Results 1 to 3 of 3

Math Help - interest

  1. #1
    Is.
    Is. is offline
    Newbie
    Joined
    Sep 2007
    Posts
    2

    interest

    Hello everyone. I'm writing an essay in school and would love to have some wierd facts in the text. I suck at math and turn to you'all geniuses to solve these problems for me!

    Ok:

    The speed of light: 299 792 458 m/s.
    In one year there are 31 557 600 seconds.
    One nanosecond is 0.000 000 001 of a second.

    Now, I'd like to know how long it takes for the light to travel someplace during a certain amount of time. Please use known forms of measurement, and preferable alot of zeros. So that normal people without much knowledge of math can grasp the time. Ok, so these times:

    One nanosecond. (How many meters, or centimeters, or millimeters. I would prefer not to have any 0.xxxx-answers.)

    1000 years.

    And 13,7 billion years.

    God I'm annoying. But if anyone could like, give an answer to this it would be extremely cool in my text.

    Best regards,
    Dawid Dahl.
    Last edited by Is.; September 29th 2007 at 11:59 AM.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Apr 2005
    Posts
    1,631
    No problem.
    Who could refuse somebody who signs his full name like that?

    In one nanosecond:
    (0.000 000 001 sec)(299 792 458 m/sec)
    = 0.299 792 458 meters

    Since you don't like that, then let's get it in centimeters,
    = (0.299 792 458 m)(100cm /1m)
    = 29.979 245 8 cm.

    If you like bigger number, let's see it in millimeters,
    = (29.979 245 8 cm.)(10mm /1cm)
    = 299.792 458 mm.

    -------------------------------------------

    In 1000 years:

    We will use only 365 and 1/4 days for 1 year.

    (1000yr)(365.25day /1yr)(24hr /1day)(3600sec /1hr)
    = (3.15576 x 10^10) seconds, my calculator says.
    = 31,557,600,000 sec.
    = 31 trillion something seconds.

    So,
    (3.15576 x 10^10 sec)(299,792,458 m/sec)
    = 9.460 730 473 x 10^18 m, my calculator says again.
    = 9,460 730 473 000 000 000 meters.
    = 9 460 730 473 000 000 kilometers.

    ------------------------------------------

    In 13.7 Billion years

    You're kidding.
    The zeros will need very large monitor to show them.

    Above we saw 3.15576 x 10^10 seconds in 1000 years.
    That is 3.15576 x 10^7 seconds per year.
    So in 13.7 billion years,
    (1.37 x 10^7 yr)(3.15576 x 10^7 sec/1yr)
    = (4.323 3912 x 10 ^14) seconds.

    So,
    (4.323 3912 x 10^14 sec)(2.997 924 58 x 10^8 m/1sec)
    = 12.961 200 75 x 10^22 meters
    = 12.961 200 75 x 10^19 kilometers

    That means
    about 13, followed by 22 zeros, meters.
    about 13, followed by 19 zeros, kilometers.
    Last edited by ticbol; September 29th 2007 at 02:00 PM. Reason: who, not whole.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Is.
    Is. is offline
    Newbie
    Joined
    Sep 2007
    Posts
    2
    Fantastic! Thank you so much.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Calculate interest rate based on interest in parcels
    Posted in the Business Math Forum
    Replies: 1
    Last Post: February 17th 2011, 10:38 PM
  2. Compound interest at changing interest rates
    Posted in the Business Math Forum
    Replies: 2
    Last Post: October 21st 2010, 05:55 AM
  3. Interest
    Posted in the Calculus Forum
    Replies: 0
    Last Post: December 1st 2008, 08:56 PM
  4. interest
    Posted in the Business Math Forum
    Replies: 1
    Last Post: May 14th 2008, 10:40 AM
  5. Replies: 0
    Last Post: March 18th 2007, 02:31 PM

/mathhelpforum @mathhelpforum