COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 25, Problem 45QAP
To determine
The half-life of the particles which were at rest in the laboratory.
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3. • A futuristic spaceship flies past Pluto with a speed of 0.964c
relative to the surface of the planet. When the spaceship is
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80.0 us. What is the duration of the light pulse as measured by
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I Review I Constants
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.
Part A
= 2.0 x 1030 kg) and size (R
3.5 x 10° m) of our sun rotates once every 35.0 days. After undergoing gravitational collapse,
A star with the mass (M
the star forms a pulsar that is observed by astronomers to emit radio pulses every 0.100 s. By treating the neutron star as a solid sphere,…
•8 o A positive tau (7*, rest energy = 1777 MeV) is moving
with 2200 MeV of kinetic energy in a circular path perpendicular
to a uniform 1.20 T magnetic field. (a) Calculate the momentum of
the tau in kilogram-meters per second. Relativistic effects must be
considered. (b) Find the radius of the circular path.
Chapter 25 Solutions
COLLEGE PHYSICS
Ch. 25 - Prob. 1QAPCh. 25 - Prob. 2QAPCh. 25 - Prob. 3QAPCh. 25 - Prob. 4QAPCh. 25 - Prob. 5QAPCh. 25 - Prob. 6QAPCh. 25 - Prob. 7QAPCh. 25 - Prob. 8QAPCh. 25 - Prob. 9QAPCh. 25 - Prob. 10QAP
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- A muon formed high in Earth's atmosphere travels toward Earth at a speed v = 0.990c for a distance of 4.60 km as measured by an observer at rest with respect to Earth. It then decays into an electron, a neutrino, and an antineutrino. (a) How long does the muon survive according to an observer at rest on Earth? (b) Compute the gamma factor associated with the muon. (c) How much time passes according to an observer traveling with the muon? (d) What distance does the muon travel according to an observer traveling with the muon? (e) A third observer traveling toward the muon at c/2 measures the lifetime of the particle. According to this observer, is the muons lifetime shorter or longer than the lifetime measured by the observer at rest with respect to Earth? Explain.arrow_forward(a) Beta decay is nuclear decay in which an electron is emitted. If the electron is given 0.750 MeV of kinetic energy, what is its velocity? (b) Comment on how the high velocity is consistent with the kinetic energy as it compares to the rest mass energy of the electron.arrow_forward(a) Calculate the relativistic quantity =11v2/c2for 1.00-TeV protons produced at Fermilab. (b) If such a proton created a +having the same speed, how long would its life be in the laboratory? (c) How far could it travel in this time?arrow_forward
- Our solar system orbits the center of the Milky Way galaxy. Assuming a circular orbit 30,000 ly in radius and an orbital speed of 250 km/s, how many years does it take for one revolution? Note than this is approximate, assuming constant speed and circular orbit, but it is representative of the time for our system and local stars to make one revolution around the galaxy.arrow_forwardOur solar system orbits the center of the Milky Way Galaxy. Assuming a circular orbit 30,000 ly in radius and an orbital speed of 250 km/s, how many years does it take for one revolution? Note that this is approximate, assuming constant speed and circular orbit, but it is representative of the time for our system and local stars to make one revolution around the galaxy.arrow_forwardA muon formed high in Earth's atmosphere travels toward Earth at a speed v = 0.990c for a distance of 4.60 km as measured by an observer at rest with respect to Earth. It then decays into an electron, a neutrino, and an antineutrino. (a) How long does the muon survive according to an observer at rest on Earth? (b) Compute the gamma factor associated with the muon. (c) How much time passes according to an observer traveling with the muon? (d) What distance does the muon travel according to an observer traveling with the muon? (e) A third observer traveling toward the muon at c/2 measures the lifetime of the particle. According to this observer, is the muons lifetime shorter or longer than the lifetime measured by the observer at rest with respect to Earth? Explain.arrow_forward
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