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Calculate square roots

  1. Jan 30, 2006 #1
    i'm doing my online hw as we speak and they problem i'm on is this

    Use your calculator to find the square root of 6.70 × 10^-19

    and i calculated that problem in my calculated and i got

    6.7e^-19 and i typed it in my hw and its giving me an error and saying
    "This question expects a numeric answer"

    can anyone help me?
  2. jcsd
  3. Jan 30, 2006 #2
    i guess just try to type it in as

    6.70 × (10^(-19))
  4. Jan 30, 2006 #3
    I just tried that and it didn't work and i got this message

    "Only a number required. Computer reads units of "× (10^(-19))".
  5. Jan 30, 2006 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    What am I missing here? 6.7e-19 is NOT the square root of 6.7e-19.

    As a side note generally when the e notation is used you do to superscript it.
  6. Jan 30, 2006 #5


    User Avatar

    Staff: Mentor

    Well first of all, your answer is not correct. You show the same number again, just with a different exponential notation. As for getting the online parser to accept your answer, just type it exactly in the same format that it is showing you its question number in. Look at where there are spaces, and how it is showing exponential notation.
  7. Jan 31, 2006 #6
    As berkeman said, the answer is not correct.

    But I want to point out my feelings towards the notation.
    esomething typically means the exponent function - that is, the base of the natural log (e ~= 2.7).

    If you want to denote 10^something, use either a*10b or aEb (the latter being more of an engineer's notation).

    This is just my opinion, but I think most will agree using "aeb" is deceiving.
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