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Thread: [+fullrep] Science Help [light years/light seconds/scientific notation]

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    [+fullrep] Science Help [light years/light seconds/scientific notation]

    "If 9.46x10^12 km = 1 ly, how many kilometers are there in 1 ls?"

    Use GRASS method, and explain the reasoning behind your steps so I can understand it; basically you're teaching me this because my teacher made some dumbass in our class teach this to us.

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    I will be honest with you, I'm not exactly sure about the "GRASS" method you are talking about, but I'll try to explain it as best as I can.

    Since you are going from light years to light seconds, you will divide by 365 to obtain the length in km of one light-day, by 24 to obtain the length in km of one light-hour, and by 3600 to obtain the length in km of one light-second.

    Therefore, 9.46*10^12/365/24/3600 = 3.00*10^5 km per light-second.

    Hope it helps!

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    Mint (06-10-2013),wrath (06-10-2013)

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    OHHHHHHHHH I get it!

    Thanks!

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    Quote Originally Posted by aznboy1997 View Post
    I will be honest with you, I'm not exactly sure about the "GRASS" method you are talking about, but I'll try to explain it as best as I can.

    Since you are going from light years to light seconds, you will divide by 365 to obtain the length in km of one light-day, by 24 to obtain the length in km of one light-hour, and by 3600 to obtain the length in km of one light-second.

    Therefore, 9.46*10^12/365/24/3600 = 3.00*10^5 km per light-second.

    Hope it helps!
    Leave it to an Aznboy right? I was looking at it, but I was always horrible with conversions. Thanks for explanation though, I was also curious.

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    Mint (06-10-2013)

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    Quote Originally Posted by aznboy1997 View Post
    I will be honest with you, I'm not exactly sure about the "GRASS" method you are talking about, but I'll try to explain it as best as I can.

    Since you are going from light years to light seconds, you will divide by 365 to obtain the length in km of one light-day, by 24 to obtain the length in km of one light-hour, and by 3600 to obtain the length in km of one light-second.

    Therefore, 9.46*10^12/365/24/3600 = 3.00*10^5 km per light-second.

    Hope it helps!
    ;____; I get 299,974.6322

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    Quote Originally Posted by Mint View Post
    ;____; I get 299,974.6322
    He rounded it up and put it into scientific notation.

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    Quote Originally Posted by Bettser View Post
    He rounded it up and put it into scientific notation.
    I know I can look up how to turn stuff into scientific notation...but explain it to me?

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    Quote Originally Posted by Mint View Post
    I know I can look up how to turn stuff into scientific notation...but explain it to me?
    You know what rounding is so I dont need to explain that but for scientific notation:

    You got 299,974.6322 as your answer. It looks quite tedious and simplified it looks like:

    2.999746322 x10^5

    If you multiply those numbers^, you get your original answer. Teachers normally want it to two decimal points so:

    2.99x10^5 (Same answer, just more simplified)

    Teachers also usually want the answer rounded to which arrives you at aznboy's answer.

    3.00x10^5

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    Quote Originally Posted by Bettser View Post
    You know what rounding is so I dont need to explain that but for scientific notation:

    You got 299,974.6322 as your answer. It looks quite tedious and simplified it looks like:

    2.999746322 x10^5

    If you multiply those numbers^, you get your original answer. Teachers normally want it to two decimal points so:

    2.99x10^5 (Same answer, just more simplified)

    Teachers also usually want the answer rounded to which arrives you at aznboy's answer.

    3.00x10^5
    Wait, where did you get the exponent '5' from?

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    Quote Originally Posted by Mint View Post
    Wait, where did you get the exponent '5' from?
    By moving the decimal point

    Example:
    2.999746322 x10^5
    29.99746322 x10^4
    299.9746322 x10^3
    2999.746322 x10^2

    Are all the same as
    299,974.6322


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