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
2024-03-07
41
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 be greatly influenced if gravity were to suddenly double?
选项
A、Plants.
B、Animals.
C、Buildings.
D、Water.
答案
C
解析
细节题。根据题干中的be greatly influenced if gravity,were to suddenly double定位到原文第六段。该段第二句中提到,(如果地球引力突然加倍)一切建筑物都会面临着巨大的问题。由此可知,C项表述符合原文,故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3513484.html
相关试题推荐
[originaltext]Givingagoodpresentationisallaboutthesimplethings—know
[originaltext]Givingagoodpresentationisallaboutthesimplethings—know
[originaltext]Givingagoodpresentationisallaboutthesimplethings—know
[originaltext]Givingagoodpresentationisallaboutthesimplethings-knowled
[originaltext]Givingagoodpresentationisallaboutthesimplethings-knowled
[originaltext]Givingagoodpresentationisallaboutthesimplethings—know
[originaltext]Givingagoodpresentationisallaboutthesimplethings—kno
[originaltext]Givingagoodpresentationisallaboutthesimplethings—kno
[originaltext]LeonardBernsteinsaidthattoachievegreatthings.youneed
Inthethrillingprogressiveyearsoftheearly20thcentury,fewthingswer
随机试题
[originaltext]M:Excuseme,doestheexpresstrainleaveat2:05?W:No,at1:5
TheEarthcomprisesthreeprincipallayers:thedense,iron-richcore,them
Somefarmersmayreplantcorn.Othersmay【S1】______cornwithsoybeans(大豆).W
Usingacomputerorsmartphoneatnightcancauseustopileonthepounds,
现代的输血理念包括( )。A.以上都不是 B.以上都是 C.风险规避原则
下图标出了某产品从产地Vs到销地Vt的运输网,剪线上的数字表示这条输线的最大通过
4岁男孩因青紫、气短,经常出现蹲踞现象。诊断为“先心病”。在就诊过程中,突然出现
建设工程勘察、设计文件内容需要作重大修改的,()应当报经原审批机关批准后,
治疗慢性泄搏,宜选用的穴位是 A.内关、足三里、中脘B.天枢、足三里、神阙
城市“现代化”的负面影响之一,就是使得城市不透水地表面积不断增加,严重地削弱了地
最新回复
(
0
)