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Question: 

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?

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

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

Giancoli 7th Edition, Chapter 33, Problem 9

(1:19)