Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN: 9781305116399
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 13, Problem 13.26P
Neutron stars are extremely dense objects formed from the remnants of supernova explosions. Many rotate very rapidly. Suppose the mass of a certain spherical neutron star is twice the mass of the Sun and its radius is 10.0 km. Determine the greatest possible angular speed it can have so that the matter at the surface of the star on its equator is just held in orbit by the gravitational force.
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Astrophysicists believe that our sun started out as a large cloud of hydrogen gas.
Gravitational attraction between the gas molecules caused it to collapse. We can
approximate both the initial cloud of gas and the sun to be spheres of uniform
density. The mass of the initial cloud of gas and the sun are the same. The radius
of the sun is much smaller than the radius of the initial cloud of gas.
The sun now spins once every 24.5 days. The initial hydrogen cloud must have
been ...
O spinning at about the same angular speed.
O spinning much slower.
O spinning much faster.
O not spinning at all.
Astrophysicists believe that our sun started out as a large cloud of hydrogen gas. Gravitational
attraction between the gas molecules caused it to collapse. We can approximate both the initial
cloud of gas and the sun to be spheres of uniform density. The mass of the initial cloud of gas and
the sun are the same. The radius of the sun is much smaller than the radius of the initial cloud of
gas.
The sun now spins once every 24.5 days. Compared to the initial hydrogen cloud, the sun is ...
spinning at about the same angular speed.
spinning much slower.
spinning much faster.
not spinning at all.
The solar system is 25,000 light years from the
center of our Milky Way galaxy. One light year is
the distance light travels in one year at a speed of
3.0 × 10 m/s. Astronomers have determined that
the solar system is orbiting the center of the galaxy
at a speed of 230 km/s.
Assume that the sun is a typical star with a typical mass. If galactic matter is made up of stars,
approximately how many stars are in the center of the galaxy?
Note : Astronomers have spent many years trying to determine how many stars there are in the
Milky Way. The number of stars seems to be only about 10% of what you'll find in part d. In other
words, about 90% of the mass of the galaxy appears to be in some form other than stars. This is
called the dark matter of the universe. No one knows what the dark matter is. This is one of the
outstanding scientific questions of our day.
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N = 6.810¹2
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Chapter 13 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
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