Suppose you fell into an accretion disc that swept you into a supermassive black hole. On...
Suppose you fell into an accretion disc that swept you into a supermassive black hole. On your way in you radiate 15% of your mass equivalent energy. A) Using your own mass (weigh yourself!) calculate how much radiative energy will be produced by the accretion disc as a result of your falling into the black hole. B) How long would this amount of energy power a 100 Watt light bulb?
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Suppose you fell into an accretion disc that swept you into a
supermassive black hole. On...
Suppose you fell into an accretion disk that swept you into a supermassive black hole. On...
Suppose you fell into an accretion disk that swept you into a supermassive black hole. On your way down, the disk radiates 10 % of your mass-energy, E=mc2. 1) Assume that your mass is 54.5 kg. Calculate how much radiative energy will be produced by the accretion disk as a result of your fall into the black hole. Express your answer using two significant figures. E= ..................... J 2) Calculate approximately how long a 100-watt light bulb would have to...
Suppose you fell into an accretion disk that swept you into a supermassive black hole. On...
Suppose you fell into an accretion disk that swept you into a supermassive black hole. On your way down, the disk radiates 10 % of your mass-energy, E=mc2. 1) Assume that your mass is 54.5 kg. Calculate how much radiative energy will be produced by the accretion disk as a result of your fall into the black hole. Express your answer using two significant figures. E= ..................... J 2) Calculate approximately how long a 100-watt light bulb would have to...
It is said that at the center of every galaxy is a supermassive black hole (the...
It is said that at the center of every galaxy is a supermassive black hole (the picture below shows a picture towards the center of the Milky Way from the Keck Observatory). By observing the orbits of nearby stars, you can get a crude estimate of the mass of this black hole by assuming the stars have a circular orbit. Consider the star SO-2, which has an orbital period of 16.3 years. Its average distance from the black hole is...
3. I'm Supermassive! a) Caleulate the Schwarzschild radius of a 109 solar mass black hole. How...
3. I'm Supermassive! a) Caleulate the Schwarzschild radius of a 109 solar mass black hole. How does your answer compare with the size of our solar system (given by the diameter of Pluto's orbit)? (b) You observe the Doppler shifts of emission lines from gas orbiting at a distance of 60 light- years from the central supermassive black hole in the galaxy M87 (see Figure 21.18b in your textbook). Suppose you now observe emission lines from gas at (i) 30...
3. In this problem, we are going to examine the supermassive black hole in the center...
3. In this problem, we are going to examine the supermassive black hole in the center of our galaxy, Sagittarius A.. (a) (15 points) We can calculate its mass using the orbits of stars gravitationally bound to it in the same way that you can use the Earth's orbit to calculate the mass of the Sun). The orbit of a star, S2, has been fully mapped out. Its period is 15.24 yr and semi-major axis length is 980 AU. Using...
Problem 4. Radiation from the black hole accretion disk.] In this problem you will find the...
Problem 4. Radiation from the black hole accretion disk.] In this problem you will find the temperature of an accretion disk surrounding the black hole, and the wavelength of maximal radiation from the disk. Note that the calculation is super-simplified - if you take more advanced astronomy courses, you will do the same calculation more carefully. In this problem 'BH' means black hole. We will consider the BH of mass equal to twenty solar masses MBH = 20 MSun. (a)...
The gravity of a black hole is so strong that not even light can escape from...
The gravity of a black hole is so strong that not even light can escape from within its surface or “event horizon.” Even outside that surface, enormous energies are needed to escape. Suppose that you are 11.0 km away from the center of a black hole that has a mass of 1.00x1031 kg. If your mass is 72.0 kg, how much do you weigh? NOTE: The answer im getting is 3.968*10^14 N. However, it is not accepting the (*10^14 on...
Now we consider a black hole of the same mass as the Sun: Mbh 2 x 1050 k (a) (2 marks) Show that if you are launching a...
