首页
登录
职称英语
Suppose we were in a spaceship in free fall, where objects are weightless, and w
Suppose we were in a spaceship in free fall, where objects are weightless, and w
游客
2024-01-12
7
管理
问题
Suppose we were in a spaceship in free fall, where objects are weightless, and wanted to know a small solid object’s mass. We could not simply balance that object against another of known weight, as we would on Earth. The unknown mass could be determined, however, by placing the object on a spring scale and swinging the scale in a circle at the end of a string. The scale would measure the tension in the string, which would depend on both the speed of revolution and the mass of the object. The tension would be greater, the greater the mass or the greater the speed of revolution. From the measured tension and speed of whirling, we could determine the object’s mass.
Astronomers use an analogous procedure to "weigh" double-star systems. The speed with which the two stars in a double-star system circle one another depends on the gravitational force between them, which holds the system together. This attractive force, analogous to the tension in the string, is proportional to the stars’ combined mass, according to Newton’s law of gravitation. By observing the time required for the stars to circle each other (the period) and measuring the distance between them, we can deduce the restraining force, and hence the masses. [br] According to the passage, the tension in the string mentioned in lines 8-9 is analogous to which of the following aspects of a double-star system?
选项
A、The speed with which one star orbits the other
B、The gravitational attraction between the star s
C、The amount of time it takes for the stars to circle one another
D、The distance between the two stars
E、The combined mass of the two stars
答案
B
解析
Supporting idea
The second paragraph states that an attractive force is analogous to the tension in the string. This attractive force is identified in the previous sentence as the gravitational force between the two stars in a double-star system.
A The second paragraph states that the speed with which the stars circle each other depends on the gravitational force between them, but it is that force that is analogous to the tension in the string.
B Correct. The second paragraph clearly identifies the gravitational force between the two stars as the attractive force that is analogous to the tension in the spring scale’s string.
C The amount of time it takes for the stars to circle one another is necessary for calculating the force that holds them together, but it is the force itself that is analogous to the string’s tension.
D The distance between the stars must be measured if the attraction between them is to be determined, but the attraction, not the distance, is analogous to the string’s tension.
E The combined mass of the two stars is what the procedure is designed to determine; it is analogous to the mass of the small solid object, as described in the first paragraph.
The correct answer is B.
转载请注明原文地址:https://tihaiku.com/zcyy/3357143.html
相关试题推荐
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
Whenyourchildissupposedtobedoinghomework,aretheychattingwiththe
随机试题
Cellphonesprovideinstantaccesstopeople.Theyarecreatingamajor【C1】_
ThereislittleargumentthatPabloPicasso(1881-1973)isthe20thcentury’s
关于病毒学检验中标本采集、处理与运送错误的是A.诊断与病期不同采集的标本不同
以下工程进度网络图中,若结点0和6分别表示起点和终点,则关键路径为()。
电阻应变仪测量电桥的主要功能和作用包括()。A.通过合适的桥路组合满足不同测试
根据《国家电网公司变电验收管理规定(试行)》,现场检查包括()的检查。(A)现场
将下列句子组成一段逻辑严谨、语言流畅的文字,排列顺序最合理的是()。
甲省某医疗机构在临床上确认多例因使用某种注射液发生严重药品不良反应的病例。此时有
甲为某律师事务所(普通合伙)的合伙人,该律师事务所由于业务规模日渐扩大,年应税销
某施工企业与某水泥厂于2020年3月5日签订一份C30的水泥采购合同,而水泥厂家
最新回复
(
0
)