21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
6th Edition
ISBN: 9780393874921
Author: PALEN
Publisher: Norton, W. W. & Company, Inc.
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Chapter 7, Problem 14QP
To determine
Select the correct option for the direction of revolution in the plane of the Solar System.
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Stars that contract the quickest to land on the zero-age main sequence on the H–R diagram
a.
are the most massive.
b.
are the least massive.
c.
are neither the most massive nor the least massive.
d.
all stars contract at the same rate.
e.
stars similar in mass to the sun.
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
1pc
A galaxy whose spiral arms have a woolly or fluffy appearance are called
a.
flocculent.
b.
hairy.
c.
vague.
d.
foggy.
e.
fleecy.
Chapter 7 Solutions
21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
Ch. 7.1 - Prob. 7.1CYUCh. 7.2 - Prob. 7.2CYUCh. 7.3 - Prob. 7.3CYUCh. 7.4 - Prob. 7.4CYUCh. 7.5 - Prob. 7.5CYUCh. 7 - Prob. 1QPCh. 7 - Prob. 2QPCh. 7 - Prob. 3QPCh. 7 - Prob. 4QPCh. 7 - Prob. 5QP
Ch. 7 - Prob. 6QPCh. 7 - Prob. 7QPCh. 7 - Prob. 8QPCh. 7 - Prob. 9QPCh. 7 - Prob. 10QPCh. 7 - Prob. 11QPCh. 7 - Prob. 12QPCh. 7 - Prob. 13QPCh. 7 - Prob. 14QPCh. 7 - Prob. 15QPCh. 7 - Prob. 16QPCh. 7 - Prob. 17QPCh. 7 - Prob. 18QPCh. 7 - Prob. 19QPCh. 7 - Prob. 20QPCh. 7 - Prob. 21QPCh. 7 - Prob. 22QPCh. 7 - Prob. 23QPCh. 7 - Prob. 24QPCh. 7 - Prob. 25QPCh. 7 - Prob. 26QPCh. 7 - Prob. 27QPCh. 7 - Prob. 28QPCh. 7 - Prob. 29QPCh. 7 - Prob. 30QPCh. 7 - Prob. 31QPCh. 7 - Prob. 32QPCh. 7 - Prob. 33QPCh. 7 - Prob. 34QPCh. 7 - Prob. 35QPCh. 7 - Prob. 36QPCh. 7 - Prob. 37QPCh. 7 - Prob. 38QPCh. 7 - Prob. 39QPCh. 7 - Prob. 40QPCh. 7 - Prob. 41QPCh. 7 - Prob. 42QPCh. 7 - Prob. 43QPCh. 7 - Prob. 44QPCh. 7 - Prob. 45QP
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- The age of the Milky Way Galaxy has been estimated to be at least 13 billion years based on a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from HI regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A*.arrow_forward2. Over several months an astronomer observes an exoplanet orbiting a distant star at a distance of 5.934 AU. Its orbit period was projected to be 3.875 years. Convert the orbit radius to meters and period to seconds. Use this information to calculate the mass M of the star in kg and solar mass units (Mo). Star Exoplanet Orbit radius (m) Orbit period (s) Star mass (kg) Star mass (Mo)arrow_forwardWhich of the following is true in our solar system? 1. The planets travel in a circular path, with the sun being in the very center. 2. The planets travel in an elliptical path, with the sun being in the very center. 3. The planets travel in an elliptical path, with the sun at one of the focus points. 4. The planets travel in a helical path, with the sun located along the central axis.arrow_forward
- GMm F, r2 F(r = R) The surface gravity g of a body is. The acceleration due to gravity that an object m would feel on the surface of the body. A. Show that the surface gravity of Earth is ge = 9.8 m/s². B. Determine the surface gravity of the Sun. C. Determine the surface gravity of the Sun when it becomes a red giant star, assuming RG 1 AU. Use this answer to explain the significant mass loss rates observed in these objects.arrow_forwardWhy are all large celestial bodies (stars, planets, larger moons) very nearly spherical in shape? a because of the centrifugal force from the body's rotation b because of tidal forces c because gravity tries to pull every part of the celestial body to the center d because of the pressure from the heat in the body's corearrow_forwardRead this main idea: The sun is the center of our solar system. Choose three details that go with the main idea. The sun's gravity holds the planets in place. It provides them with heat and light. The largest stars, called supergiants, are 1,500 times bigger than our sun. It takes Earth 365 days to orbit the sun. Jupiter takes 12 years! Our sun is not the largest or hottest star. It is a medium sized yellow star. Radio telescopes use radio waves to show stars in great detail. Astronomers long ago and today use star charts to map star locations. All of the planets in our solar system revolve around one star-our sun. Stars can be blue, white, yellow, or red. Blue stars are the hottest. A reflector telescope bounces star light through mirrors.arrow_forward
- The approximate diameter of the disk of the Milky Way is a. 8.0 A.U. b. 8.0 light-years. c. 80 light-years. d. 80,000 light-years. e. 80,000,000 light-years.arrow_forward#16arrow_forwardAccording to the solar nebula theory, why is the Earth’s orbit nearly in the plane of the Sun’s equator?arrow_forward
- As a star collapses, the conservation of angular momentum states that it will spin a. faster. b. slower. c. at the same rate. d. slower, then faster. e. faster, then slower.arrow_forwardIf the Hubble constant equals 70 km/s/Mpc, the age of the universe roughly equals a. 6 billion years. b. 10 billion years. c. 12 billion years. d. 14 billion years. e. 20 billion years.arrow_forwardIf our universe is expanding, what are the implications for the separation between two stars within our galaxy? A. The two stars are moving farther apart. B. The two stars are moving closer together. C. The distance between the two stars is unaffected. D. The question is impossible to answer without more information.arrow_forward
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