The Cosmic Perspective (9th Edition)
9th Edition
ISBN: 9780134874364
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 18, Problem 49EAP
Why Black Holes Are Safe. Explain why the principle of conservation of
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an introduction on what is the event horizon of a black holes?
How do scientists / astronomers spot a black hole? *
A. by using gamma rays and x-rays to detect high energy sources
B. by using radioactive waves to detect high energy sources
C. By using high energy to detect gamma rays and x-rays
D. By using massive telescopes to detect gamma ray
1. Distance from a black hole considered to be a point of no return
a) Chandrasekhar limit
b) Tolman-Oppenheimer-Volkoff limit
c) Event horizon
2. Can the Sun collapse by itself to form a blackhole?
a) yes
b) no
3. What type of radiation is currently used by the scientists to detect black hole candidates?
a) Gamma rays
b) X-rays
c) Hawking radiation
Chapter 18 Solutions
The Cosmic Perspective (9th Edition)
Ch. 18 - Prob. 1VSCCh. 18 - Prob. 2VSCCh. 18 - Prob. 3VSCCh. 18 - Prob. 4VSCCh. 18 - Prob. 5VSCCh. 18 - Prob. 1EAPCh. 18 - Prob. 2EAPCh. 18 - Prob. 3EAPCh. 18 - Prob. 4EAPCh. 18 - Prob. 5EAP
Ch. 18 - Prob. 6EAPCh. 18 - Prob. 7EAPCh. 18 - Prob. 8EAPCh. 18 - Prob. 9EAPCh. 18 - 10. In what sense is a black hole like a hole in...Ch. 18 - Il. What do we mean by the singularity of a black...Ch. 18 - Prob. 12EAPCh. 18 - Prob. 13EAPCh. 18 - Prob. 14EAPCh. 18 - Prob. 15EAPCh. 18 - Prob. 16EAPCh. 18 - Prob. 18EAPCh. 18 - Prob. 19EAPCh. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Prob. 21EAPCh. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Prob. 23EAPCh. 18 - Prob. 24EAPCh. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Decide whether tile statement makes sense (or is...Ch. 18 - Prob. 27EAPCh. 18 - Choose the best answer lo each of the following....Ch. 18 - Prob. 29EAPCh. 18 - Choose the best answer lo each of the following....Ch. 18 - Prob. 31EAPCh. 18 - Prob. 32EAPCh. 18 - Prob. 33EAPCh. 18 - Prob. 34EAPCh. 18 - Prob. 35EAPCh. 18 - Prob. 36EAPCh. 18 - Black Holes in Popular Culture. Expressions such...Ch. 18 - Prob. 39EAPCh. 18 - Prob. 41EAPCh. 18 - Prob. 42EAPCh. 18 - Prob. 43EAPCh. 18 - Prob. 44EAPCh. 18 - Prob. 45EAPCh. 18 - Prob. 46EAPCh. 18 - Prob. 47EAPCh. 18 - Prob. 48EAPCh. 18 - Why Black Holes Are Safe. Explain why the...Ch. 18 - Surviving the Plunge. The tidal forces near a...Ch. 18 - Prob. 52EAPCh. 18 - Prob. 53EAPCh. 18 - Prob. 54EAPCh. 18 - Prob. 55EAPCh. 18 - Prob. 56EAPCh. 18 - Prob. 57EAPCh. 18 - Prob. 58EAPCh. 18 - Prob. 59EAPCh. 18 - Prob. 60EAPCh. 18 - Prob. 61EAP
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- A stellar black hole may form when a massive star dies. The mass of the star collapses down to a single point. Imagine an astronaut orbiting a black hole having eight times the mass of the Sun. Assume the orbit is circular. a. Find the speed of the astronaut if his orbital radius is r = 1 AU. b. Find his speed if his orbital radius is r = 11.8 km. c. CHECK and THINK: Compare your answers to the speed of light in a vacuum. What would the astronauts orbital speed be if his orbital radius were smaller than 11.8 km?arrow_forwardWhat characteristics must a binary star have to be a good candidate for a black hole? Why is each of these characteristics important?arrow_forwardHow can black holes lead to parallel universes? And how do black holes lead to parallel universes?arrow_forward
- In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun that occupy less space than our moon. Suppose that one of these black holes has a mass of 1x10^3 suns and a radius equal to one-half the radius of our moon. What is the density of the black hole in g/cm^3? The radius of our sun is 7.0x10^5 km, and it has an average density of 1.4x10^3 kg/m^3. The diameter of the moon is 2.16x10^3 miles.arrow_forwardYou discover by dropping particles into it that the Event Horizon (Schwartzschild Radius) of a black hole is 171 km. How massive is it? (enter just the number in solar masses)arrow_forwardIn 1999, scientists discovered a new class of black holes with masses 100 to 10000 times the mass of our sun, but occupying less space than our moon. Suppose that one of these black holes has a mass of 1x10^3 suns and a radius equal to one-half the radius of our moon. What is the density of the black hole in g/cm^3? The radius of our sun is 7.0x10^5km and it has an average density of 1.4x10^3kg/m^3. The diameter of the moon is 2.16x10^3 miles. Note: the volume of a sphere is V=4/3 pie r^3arrow_forward
- 1. Let’s say we have a black hole with a mass 10 times that of the Sun (the Sun’s mass is 2 x 1030kg so the mass of the black hole is then 2 x1031 kg) Using the definitions for G and c what Schwarzschild radius of this black hole be? g=6.67 x 10-11 m3 kg-1 s-2 c=3 x 108 m s-1arrow_forwardIn 1999 scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun but occupying less space than our moon. Suppose that of these black holes has a mass of 1x10^3 sun's and radius equal to one-half the radius of our moon. What is the density in grams per cubic centimeter? The mass of the sun is 2.0x10^30 kg and the radius of the moon is 2.16x10^3 mi.arrow_forwardOnce again in this chapter, we see the use of Kepler’s third law to estimate the mass of supermassive black holes. In the case of NGC 4261, this chapter supplied the result of the calculation of the mass of the black hole in NGC 4261. In order to get this answer, astronomers had to measure the velocity of particles in the ring of dust and gas that surrounds the black hole. How high were these velocities? Turn Kepler’s third law around and use the information given in this chapter about the galaxy NGC 4261-the mass of the black hole at its center and the diameter of the surrounding ring of dust and gas-to calculate how long it would take a dust particle in the ring to complete a single orbit around the black hole. Assume that the only force acting on the dust particle is the gravitational force exerted by the black hole. Calculate the velocity of the dust particle in km/s.arrow_forward
- A black hole is an object with mass, but no spatial extent. It truly is a particle. A black hole may form from a dead star. Such a black hole has a mass several times the mass of the Sun. Imagine a black hole whose mass is ten times the mass of the Sun. a. Would you expect the period of an object orbiting the black hole with a semimajor axis of 1 AU to have a period greater than, less than, or equal to 1 yr? Explain your reasoning. b. Use Equation 7.6 to calculate this period.arrow_forwardA student becomes so excited by the whole idea of black holes that he decides to jump into one. It has a mass 10 times the mass of our Sun. What is the trip like for him? What is it like for the rest of the class, watching from afar?arrow_forward
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