Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 30 - Nuclear Physics and Radioactivity - General Problems - Page 883: 62

Answer

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Work Step by Step

a. Calculate the mass number using equation 30–1. $$A=(\frac{r}{1.2\times10^{-15}m})^3=(\frac{5000m}{1.2\times10^{-15}m })^3\approx 7\times 10^{55}$$ b. Find the mass of the neutron star in kg. $$m=A(1.66\times10^{-27}kg/u)$$ $$= (7.23\times 10^{55}u)(1.66\times10^{-27}kg/u)$$ $$\approx 1 \times 10^{29}kg$$ c. Calculate the acceleration of gravity on the surface using equation 5–5. $$g=\frac{GM}{r^2}=\frac{(6.67\times10^{-11}Nm^2/kg^2)( 1.20 \times 10^{29}kg)}{(5000m)^2}$$ $$\approx 3\times10^{11}m/s^2$$
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