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09 Apr 2021, 03:45
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HansJK
4. The “widely held predictions” mentioned in line 25 are predictions about the
A. compactness of objects whose mass is millions of times the mass of our Sun
B. velocities of stars orbiting the galactic center
C. amount of matter swirling around the object at the center of the Milky Way
D. amount of matter falling into a theoretical central black hole
E. amount of energy that should be coming from a black hole at the center of the Milky Way
Scientists believe that the amount of
⠀⠀⠀ energy that escapes the black hole should be about
⠀⠀⠀ 10 percent of the matter's rest energy (the energy
⠀⠀⠀ equivalent of its mass according to the equation
⠀⠀⠀ E=mc^2). But when the energy coming from the
(25) galactic center is compared to widely held predictions
⠀⠀⠀ based on how much matter should be falling into a
⠀⠀⠀ theoretical central black hole, there is a discrepancy
⠀⠀⠀ by a factor of a few thousand.
We are comparing energy coming from the centre with widely held predictions.
Widely held predictions on what? On how much energy should come from the centre based on how much matter should be falling into a central black home.
What do we find? We find that there is a discrepancy by a factor of a few 1000.
The actual energy coming from the centre can be compared with predicted amount of energy only. Only those numbers will be comparable.
How is the prediction made? Based on how much matter should fall into a central black hole.
The idea is that if the centre is a black hole, X amount of matter will fall into it and that will make the centre emit Y amount of energy. When the actual energy being emitted is measured, we find that there is a discrepancy by a factor of a few 1000. So then is it a black hole? We don't know.
Hence (E) is correct.
14 Jun 2021, 02:57
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VeritasKarishma
I am still confused between answers B and C in the following question.
2. According to the passage, the dynamical evidence referred to in lines 9–10 supports which of the following?
A. Recent assumptions about the velocities of stars
B. Widely held predictions about the amount of matter a black hole will engulf
C. The existence of an extremely dense object at the center of the Milky Way
D. The contention that too much energy is coming from the mass at the Milky Way's galactic center for that mass to be a black hole
E. The conclusion that a compact object of two to three million times the mass of our Sun is too dense to be anything but a black hole
the passage mentions the following
"This dynamical evidence, based on recently confirmed assumptions about the stars' velocities, argues for an extremely compact object with a mass two to three million times the mass of our Sun. Although according to current theory this makes the mass at the center of the galaxy too dense to be anything but a black hole"
the underlined portion of the passage mentions the presence of an extremely dense object, reading the second sentence we understand that the dense object referred to previously is at the center of the galaxy ( Milky Way).
The bleu portion of the passage states that the theory mentioned previously supports the assertion that the dense object is too dense to be anything but a back hole. This supports answer E. But some people argue in the forum that "the lack of Energy" mentioned in the passage undermines the conclusion supported previously as a result answer E is wrong. however one can argue that the question is focused on the function of the word "the dynamical evidence" which clearly supports the conclusion mentioned in answer E.
Thank you
I am still confused between answers B and C in the following question.
2. According to the passage, the dynamical evidence referred to in lines 9–10 supports which of the following?
A. Recent assumptions about the velocities of stars
B. Widely held predictions about the amount of matter a black hole will engulf
C. The existence of an extremely dense object at the center of the Milky Way
D. The contention that too much energy is coming from the mass at the Milky Way's galactic center for that mass to be a black hole
E. The conclusion that a compact object of two to three million times the mass of our Sun is too dense to be anything but a black hole
the passage mentions the following
"This dynamical evidence, based on recently confirmed assumptions about the stars' velocities, argues for an extremely compact object with a mass two to three million times the mass of our Sun. Although according to current theory this makes the mass at the center of the galaxy too dense to be anything but a black hole"
the underlined portion of the passage mentions the presence of an extremely dense object, reading the second sentence we understand that the dense object referred to previously is at the center of the galaxy ( Milky Way).
The bleu portion of the passage states that the theory mentioned previously supports the assertion that the dense object is too dense to be anything but a back hole. This supports answer E. But some people argue in the forum that "the lack of Energy" mentioned in the passage undermines the conclusion supported previously as a result answer E is wrong. however one can argue that the question is focused on the function of the word "the dynamical evidence" which clearly supports the conclusion mentioned in answer E.
Thank you
