首页
登录
职称英语
Gravity is one of those things we take completely for granted. And there are
Gravity is one of those things we take completely for granted. And there are
游客
2023-08-04
23
管理
问题
Gravity is one of those things we take completely for granted. And there are two things about it that we take for granted: the fact that it is always there, and the fact that it never changes. If the Earth’s gravity were ever to change significantly, it would have a huge effect on nearly everything because so many things are designed around the current state of gravity.
Gravity is an attractive force between any two atoms. Let’s say you take two golf balls and place them on a table. There will be an incredibly slight gravitational attraction between the atoms in those two golf balls. If you use two massive pieces of lead and some amazingly precise instruments, you can actually measure an
infinitesimal
attraction between them. It is only when you get a gigantic number of atoms together, that the force of gravitational attraction is significant.
The reason why gravity on Earth never changes is because the mass of the Earth never changes. A change in mass great enough to result in a change in gravity isn’t going to happen anytime soon.
But let’s ignore the physics and imagine that, suddenly there was no force of gravity on planet Earth. This would turn out to be a pretty bad day. We depend on gravity to hold so many things down—cars, people, furniture, pencils and papers on your desk, and so on. Everything would start to float. What’s more, two of the more important things held on the ground by gravity are the atmosphere and the water in the oceans, lakes and rivers. Without gravity, the air in the atmosphere would immediately leap into space. This is the problem the moon has—the moon doesn’t have enough gravity to keep an atmosphere around it, so it’s in a near vacuum. Without an atmosphere, any living thing would die immediately and anything liquid would boil away into space.
In other words, no one would last long if the planet didn’t have gravity.
If gravity were to suddenly double, it would be almost as bad, because everything would be twice as heavy. There would be big problems with anything structural. Houses, bridges, skyscrapers, table legs and so on are all sized for normal gravity. Most structures would collapse fairly quickly if you doubled the load on them.
What this answer shows you is just how integral gravity is to our world. We can’t live without it. It is one of the true constants in our lives. [br] What will happen if the gravity suddenly disappeared?
选项
A、Nothing on Earth will begin to float.
B、The air will leap into space in a minute.
C、Some of the living things will die gradually.
D、Water is everywhere on Earth.
答案
B
解析
细节题。根据题干中的the gravity suddenly disappeared定位到原文第四段。该段讲述的是假设地球引力突然消失之后会发生的情形。该段第六句中提到,没有了地球引力,大气层中的空气会立刻流失进太空中。由此可知,B项表述符合原文,故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/2897223.html
相关试题推荐
A、iscompletelythoughtlessB、istheoreticallyworkableC、istoodifficulttobe
Inthethrillingprogressiveyearsoftheearly20thcentury,fewthingswer
[originaltext]M:HelloKate.Howareyou?W:Oh,fine,andyou?Howdidthings
[originaltext]M:HelloKate.Howareyou?W:Oh,fine,andyou?Howdidthings
[originaltext]M:HelloKate.Howareyou?W:Oh,fine,andyou?Howdidthings
[originaltext]Aswithsomanyotherthingsinlife,exercisemayworkbest
[originaltext]Listeningisoneofthefirstthingswelearntodoandoneo
[originaltext]M:Hello,Kate.Howareyou?W:Oh,fine,andyou?Howdidthings
[originaltext]M:Hello,Kate.Howareyou?W:Oh,fine,andyou?Howdidthings
[originaltext]W:Charles,amongotherthings,you’reregardedasoneofAmerica
随机试题
Dogsreallyareourbestfriends,accordingtoaSwedishstudythatsaysca
[originaltext]Oneday,(19)Johnwasdoingsomeshoppinginthemarketwhen
[originaltext]Moderator:WelcometoLeadershipInsider.Itisanonlinecou
[originaltext]ManyorganizationsaroundtheUnitedStatesholdcannedfood
网络的价值以网络节点数平方的速度增长,这个法则被称为( )。A.增长法则 B
患者男,45岁。双侧眼睑下垂2周,伴双下肢无力,晨轻暮重,无呼吸及吞咽困难。临床
A.白色B.淡黄色C.淡绿色D.淡红色E.淡蓝色第二类精神药品处方印刷用纸颜色为
一座建筑高度为25.1m,每层建筑面积均为960m2,除首层层高为5m外,其他各
期货交易所向会员收取的保证金,不得()。A:查封 B:冻结 C:扣划
共用题干 一般资料:求助者,女性,22岁,公司职员案例介绍:求助者月薪1000
最新回复
(
0
)