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
64
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
Truefriendshipislikehealth,______isseldomknowntillitislost.A、thevalu
MarycallsRobertto______.[br][originaltext]M:Hello.W:Hello,thisisMar
Whatdoelderlypeopledototheuniversity?A、Bringagreatdealofusefulexper
按贷款风险分类法尽管借款人目前有能力偿还贷款本息,但存在一些可能对偿还产生不利影
航空旅客按照收入水平划分分为()A.休闲旅客 B.普通收入旅客 C.探亲访友
关于建筑区划内,规划用于停放汽车的车位、车库归属的说法,正确的是()A:
(2015年真题)患者,男,70岁,近期发现骨痛,疲乏,驼背。临床诊断为老年性骨
A.婴儿颌骨骨髓炎 B.亚急性颌骨骨髓炎 C.放射性颌骨骨髓炎 D.急性化
根据规定,应税大气污染物和水污染物的具体适用税额的确定和调整,负责统筹考虑本地区
施工图预算的方法中,简单易懂,便于掌握,审查速度快,便于发现问题,但问题出现的原
最新回复
(
0
)