Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 39, Problem 60PQ
To determine
The frequency of the light when it is observed far from the neutron star.
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A supernova explosion of a 2.00 x 1031 kg star produces 1.00 x 1044 J of energy. What is the ratio Δm/m of mass destroyed to the original mass of the star?
A supernova explosion of a 2.00×1031 kg star produces 1.00×1044 J of energy. (a) How many kilograms of mass are converted to energy in the explosion? (b) What is the ratio Δm / m of mass destroyed to the original mass of the star?
A supernova explosion of a 2.00×1031 kg star produces 1.00×1044 kg of energy. (a) How many kilograms of mass are converted to energy in the explosion? (b) What is the ratio Δm / m of mass destroyed to the original mass of the star?
Chapter 39 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 39.1 - Which of the following are (approximately)...Ch. 39.2 - Suppose the primed and laboratory observers want...Ch. 39.7 - Prob. 39.3CECh. 39.10 - Prob. 39.4CECh. 39.12 - Prob. 39.5CECh. 39 - Prob. 1PQCh. 39 - Prob. 2PQCh. 39 - Prob. 3PQCh. 39 - In an airport terminal, there are two fast-moving...Ch. 39 - Prob. 5PQ
Ch. 39 - Prob. 6PQCh. 39 - Prob. 7PQCh. 39 - Prob. 8PQCh. 39 - Prob. 9PQCh. 39 - Prob. 10PQCh. 39 - Prob. 11PQCh. 39 - Prob. 12PQCh. 39 - Prob. 13PQCh. 39 - Prob. 14PQCh. 39 - Prob. 15PQCh. 39 - Prob. 16PQCh. 39 - Prob. 17PQCh. 39 - Prob. 18PQCh. 39 - Prob. 19PQCh. 39 - Prob. 20PQCh. 39 - Prob. 21PQCh. 39 - Prob. 22PQCh. 39 - Prob. 23PQCh. 39 - A starship is 1025 ly from the Earth when measured...Ch. 39 - A starship is 1025 ly from the Earth when measured...Ch. 39 - Prob. 26PQCh. 39 - Prob. 27PQCh. 39 - Prob. 28PQCh. 39 - Prob. 29PQCh. 39 - Prob. 30PQCh. 39 - Prob. 31PQCh. 39 - Prob. 32PQCh. 39 - Prob. 33PQCh. 39 - Prob. 34PQCh. 39 - Prob. 35PQCh. 39 - Prob. 36PQCh. 39 - Prob. 37PQCh. 39 - Prob. 38PQCh. 39 - As measured in a laboratory reference frame, a...Ch. 39 - Prob. 40PQCh. 39 - Prob. 41PQCh. 39 - Prob. 42PQCh. 39 - Prob. 43PQCh. 39 - Prob. 44PQCh. 39 - Prob. 45PQCh. 39 - Prob. 46PQCh. 39 - Prob. 47PQCh. 39 - Prob. 48PQCh. 39 - Prob. 49PQCh. 39 - Prob. 50PQCh. 39 - Prob. 51PQCh. 39 - Prob. 52PQCh. 39 - Prob. 53PQCh. 39 - Prob. 54PQCh. 39 - Prob. 55PQCh. 39 - Prob. 56PQCh. 39 - Consider an electron moving with speed 0.980c. a....Ch. 39 - Prob. 58PQCh. 39 - Prob. 59PQCh. 39 - Prob. 60PQCh. 39 - Prob. 61PQCh. 39 - Prob. 62PQCh. 39 - Prob. 63PQCh. 39 - Prob. 64PQCh. 39 - Prob. 65PQCh. 39 - Prob. 66PQCh. 39 - Prob. 67PQCh. 39 - Prob. 68PQCh. 39 - Prob. 69PQCh. 39 - Prob. 70PQCh. 39 - Joe and Moe are twins. In the laboratory frame at...Ch. 39 - Prob. 72PQCh. 39 - Prob. 73PQCh. 39 - Prob. 74PQCh. 39 - Prob. 75PQCh. 39 - Prob. 76PQCh. 39 - Prob. 77PQCh. 39 - In December 2012, researchers announced the...Ch. 39 - Prob. 79PQCh. 39 - Prob. 80PQCh. 39 - How much work is required to increase the speed of...Ch. 39 - Prob. 82PQCh. 39 - Prob. 83PQCh. 39 - Prob. 84PQCh. 39 - Prob. 85PQ
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A supernova explosion of a 1.15 × 1031 kg star produces 2.1 × 1044 J of energy.Randomized Variablesm = 1.15 × 1031 kgE = 2.1 × 1044
Part (a) How many kilograms of mass are converted to energy in the explosion?
