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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
5
Circular Motion; Gravitation
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5-1 to 5-3: Uniform Circular Motion
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5-4: Nonuniform Circular Motion
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5-5 and 5-6: Law of Universal Gravitation
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5-7: Satellites and Weightlessness
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5-8: Kepler's Laws
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 44
Q

A certain neutron star has five times the mass of our Sun packed into a sphere about 10 km in radius. Estimate the surface gravity on this monster.

A
6.7×1012 m/s26.7 \times 10^{12} \textrm{ m/s}^2
Giancoli 7th Edition, Chapter 5, Problem 44 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. The acceleration due to gravity on this neutron star is capital G—gravitational constant—times 5 times the mass of the Sun which is 5 times 1.99 times 10 to the 30 kilograms divided by the radius of the neutron star, which is 10 kilometers, or 10 times 10 to the 3 meters, squared. And then, that's about, 6.7 times 10 to the 12 meters per second squared or newtons per kilogram squared or newtons per kilogram, depending on which units you prefer. And that means that a dropped object would approach the speed of light in less than a second.

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Giancoli Answers, including solutions and videos, is copyright © 2009-2024 Shaun Dychko, Vancouver, BC, Canada. Giancoli Answers is not affiliated with the textbook publisher. Book covers, titles, and author names appear for reference purposes only and are the property of their respective owners. Giancoli Answers is your best source for the 7th and 6th edition Giancoli physics solutions.