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OG18官方指南,建议同学们刷3遍。第一遍做题了解题型和考点,第二遍精刷,第三遍集中解决疑难问题。建议考生第一遍刷题采用官方正版纸质书籍,若遇到疑难问题,欢迎在此专区查阅解析,提供解析,参与题目讨论,与所有考生一起解决疑难问题。
阅读RC-15427 (第2/4题) Time Cost00:00
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该题平均耗时:2m48s,平均正确率:52.1%

建议使用官方纸质指南,查看对照完整题目

When asteroids collide, some collisions cause an asteroid to spin faster others slow it down. If asteroids are all monoliths---single rocks---undergoing random collisions, a graph of their rotation rates should show a bell-shaped distribution with statistical "tails" of very fast and very slow rotators. If asteroids are rubble piles, however, the tail representing the very fast rotators would be missing, because any loose aggregate spinning faster than once every few hours (depending on the asteroid's bulk density) would fly apart. Researchers have discovered that all but five observed asteroids obey a strict limit on rate of rotation. The exceptions are all smaller than 200 meters in diameter, with an abrupt cutoff for asteroids larger than that.

The evident conclusion---that asteroids larger than 200 meters across are multicomponent structures or rubble piles---agrees with recent computer modeling of collisions, which also finds a transition at that diameter. A collision can blast a large asteroid to bits, but after the collision those bits will usually move slower than their mutual escape velocity. Over several hours, gravity will reassemble all but the fastest pieces into a rubble pile. Because collisions among asteroids are relatively frequent, most large bodies have already suffered this fate. Conversely, most small asteroids should be monolithic,because impact fragments easily escape their feeble gravity.

【OG20-P458-604题】

The discovery of which of the following would call into question the conclusion mentioned ?(highlight)

  • 分析A选项
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  • 分析B选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • 分析C选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • 分析D选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • 分析E选项
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
该题目由网友xk24rb提供。更多GMAT题目请
暂无雷哥网文字解析
当前版本由 百香果蜂蜜茶 更新于2017-08-09 16:57:30 感谢由 百香果蜂蜜茶 对此题目的解答所做出的贡献。

解题思路:注意题干当中的call into question,定位在第二段红色高亮的部分。原始逻辑是:”rubble piles不会特别快,所以直径大于200的是rubble piles”


A 原文讨论的是直径大于200的,无关

B 原文讨论的是直径大于200的,无关

C 一周一次,是慢的,加强

D 一小时一次,是快的,削弱,正确

E 24小时一次,是慢的,加强



题目讨论 6条评论)

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    郑合初

    根据第一题 超过200米的全部都是组合行星, 速度都很慢。小于200米直径的都是单行星,可快可慢
    0 0 回复 2020-01-22 04:29:21
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    shangym

    注意读题,the tail representing the very fast rotators would be missing,说明rubble pile不快
    0 0 回复 2019-07-28 18:13:04
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    700召唤小太阳

    大星星有S limit
    而且没有S limit的星星D都小于200
    所以D大于200的星星就是大星星
    
    于是我找到了一个没有S limit,且D大于200的星星,就可以削弱这个结论了。
    0 0 回复 2018-10-27 20:16:10
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    Jingsa

    定位第一段  If asteroids are rubble piles, however, the tail representing the very fast rotators would be missing, because any loose aggregate spinning faster than once every few hours (depending on the asteroid's bulk density) would fly apart. 
    所以找超过200 meter的然后转速还比once every few hours 快的就可以了
    0 0 回复 2018-04-04 16:13:22
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      AUCHUI回复Jingsa

      正解。

      0 0 回复 2018-11-16 20:30:11

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    糖糖要加油

    额 这个题目应该定位在哪句比较准确?我定位到第一段去了“If asteroids are rubble piles, however, the tail representing the very fast rotators would be missing,because any loose aggregate spinning faster than once every few hours (depending on the asteroid's bulk density) would fly apart.
    0 0 回复 2018-01-17 16:31:55
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    LOL666

    Over several hours, gravity will reassemble all but the fastest pieces into a rubble pile.
    0 0 回复 2017-12-23 21:18:20
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