PHYSICS F/SCI.+ENGRS.,STAND.-W/ACCESS
6th Edition
ISBN: 9781429206099
Author: Tipler
Publisher: MAC HIGHER
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Chapter 9, Problem 24P
To determine
Loss in rotational energy is equivalent to the power output of 100000 stars.
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A pulsar is a rapidly rotating neutron star. The Crab nebula pulsar in the constellation Taurus has a period of 33.5×10−333.5×10^-3 s, radius 10 km. And suppose its mass is 2.1×10302.1×10^30 kg. The pulsar's rotational period will increase over time due to the release of electromagnetic radiation, which doesn't change its radius but reduces its rotational energy.
A. What is the angular momentum of the pulsar? Give your answer in the scientific notation, in the normalized form.
L = x 10 js
B. Suppose the angular velocity decreases at a rate of 4.7×10−144.7×10-14 rad/s2. What is the magnitude of the torque on the pulsar? Give your answer in the scientific notation, in the normalized form.
Tnet = x 10 N m
A pulsar is a rapidly rotating neutron star. The Crab nebula pulsar in the constellation Taurus has a period of 33.5×10−333.5×10-3 s, radius 10 km. And suppose its mass is 2.5×10302.5×1030 kg. The pulsar's rotational period will increase over time due to the release of electromagnetic radiation, which doesn't change its radius but reduces its rotational energy.
What is the angular momentum of the pulsar? Give your answer in the scientific notation, in the normalized form.L=L= ×10×10 J s
Suppose the angular velocity decreases at a rate of 7.4×10−147.4×10-14 rad/s2. What is the magnitude of the torque on the pulsar? Give your answer in the scientific notation, in the normalized form.τnet=τnet= ×10×10 N m
Suppose that the Sun runs out of nuclear fuel and suddenly collapses to form a white dwarf
star. The size shrinks and became as big as earth. Assuming that there is no loss in mass and it
maintained to be a solid sphere, what would be the little white dwarf star's rotation
period. The present rotation of the sun is about 25 days.
Earth's radius = 6.37x10^6
Sun's radius = 6.96x10^8
Chapter 9 Solutions
PHYSICS F/SCI.+ENGRS.,STAND.-W/ACCESS
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