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Get Full Access to Physics For Scientists And Engineers: A Strategic Approach With Modern Physics - 3 Edition - Chapter 12 - Problem 88cp
Get Full Access to Physics For Scientists And Engineers: A Strategic Approach With Modern Physics - 3 Edition - Chapter 12 - Problem 88cp

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# During most of its lifetime, a star maintains an

ISBN: 9780321740908 69

## Solution for problem 88CP Chapter 12

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics | 3rd Edition

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Problem 88CP

Problem 88CP

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. A star with the mass (M = 2.0 × 1030 kg) and size (R = 7.0 × 108 m) of our sun rotates once every 30 days. After undergoing gravitational collapse, the star forms a pulsar that is observed by astronomers to emit radio pulses every 0.10 s. By treating the neutron star as a solid sphere, deduce its radius.

b. What is the speed of a point on the equator of the neutron star?

Your answers will be somewhat too large because a star cannot be accurately modeled as a solid sphere. Even so, you will be able to show that a star, whose mass is 106 larger than the earth’s, can be compressed by gravitational forces to a size smaller than a typical state in the United States!

Step-by-Step Solution:

Solution 88 CP

Step 1 of 5

In this problem, in part(a) To find the radius of the star, by treating neutron star as solid sphere. (b) To find the speed of the point on the equator of the neutron star.

Step 2 of 5

Step 3 of 5