Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
Introduction, Measurement, Estimating
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1-4: Measurement, Uncertainty, Significant Figures
1-5 and 1-6: Units, Standards, SI, Converting Units
1-7: Order-of-Magnitude Estimating
1-8: Dimensions

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 19

A light-year is the distance light travels in one year (at speed =2.998×108 m/s= 2.998 \times 10^8 \textrm{ m/s}).

  1. How many meters are there in 1.00 light-year?
  2. An astronomical unit (AU) is the average distance from the Sun to Earth, 1.50×108 km1.50 \times 10^8 \textrm{ km}. How many AU are there in 1.00 light-year?
a) 9.46×1015 m9.46 \times 10^{15} \textrm{ m}
b) 6.31×104 AU6.31 \times 10^4 \textrm{ AU}

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