首页
登录
职称英语
If an object weighed one pound on the surface of the earth, how much would it we
If an object weighed one pound on the surface of the earth, how much would it we
游客
2023-11-13
50
管理
问题
If an object weighed one pound on the surface of the earth, how much would it weigh 4,000 miles above the earth? [br]
Because we can feel that things are heavy, we think of weight as being a fixed quality in an object, but it is not really fixed at all. [18]If you could take a one pound packet of butter 4,000 miles out from the earth, it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space? [19]The reason is this: All objects have a natural attraction for all other objects; this is called gravitational attraction, but this power of attraction between two objects gets weaker as they get farther apart. When the butter was at the surface of the earth, [20]it was 4,000 miles from the centre, in other words the radius of the earth is 4,000 miles. When we took the butter 4,000 miles out, it was 8,000 miles from the centre, which is twice the distance. If you double the distance between two objects, their gravitational attraction decreases four times weaker. If you treble the distance, it gets nine times weaker. If you take it four times as far away, it gets sixteen times weaker and so on.
选项
A、because weight is a fixed quality in an object.
B、because they are far away from the centre of the earth.
C、because of the earth’s strong attraction for them.
D、because they are not taken away from the surface of the earth.
答案
C
解析
短文中说,万物之间都具有引力,即地球引力,据此可推断出地球与物体间的引力是我们感觉到物重的原因。
转载请注明原文地址:https://tihaiku.com/zcyy/3183193.html
相关试题推荐
Whichofthefollowingitalicizedpartsisanobjectclause?A、Thefarmerreaped
WhichitalicizedpartinthefollowingsentencesdoesNOTserveasanobject?A、O
Youwanttotellme,andIhavenoobjection______it.A、tohearB、tohearingC、he
Wehavenoobjectionto_____ameetinghere,solongasitispeaceful.A、thereis
Thedirectobjectin"Theboyscoutsteachtheirmembersan"OutdoorCode"befor
Abodyweighs______fromthesurfaceoftheEarth.A、lessthefartheritgetsB、
TheMartiansurfacetemperatureis100degreesbelowzeroatnight,sothatbutt
Ihavenoobjection_________yourstoryagain.A、tohearingB、tohearC、tohavin
______dependsonthedensityofboththeobjectandthewater.A、Anobjectfloats
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
随机试题
Alltheusefulenergyatthesurfaceoftheearthcomesfromtheactivityof
Giventhelackoffitbetweengiftedstudentsandtheirschools,itisnots
医务人员根据确定的医学行为目标,拟订多个诊疗方案,然后从中选出达到最佳诊疗效果的
下列患者可诊断为左室流出道梗阻的肥厚型心肌病的是A.患者血压明显升高,查体:BP
女,33岁,4年前始反复上腹痛,餐前出现,餐后缓解。今晨突然出现剧烈腹痛,来诊。
慢性化脓性骨髓炎的主要X线表现是()A.骨干增粗 B.骨膜增厚 C
ApreciselyBmorepreciselyCprecision
采用定基价格指数时,进行市场状况修正的公式:可比实例在成交日期时的价格×价值时点
20世纪90年代末以来,国家及地方各级政府都将推进城镇化作为一项重大战略予以实施
自动监控系统的深化设计应具有开放结构,()都应标准化。A.装置 B.元件
最新回复
(
0
)