The light-year (ly) is a unit of distance commonly used in
Chapter 25, Problem 10P(choose chapter or problem)
Problem 10P
The light-year (ly) is a unit of distance commonly used in astronomy. It is defined as the distance traveled by light in a vacuum in one year. (a) Express 1 ly in km. (b) Express the speed of light, c, in units of ly per year. (c) Express the speed of light in feet per nanosecond.
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