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    heartgirl14's Avatar
    heartgirl14 Posts: 1, Reputation: 1
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    #1

    Sep 17, 2007, 07:55 PM
    solve for speed!
    How many minutes does it take the speed of light to go from the sun to the planet Neptune, a distance of 4.50x10^9 km? (the spee dof lught in free space is 3.00x10^7 m/s).
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Sep 17, 2007, 11:31 PM
    well, the speed of light is 3x10^8 m/s, to start with.

    you just need to use speed = distance/time here.
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