The light-year (ly) is a unit of distance commonly used in astronomy. It is defined as the

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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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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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