Now we consider a black hole of the same mass as the Sun: Mbh 2 x 1050 k (a) (2 marks) Show that if you are launching a rocket with velocity v upwards from a planet of mass M, you can only escape the planet's gravity if you start from a radius r > 2GM/v2 Hint: Use Newtonian mechanics What if your rocket is acutally a beam of light? If we forget about relativity for a minute, we can put...
Now we consider a black hole of the same mass as the Sun: Mbh 2x 1030 kg. (a) (2 marks) Show that if you are launching...
Now we consider a black hole of the same mass as the Sun: Mbh 2x 1030 kg. (a) (2 marks) Show that if you are launching a rocket with velocity v upwards from a pl M, you can only escape the planet's gravity if you start from a radius r > 2GM/ t of mass Hint: Use Newtonian mechanics. What if your rocket is acutally a beam of light? If we forget about relativity for a minute, we can put...
choose correct answer. no explanation needed QUESTION 36 What does the apparent magnitude of a star...
choose correct answer. no explanation needed
QUESTION 36 What does the apparent magnitude of a star tell us about that star? its mass how bright it appears from Earth its radius how much energy it is emitting QUESTION 37 What is the reason sunspots appear darker than surrounding regions on the Sun's surface? They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. They are too cold to emit any visible light. They...
It is said that at the center of every galaxy is a supermassive black hole (the picture below shows a picture towards the center of the Milky Way from the Keck Observatory). By observing the orbits of nearby stars, you can get a crude estimate of the mass of this black hole by assuming the stars have a circular orbit. Consider the star SO-2, which has an orbital period of 16.3 years. Its average distance from the black hole is...
3. I'm Supermassive! a) Caleulate the Schwarzschild radius of a 109 solar mass black hole. How does your answer compare with the size of our solar system (given by the diameter of Pluto's orbit)? (b) You observe the Doppler shifts of emission lines from gas orbiting at a distance of 60 light- years from the central supermassive black hole in the galaxy M87 (see Figure 21.18b in your textbook). Suppose you now observe emission lines from gas at (i) 30...
3. In this problem, we are going to examine the supermassive black hole in the center of our galaxy, Sagittarius A.. (a) (15 points) We can calculate its mass using the orbits of stars gravitationally bound to it in the same way that you can use the Earth's orbit to calculate the mass of the Sun). The orbit of a star, S2, has been fully mapped out. Its period is 15.24 yr and semi-major axis length is 980 AU. Using...
Problem 4. Radiation from the black hole accretion disk.] In this problem you will find the temperature of an accretion disk surrounding the black hole, and the wavelength of maximal radiation from the disk. Note that the calculation is super-simplified - if you take more advanced astronomy courses, you will do the same calculation more carefully. In this problem 'BH' means black hole. We will consider the BH of mass equal to twenty solar masses MBH = 20 MSun. (a)...
Now we consider a black hole of the same mass as the Sun: Mbh 2 x 1050 k (a) (2 marks) Show that if you are launching a rocket with velocity v upwards from a planet of mass M, you can only escape the planet's gravity if you start from a radius r > 2GM/v2 Hint: Use Newtonian mechanics What if your rocket is acutally a beam of light? If we forget about relativity for a minute, we can put...
Now we consider a black hole of the same mass as the Sun: Mbh 2x 1030 kg. (a) (2 marks) Show that if you are launching a rocket with velocity v upwards from a pl M, you can only escape the planet's gravity if you start from a radius r > 2GM/ t of mass Hint: Use Newtonian mechanics. What if your rocket is acutally a beam of light? If we forget about relativity for a minute, we can put...
choose correct answer. no explanation needed
QUESTION 36 What does the apparent magnitude of a star tell us about that star? its mass how bright it appears from Earth its radius how much energy it is emitting QUESTION 37 What is the reason sunspots appear darker than surrounding regions on the Sun's surface? They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. They are too cold to emit any visible light. They...
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