Giancoli's Physics: Principles with Applications, 7th Edition
33
Astrophysics and Cosmology
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33-1 to 33-3: Stars, Galaxies, Stellar Evolution, Distances
33-4: General Relativity, Gravity and Curved Space
33-5: Redshift, Hubble's Law
33-6 to 33-8: The Big Bang, CMB, Universe Expansion
33-9: Dark Matter, Dark Energy

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 9
Q

# Calculate the density of a white dwarf whose mass is equal to the Sun’s and whose radius is equal to the Earth’s. How many times larger than Earth’s density is this?

A
$\rho_w = 1.83 \times 10^9 \textrm{ kg/m}^3$, $3.3 \times 10^5$ times as large

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