Part (b) What is the ratio Δm / m of mass destroyed to the original mass of the star?
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31) If G is given by 6.67 X 10-11 and the mass of the Sun is 1.98 X 1030 kg, what would be the radius of the Sun if it could be condensed into a black hole? A black hole is an object for which the escape velocity (2GM/R)½ is c the speed of light. For comparison the radius of the Sun is 6.958 X105 km.
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A star’s spectrum emits more radiation with a wavelength of 690.0 nm than with any other wavelength.
If the star is 9.78 ly from Earth and its radius is 7.20 × 108 m, what will an Earth-based observer measure for this star’s intensity? Stars are nearly perfect blackbodies. (Note: ly stands for light-years.)
Answer in W/m2
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In December 2012, researchers announced the discovery of ultramassive black holes, with masses up to 40 billion times themass of the Sun (seen as the bright spot at the center of the galaxy near the center of Fig. P39.78). a. What is the Schwarz-schild radius of a black hole that has a mass 40 billion times that of the Sun? b. Suppose this black hole is 1.3 billion ly from theEarth. What is the angular radius of a galaxy that is 1.7 billion lybehind it, as viewed from the Earth? FIGURE P39.78
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With what type of electromagnetic radiation would you observe: A. A star with a temperature of 5800 K? B. A gas heated to a temperature of one million K? C. A person on a dark night?
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A supernova explosion of a star with a rest mass of 1.97 x 1031 kg, produces 1.02 x 1044 J of kinetic energy and radiation.i) How many kilograms of mass are converted to energy in the explosion?ii) Calculate the ratio of the mass destroyed to the original mass of the star.
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What is the average density of a neutron star that has the same mass as the sun if the radius of the neutron star is 41.591 km?(express the answer in the proper SI unit and without scientific notation)
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A star is 15.0 light - years (ly) from Earth. (a) At what constant speed must a spacecraft travel on its journey to the star so that the Earth–star distance measured by an astronaut onboard the spacecraft is 3.00 ly? (b) What is the journey’s travel time in years as measured by a person on Earth and (c) by the astronaut?
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The Sun and all Main Sequence stars derive their luminosity by fusing hydrogen to helium; in particular
4 1H ® 1 4He + Energy (photons)
The mass of a proton is 1.0078 AMU, while the mass of a helium nucleus is 4.0026 AMU.
a) How much mass is ``lost'' (in AMU and kg) in fusing four H atoms to one helium? This is called the mass defect.
b) Mass isn't really lost, of course. It is converted to energy via E=mc2. How much energy in joules (J) is liberated in a single reaction?
c) How many reactions per second are required to account for the entire luminosity of the Sun?
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Observations of neutrinos emitted by the supernova SN1987a place an upper limit of 20 eV on the rest energy of the electron neutrino. If the rest energy of the electron neutrino were, in fact, 20 eV, what would be the speed difference between light and a 1.5 MeV electron neutrino?
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Astronomers determine that a particular star in our galaxy is moving toward Earth at a speed of 716.0 km/s with respect to the Earth. If Earth receives a wavelength ? = 689.6 nm from this star, what was the wavelength emitted by the star?
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A star is 12.2 ly (light-years) from Earth.
HINT
(a)
At what constant speed (in m/s) must a spacecraft travel on its journey to the star so that the Earth–star distance measured by an astronaut onboard the spacecraft is 4.36 ly?
m/s
(b)
What is the journey's travel time in years as measured by a person on Earth?
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