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Significant figure

  1. Jul 7, 2007 #1
    1. I read on my physics book that "zeros located at the end of a number are not significant if they are not followed by a decimal point." it also gave an example: 3000 K, in this case, there is only 1 significant figure. However, the number 93,000,000 m, on my book it says only the first five digits are significant. But i think there are only 2 significant figures according to the previous definition? I was confused.
    2. What does 'size' mean in Physics? means the surface area?
    3. The time it takes to play a CD in your stereo. My teacher said the answer was 3.6 kilosecond. but i didn't get it.

    Thanks a lot.
  2. jcsd
  3. Jul 7, 2007 #2
    1. theres only 2 sig figs
    2. lots of things
    3. 60s X 60min = 1 hour = 3600 seconds

    how old are you?
  4. Jul 7, 2007 #3

    Doc Al

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    Staff: Mentor

    That's certainly not consistent usage. If five significant figures are meant, it should be written as: 9.3000*10^7 or 93.000*10^6, etc.
    "Size" is not a specific physics term. It could mean all sorts of things, depending on context.
    The prefix "kilo" means 1000. Figure out how many minutes that is.
  5. Jul 7, 2007 #4


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    Staff: Mentor

    3.6 kiloseconds? That's a short CD by my standards! :rolleyes:
  6. Jul 9, 2007 #5
    I get it now, thanks.
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