Modern Physics for Scientists and Engineers
4th Edition
ISBN: 9781133103721
Author: Stephen T. Thornton, Andrew Rex
Publisher: Cengage Learning
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Question
Chapter 2, Problem 84P
(a)
To determine
The mass-energy imbalance in the reaction occurred.
(b)
To determine
The fraction of initial rest energy that is given up in the reaction.
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In the analysis of a nuclear reaction, scientists identify the rest masses of all reactants and
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Question: If the entire 450 kg antimatter fuel supply of the Enterprise combines with the same amount of
matter and is complete converted into energy, how much energy is then released? How does this compare
to the U.S. yearly energy use, which is roughly 1.0 * 1020J?1
Give your answer as a percentage and give both answers in two significant figures (link).
Remember E = m * c with c =
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1Young, H.. and Freedman, R. (2015) University Physics with Modern Physics. Pearson.
Solution:
Released energy:
Percentage:
During most of its lifetime, a star maintains an equilibrium size in which the inward force of gravity on each atom is balanced by an outward pressure force due to the heat of the nuclear reactions in the core. But after all the hydrogen "fuel" is consumed by nuclear fusion, the pressure force drops and the star undergoes a gravitational collapse until it becomes a neutron star. In a neutron star, the electrons and protons of the atoms are squeezed together by gravity until they fuse into neutrons. Neutron stars spin very rapidly and emit intense pulses of radio and light waves, one pulse per rotation. These "pulsing stars" were discovered in the 1960s and are called pulsars.
A star with the mass (M=2.0×10^30kg) and size (R=3.5×10^8m) of our sun rotates once every 29.0 days. After undergoing gravitational collapse, the star forms a pulsar that is observed by astronomers to emit radio pulses every 0.200 s. By treating the neutron star as a solid sphere, deduce its radius.
Chapter 2 Solutions
Modern Physics for Scientists and Engineers
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