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20 Dec 2022, 10:32
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Official Explanation
According to the passage, which of the following is a prediction that is based on the strength of the gravitational attraction of small asteroids?
Difficulty Level: 600-650
Explanation
Supporting Idea
Regarding small asteroids, the second paragraph states that they have feeble gravity. Any fragments from impacts would escape that gravity, and thus, the passage states, the small asteroids should be monolithic.
A. Small asteroids could be few in number, but the passage does not offer such a prediction.
B. Correct. This prediction is offered in the second paragraph, based on the fact that small asteroids do not have strong gravitational attraction. Any impact fragments will easily escape the weak gravitational attraction of the small asteroids.
C. The passage discusses large asteroids collisions in more detail than small-asteroid collisions, but it provides no basis for predicting how often large and small asteroids will, comparatively, be involved in such collisions.
D. The first paragraph indicates that the rotation rates of small asteroids can exceed the upper limit on the rotation rates of large asteroids, but it does not indicate that most small asteroids have rotation rates that exceed this upper limit.
E. The passage only indicates that there are few observed exceptions to the upper limit on rotation rates of large asteroids, and these exceptions are all smaller than 200 meters in diameter; the passage does not indicate that there are few small asteroids that have very slow rotation rates.
The correct answer is B.
Difficulty Level: 600-650
Explanation
Supporting Idea
Regarding small asteroids, the second paragraph states that they have feeble gravity. Any fragments from impacts would escape that gravity, and thus, the passage states, the small asteroids should be monolithic.
A. Small asteroids could be few in number, but the passage does not offer such a prediction.
B. Correct. This prediction is offered in the second paragraph, based on the fact that small asteroids do not have strong gravitational attraction. Any impact fragments will easily escape the weak gravitational attraction of the small asteroids.
C. The passage discusses large asteroids collisions in more detail than small-asteroid collisions, but it provides no basis for predicting how often large and small asteroids will, comparatively, be involved in such collisions.
D. The first paragraph indicates that the rotation rates of small asteroids can exceed the upper limit on the rotation rates of large asteroids, but it does not indicate that most small asteroids have rotation rates that exceed this upper limit.
E. The passage only indicates that there are few observed exceptions to the upper limit on rotation rates of large asteroids, and these exceptions are all smaller than 200 meters in diameter; the passage does not indicate that there are few small asteroids that have very slow rotation rates.
The correct answer is B.
20 Dec 2022, 10:35
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Official Explanation
The author of the passage mentions “escape velocity” (see line 22) in order to help explain which of the following?
Difficulty Level: 750
Explanation
Evaluation
This question asks about the purpose of the author’s use of the phrase escape velocity in the second paragraph. The author is discussing what occurs after an asteroid collision, in which a large asteroid might be blasted to bits. The bits, according to the author, will move slower than their mutual escape velocity—that is, the speed at which they would have to move to get away from each other and not reassemble, under the influence of gravity, into a rubble pile.
A. The author is emphasizing the asteroid bits that do not escape rather than those that do. Asteroids may become smaller over time, but the fact that most bits move slower than their escape velocity would not help to explain this shrinkage.
B. That the bits of asteroid move slower than their escape velocity helps explain why the fragments reassemble, but it does not help explain the speed with which they reassemble.
C. According to the author, asteroid collisions occur frequently, but the escape velocity of the resulting fragments does not help to explain that frequency.
D. The concept of escape velocity may help explain why small asteroids are monoliths, but it has no relevance, at least as far as the passage indicates, to those asteroids’ rotation rates.
E. Correct. After a collision, it is the asteroid fragments’ failure to reach escape velocity that allows the fragments’ gravitational pull to reassemble them into a rubble pile.
The correct answer is E.
Difficulty Level: 750
Explanation
Evaluation
This question asks about the purpose of the author’s use of the phrase escape velocity in the second paragraph. The author is discussing what occurs after an asteroid collision, in which a large asteroid might be blasted to bits. The bits, according to the author, will move slower than their mutual escape velocity—that is, the speed at which they would have to move to get away from each other and not reassemble, under the influence of gravity, into a rubble pile.
A. The author is emphasizing the asteroid bits that do not escape rather than those that do. Asteroids may become smaller over time, but the fact that most bits move slower than their escape velocity would not help to explain this shrinkage.
B. That the bits of asteroid move slower than their escape velocity helps explain why the fragments reassemble, but it does not help explain the speed with which they reassemble.
C. According to the author, asteroid collisions occur frequently, but the escape velocity of the resulting fragments does not help to explain that frequency.
D. The concept of escape velocity may help explain why small asteroids are monoliths, but it has no relevance, at least as far as the passage indicates, to those asteroids’ rotation rates.
E. Correct. After a collision, it is the asteroid fragments’ failure to reach escape velocity that allows the fragments’ gravitational pull to reassemble them into a rubble pile.
The correct answer is E.
16 Mar 2023, 01:32
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total time: 6minutes
3/4
I have an issue with Q3:
According to the passage, which of the following is a prediction that is based on the strength of the gravitational attraction of small asteroids?
(A) Small asteroids will be few in number.
(B) Small asteroids will be monoliths.
(C) Small asteroids will collide with other asteroids very rarely.
(D) Most small asteroids will have very fast rotation rates.
(E) Almost no small asteroids will have very slow rotation rates.
in options, B and C COULD BE RIGHT, what is the main issue here? why choose B over C?
3/4
I have an issue with Q3:
According to the passage, which of the following is a prediction that is based on the strength of the gravitational attraction of small asteroids?
(A) Small asteroids will be few in number.
(B) Small asteroids will be monoliths.
(C) Small asteroids will collide with other asteroids very rarely.
(D) Most small asteroids will have very fast rotation rates.
(E) Almost no small asteroids will have very slow rotation rates.
in options, B and C COULD BE RIGHT, what is the main issue here? why choose B over C?
