# Name the rapidly rotating disk at the center of the

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9.Name the rapidly rotating disk at the center of the galaxyspinning around the black hole.A.Acceleration disk.B.Galactic circular storm.C.Compaction zone.D.Convection cell.E.Accretion disk.
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Chapter 21 / Exercise 3
An Introduction to Physical Science
Shipman/Wilson
Expert Verified
Points Earned:1/1Correct Answer:Your Response:10.Where do we observe black holes?
Points Earned:1/1Correct Answer:Your Response:11.What is the mass of the supermassive black hole in the center ofthe Andromeda galaxy?
Points Earned:1/1Correct Answer:Your Response:12.Which of the following areas have the most massive black holes(those with the highest masses)?Points Earned:1/1
Your Response:13.How do astronomers measure the mass of asupermassive black hole?A.by comparing its apparent magnitude to its absolute brightnessB.using the formula E = mc2C.by measuring its parallaxD.by comparing its X-ray luminosity to its radio luminosityE.by measuring the speed at which stars move in its vicinity
Points Earned:1/1Correct Answer:Your Response:14.Which of the following are flavors ofquarks?
Points Earned:1/1Correct Answer:Your Response:15.The universe formed Helium nuclei in a process callednucleosynthesis. At that time, what fraction of the mass wasconverted to Helium nuclei (2 protons and 2 neutrons)?
16.What is exchanged between different particles in order tomake the forces work?
Points Earned:1/1Correct Answer:Your Response:17.Which is a reason that we know dark energy is a majorcomponent of the universe?A.Supernovae would not occur without dark energy.B.Dark energy is needed in order that light can escape from supermassive blackholes.C.The universe is flat and regular matter doesn't contribute enough energy densD.The gravity due to regular matter in the universe would have started it contraagain by now without dark energy.E.The universe would not be 2.7 degrees Kelvin today without dark energy.

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Correct Answer, Edwin Hubble, Andromeda Galaxy
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Chapter 21 / Exercise 3
An Introduction to Physical Science
Shipman/Wilson
Expert Verified