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

    Apr 22, 2014, 10:48 AM
    How long does it take to travel from the moon back to the earth?
    At a given point in its orbit, the moon is 240,000 miles from the earth. How long does it take for light from a source on earth to reach a reflector on the moon and then return to earth? The speed of light is 3.00 x 108 m/sec.

    I know:

    • 1609 meters= 1 mile
    • I need to set up an equation with some kind of ratios.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Apr 22, 2014, 10:55 AM
    Well, you know the distance and speed of light. How long does it take to get to the moon? Double your answer or use 480,000.
    Catsmine's Avatar
    Catsmine Posts: 3,826, Reputation: 739
    Pest Control Expert
    		  
    #3

    Apr 22, 2014, 04:19 PM
    You need to compare apples to apples. Convert your 'miles' figure and your velocity into Km first.
    talaniman's Avatar
    talaniman Posts: 54,325, Reputation: 10855
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    #4

    Apr 22, 2014, 04:34 PM
    Miles per second is the ratio and converting it to km per second is also a ratio. Doing it both ways gives you a comparison and the ratio of km to miles.
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