 29, 1926, Coleman was flying when a tool carelessly left in the airplane hit the control stick.The plane went into a dive and did not recover.The daring 34-year-old pilot was killed.

小题1:Bessie Coleman went to France to ____.

A.work in a barbershop

B.study the language

C.look for a flying school

D.take flying lessons小题2:Which of the following is probably an "aerial acrobatic"?

A.Flying upside down.

B.Speaking to audiences.

C.Getting a pilot's licence.

D.Impressing audiences.小题3:The underlined word "exhibition" in paragraph 3 means _____.

A.a holding back

B.a public show

C.falling leaf

D.loop-the-loops小题4:What would be the best title for the passage?

A.An early daredevil

B.The first flying woman

C.A pioneer in aviation

D.The first licensed black pilot

单项选择题