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Could use some help [=

  1. Sep 13, 2007 #1
    hey guys im new to this thing but i really need some help so i thought i would try it out see how it goes..
    so heres the problwm

    light traveling at 3.0 times 10^8 m/sec requires 8.3 minutes to reach the earth. how far away is the sun?

    my teacher is really picky about showing steps and units and equations =\

    any help is greatly appreciated!!!
     
  2. jcsd
  3. Sep 13, 2007 #2

    Doc Al

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    Staff: Mentor

    What's the basic relationship between distance, speed, and time? Don't forget to convert that time to seconds before calculating the distance.
     
  4. Sep 13, 2007 #3
    light is in m/sec soo what do you think you should do first?
     
  5. Sep 13, 2007 #4
    yea thats where is started and converted it into 498 seconds
    then since were using kinematics equations in class i thought i would use

    d=Vit+1/2at^2
    d= distance or delta x
    and for acceration its delta V over delta t

    im just way stuck and im not sure why

    i got 1.2times 10^10th but i think its wrong
     
  6. Sep 13, 2007 #5

    Doc Al

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    Staff: Mentor

    The speed of light is a constant--there's no acceleration.
     
  7. Sep 13, 2007 #6
    alright lets see what you have:
    d = ?
    v = 3.0 times 10^8 m/sec
    t = 498 seconds

    using only v and t you are able to get d
     
  8. Sep 13, 2007 #7
    o wow..
    i see
    all i needed to do was convert it into seconds and then multiply the two huh?
    so it would be 1.49times 10^11
     
  9. Sep 13, 2007 #8
    thanks so much for taking the time to help me out!
     
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