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
61
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、2,000.
B、4, 000.
C、8,000.
D、16,000.
答案
C
解析
短文中提到,地球的表面离中心4000英里,也就是半径为4000英里,由此可知直径为8000英里。
转载请注明原文地址:http://tihaiku.com/zcyy/3183194.html
相关试题推荐
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.But
随机试题
LOSANGELES—HongKongimmigrantslivingintheAmericancityknownasthe"C
患者,女性,45岁。因白带多、间有阴道少量出血4个月于2013-5-15入院。既
属于子宫肌壁间肌瘤临床表现的项目,错误的是A、经量增多,经期延长 B、白带增
小明早上从家步行去学校,走完一半路程时,爸爸发现小明的数学书丢在家里,随即骑车去
方程y'=f(x)y的通解是:
下列关于债务融资所产生的杠杆效用的说法,正确的有()。A.在假定相同风险的
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
宜采用蜜炙的药物是A.竹茹 B.延胡索 C.马兜铃 D.杜仲 E.当归
下列地铁车站施工顺序中属于盖挖逆作法的是( )。A.先从地表面向下开挖基坑至设
某涵顶进施工,涵孔径为5m,顶部无覆盖土,适宜采用的加固方法为()。A.吊轨纵
最新回复
(
0
)