Question 1207558: 1. One light-year is defined by astronomers tobe the distance that a beam of light will travel in 1 year (365 days).If the speed of light is 186,000 miles per second, how many miles are in a light-year? Express your answer in scientific notation.
2. How long does it take a beam of light to reach Earth from the Sun when the Sun is 93,000,000 miles from Earth? Express your answer in seconds, using scientific notation.
Found 2 solutions by josgarithmetic, ankor@dixie-net.com:
Answer by josgarithmetic(39618)   (Show Source):
You can put this solution on YOUR website! Question #1
You are starting with 186000 MILES per SECOND, and you want the distance for the amount of time 365 days.
The time units are what you mostly want to identify and use.
You may find in the process an expression equivalent to
(which is not yet the finished answer).
Answer by ankor@dixie-net.com(22740)  (Show Source):
You can put this solution on YOUR website! One light-year is defined by astronomers to be the distance that a beam of light will travel in 1 year (365 days).
If the speed of light is 186,000 miles per second, how many miles are in a light-year? Express your answer in scientific notation.
1.86(10^5) * 365 * 24 * 3600 = 5.87(10^12) miles
;
2. How long does it take a beam of light to reach Earth from the Sun when the Sun is 93,000,000 miles from Earth? Express your answer in seconds, using scientific notation.
 = 5(10^2)
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