1- can we obtain energy from a Votating black hole ?
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Q: 27) Calculate the time it would take for 5 solar mass black to radiate its energy.
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- 1. Consider our Sun - it is in orbit around the center of our Milky Way Galaxy. The velocity of the Sun in its orbit is about 250 km/s. The distance to the center of the galaxy is about 9.1 kpc (kiloparsecs). We can use Kepler's third law to calculate the mass of the galaxy interior to the Sun's orbit. We assume that the orbit is circular so that the semimajor axis is just the radius of the circular orbit = 9.1 kpc. First we need to calculate the number of AU's in 9.1 kpc. (Note that 1 Крс - 1000 рс - 3260 1t yrs and 1 pc - 206,265 AU.) %3D a =r =9.1kpc = (9.1kpc) 1000 pc 206,265AU] 1kpc AU Sun 1pc26) To what size the Sun should shrink to become a black hole? poate)Imagine there is a large star that produces 2.5 x 1030 Watts of power. If there is a planet orbiting this star from 500 million kms away, what would be the solar constant of that planet? a. 7,900W/m2 b. 52,000 W/m2 c. 250,000 W/m2 d. 800,000 W/m2
- F2 Which of the following can a black hole not "eat" or consume? #3 E another black hole a planet black holes can eat anything O a cloud of gas and dust O a star F3 $ 4 R F4 Q Search DII % 5 F5 T L ☀ < F6 6 Y ☀ F7 & 7 PrtScn U F8Explain what is meant by the Schwarzschild radius of a black hole. Using a Newtonian approx- imation, derive an expression for the Schwarzschild radius, R, of a black hole of mass MBH- Calculate the Schwarzschild radius for a body with mass equal to the Sun's mass, and express your answer in units of kilometres.37) The H-alpha line from a star is observed to be 850 nm. Estimate its redshift
- 3. Consider the following stellar spectra from the sun and from a supercluster of galaxies. ABSORPTION LINES FROM THE SUN ABSORPTION LINES FROMA SUPERCLUSTER OF GALAXIES BAS11 v = 0.07c, d 1 billion light years (a) Describe the movement of the stars in the supercluster relative to the sun. (b) Suppose the absorption lines on the bottom spectrum had varying thickness. What would this indicate about the stars in the supercluster?9. What is Hubble’s law?3- Consider a binary star system in which the two stars are seen to be 1.50" apart. Determine the actual physical separation of those stars (in AU) if this binary system is located 9.50 1.y. from us.
- 1. What is escape velocity? 2. What does it mean to have a binding energy? 3. Under what conditions would you have to achieve in order for a satellite to escape the gravitational field of another body? 4. Why don't astronauts feel the effects of gravity while in orbit around Earth? 5. Why don't we feel the physical attraction from people around us, if there is a force of gravity between every obiect containing mass?(Astronomy) Black Hole Gravity I. If the gravitational acceleration is g=GM/r^2, what gravitational acceleration does a particle feel at the Schwarzshild radius of a 12-solar-mass black hole star? Express your answer in units of m/s2. Please round your answer to three significant digits.1: Briefly explain what are neutron stars and then estimate the escape velocity of a neutron star.