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Question: 

A free neutron $(m = 1.67 \times 10^{-27} \textrm{ kg})$ has a mean life of 880 s. What is the uncertainty in its mass (in kg)?

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: 

$1.3 \times 10^{-54} \textrm{ kg}$

Giancoli 7th Edition, Chapter 28, Problem 8

(1:40)

Chapter 28, Problem 8 is solved.

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Comments

We are missing a squared sign for C in the equation