UNDERSTANDING THE UNIVERSE(LL)-W/CODE
3rd Edition
ISBN: 9780393869903
Author: PALEN
Publisher: NORTON
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Question
Chapter 15, Problem 4QAP
To determine
The speed of stars closer and away from the centre.
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The type of galaxy that consists almost entirely of old stars and is thus less blue (more yellow and
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Suppose that the outer stars of a galaxy have an orbital velocity of 150 km/s. If the radius of the galaxy is 4.0 kpc (1??? = 3.1 × 1016 ??), what is the orbital period of the outer
stars in years?
A star at a distance of 50000 light years from the center of a galaxy has an orbital speed of 100 km/s around the galactic center. What is the total mass of the galaxy located at distances smaller than 50000 light years from the center?
A. 7.6 ×1010 solar masses
B. 4.2 ×1011 solar masses
C. 3.5 ×1010 solar masses
D. 1.4 ×1011 solar masses
Is the answer C?
M = (r x v^2) / G
= 50000 x 9.46e15 x (100000^2) / 6.67e-11 / 2e30 (the Sun's mass)
= 3.55e10 solar masses
Chapter 15 Solutions
UNDERSTANDING THE UNIVERSE(LL)-W/CODE
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QAPCh. 15 - Prob. 2QAPCh. 15 - Prob. 3QAPCh. 15 - Prob. 4QAPCh. 15 - Prob. 5QAPCh. 15 - Prob. 6QAP
Ch. 15 - Prob. 7QAPCh. 15 - Prob. 8QAPCh. 15 - Prob. 9QAPCh. 15 - Prob. 10QAPCh. 15 - Prob. 11QAPCh. 15 - Prob. 12QAPCh. 15 - Prob. 13QAPCh. 15 - Prob. 14QAPCh. 15 - Prob. 15QAPCh. 15 - Prob. 16QAPCh. 15 - Prob. 17QAPCh. 15 - Prob. 18QAPCh. 15 - Prob. 19QAPCh. 15 - Prob. 20QAPCh. 15 - Prob. 21QAPCh. 15 - Prob. 22QAPCh. 15 - Prob. 23QAPCh. 15 - Prob. 24QAPCh. 15 - Prob. 25QAPCh. 15 - Prob. 26QAPCh. 15 - Prob. 27QAPCh. 15 - Prob. 28QAPCh. 15 - Prob. 29QAPCh. 15 - Prob. 30QAPCh. 15 - Prob. 31QAPCh. 15 - Prob. 32QAPCh. 15 - Prob. 33QAPCh. 15 - Prob. 34QAPCh. 15 - Prob. 35QAPCh. 15 - Prob. 36QAPCh. 15 - Prob. 37QAPCh. 15 - Prob. 38QAPCh. 15 - Prob. 39QAPCh. 15 - Prob. 40QAPCh. 15 - Prob. 41QAPCh. 15 - Prob. 42QAPCh. 15 - Prob. 43QAPCh. 15 - Prob. 44QAPCh. 15 - Prob. 45QAP
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- Disk population stars have I. circular orbits in the plane of the galaxy II. randomly tipped, elliptical orbits III. old stars with low metal content IV. young stars with heavy metal content a. I and II b. I and III c. II and III d. II and IV e. I and IVarrow_forwardThe Sun is located in a. the center of the Milky Way Galaxy b. the bulge of the Milky Way Galaxy c. the halo of the Milky Way Galaxy d. the disk of the Milky Way Galaxyarrow_forwardMost of the dark matter in a galaxy is located in the ________ which allows the more luminous matter to rotate around the center of the galaxy at a faster speed than predicted by Kepler's 3rd Law.arrow_forward
- The Tully-Fischer method relies on being able to relate the mass of a galaxy to its rotation velocity. Stars in the outer-most regions of the Milky Way galaxy, located at a distance of 50 kpc from the galactic centre, are observed to orbit at a speed vrot = 250 km s−1. Using Kepler’s 3rd Law, determine the mass in the Milky Way that lies interior to 50 kpc. Express your answer in units of the Solar mass.arrow_forwardWhich of the following statements about the different types (shapes) of galaxies are correct? (choose all that apply) whatever type a galaxy is at its birth, that’s what it will be for all time what type we see a galaxy to be just depends on the angle at which we happen to see it; all galaxies look roughly the same in shape all galaxies start out as ellipticals, but some later evolve to be spirals and irregulars collisions and mergers between galaxies can sometimes change a galaxy’s type (shape)arrow_forwardMost distances in the Galaxy are measured in light-years instead of meters. Why do you think this is the case?arrow_forward
- What will be the long-term future of our Galaxy?arrow_forwardThe dwarf galaxy in Sagittarius is the one closest to the Milky Way, yet it was discovered only in 1994. Can you think of a reason it was not discovered earlier? (Hint: Think about what else is in its constellation.)arrow_forwardAssume that the Sun orbits the center of the Galaxy at a speed of 220 km/s and a distance of 26,000 lightyears from the center. A. Calculate the circumference of the Sun’s orbit, assuming it to be approximately circular. (Remember that the circumference of a circle is given by 2pR, where R is the radius of the circle. Be sure to use consistent units. The conversion from light-years to km/s can be found in an online calculator or appendix, or you can calculate it for yourself: the speed of light is 300,000 km/s, and you can determine the number of seconds in a year.) B. Calculate the Sun’s period, the “galactic year.” Again, be careful with the units. Does it agree with the number we gave above?arrow_forward
- The best evidence for a black hole at the center of the Galaxy also comes from the application of Kepler’s third law. Suppose a star at a distance of 20 light-hours from the center of the Galaxy has an orbital speed of 6200 km/s. How much mass must be located inside its orbit?arrow_forwardBriefly describe the main parts of our Galaxy.arrow_forwardBased on your analysis of galaxies in Table 26.1, is there a correlation between the population of stars and the quantity of gas or dust? Explain why this might be.arrow_forward
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