Understanding Our Universe
Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 1, Problem 40QAP
To determine

The travel time of light in standard notation and scientific notation.

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A light-year (ly) is the distance light travels in one year (at speed of 2.998 ×× 108 m/sm/s ). An astronomical unit (AU) is the average distance from the Sun to Earth, 1.50 ×× 108 km. 1 year = 3.156 ×× 107 s.   How many meters are there in 1.70 ly? Express your answer using three significant figures. Express in scientific notation!             1.70 ly = _________________m How many AU are there in 1.70 ly light-year? Express your answer using three significant figures. Express in scientific notation! 1.70 ly = _________________AU
If I  drove 55 kilometers per hour, how long would the trip take one way? It takes 452 miles for the round trip and 3hrs and 4 minutes for one way.
The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of 10 in: (a) years, (b) seconds.
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