Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Grab 20% off any Target Test Prep GMAT Focus plan during our Flash Sale. Just enter the coupon code FLASH20 at checkout to save up to $320. The offer ends on Tuesday, April 30.
Sayali narrates her experience of succeeding on the GMAT after 4 attempts & 2 years of preparations. Sayali achieved 99 percentile score on GMAT Focus edition after significantly improving her performance in verbal section of the GMAT
We present a collection of 30 GMAT Focus practice questions covering Problem Solving, Data Sufficiency, Data Insights, and Critical Reasoning. Take this GMAT practice quiz live with peers, analyze your GMAT study progress, and more.
Struggling with Table analysis questions on GMAT Data Insights? You're not alone! With typical accuracy rates hovering around 45% and average solving time of 3.25 minutes per question, Table analysis can be a real challenge.
After just 3 months of studying with the TTP GMAT Focus course, Conner scored an incredible 755 (Q89/V90/DI83) on the GMAT Focus. In this live interview, he shares how he achieved his outstanding 755 (100%) GMAT Focus score on test day.
In this conversation with Ankit Mehra, IESE MBA and CEO & Co-Founder, of GyanDhan, we will discuss how prospective MBA students can finance their MBA education with education loans and scholarships.
What do András from Hungary, Pablo from Mexico, Conner from the United States, Giorgio from Italy, Leo from Germany, and Rishab from India have in common? They all earned top scores on the GMAT Focus Edition using the Target Test Prep course!
Ready to conquer GMAT's toughest Data Insights questions? Unlock the secrets of Graphical Interpretation & Two-Part Analysis with our expert-led webinar! Limited seats!
What do András from Hungary, Conner from the United States, Giorgio from Italy, Leo from Germany, and Saahil from India have in common? They all earned top scores on the GMAT Focus Edition using the Target Test Prep course!
Astronomers theorize that a black hole forms when a massive
[#permalink]
09 Jul 2008, 23:34
Astronomers theorize that a black hole forms when a massive object shrinks catastrophically under its own Line gravity, leaving only a gravitational (5)field so strong that nothing escapes it. Astronomers must infer the existence of black holes, which are invisible, from their gravitational influence on the visible bodies surrounding them. (10)For example, observations indicate that gas clouds in galaxy M87 are whirling unusually fast about the galaxy’s center. Most astronomers believe that the large concentration (15)of mass at the galaxy’s center is a black hole whose gravity is causing the gas to whirl. A few skeptics have argued that the concentration of mass necessary to explain the speed of the (20)whirling gas is not necessarily a black hole: the concentration in M87 might be a cluster of a billion or so dim stars. The same hypothesis might have been applied to the galaxy NGC 4258, (25)but the notion of such a cluster’s existing in NGC 4258 was severely undermined when astronomers measured the speed of a ring of dust and gas rotating close to the galaxy’s (30)center. From its speed, they calculated that the core’s density is more than 40 times the density estimated for any other galaxy. If the center of NGC 4258 were a star cluster, the (35)stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart. -------------------------------------------------------------------------------- Q10: The skeptics mentioned in the first paragraph would be most likely to agree with the astronomers mentioned in line 13 about which of the following statements concerning the galaxy M87? A. The speed of the gas whirling around the center of M87 is caused by a dense object that is not a black hole. B. The concentration of mass at the center of M87 is probably a large cluster of dim stars. C. The presence of a black hole at the center of M87 is the most likely explanation for the speed of the gas whirling about the galaxy’s core. D. The speed of the gas whirling around the center of M87 is caused by a large concentration of mass at the core of M87. E. The gravitational influence of a star cluster would not be strong enough to account for the speed of the gas whirling around the core of M87.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Re: Astronomers theorize that a black hole forms when a massive
[#permalink]
10 Jul 2008, 05:45
i would pick D for this one. We have to avoid answer choices that specify one choice and focus on an answer choice that both parties would agree with ...
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
gmatclubot
Re: Astronomers theorize that a black hole forms when a massive [#permalink]