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Thread: [+rep] Exponential Decay problems

  1. #1
    Leet's Avatar
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    [+rep] Exponential Decay problems

    FIRST PROBLEM

    SECOND PROBLEM
    Show work/explanation/calculations for both for full rep. Thanks.

    For whomever solves 'em, I will also draw a picture

  2. #2
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    @Leet Not sure if I did 2nd one correctly but I'm pretty sure about #1
    1.
    A(T) = Ao * e^(kT)
    .5A = A * e^(kT)
    .5 = e ^ (kT)
    ln .5 = kT
    -.693 = 5730k
    k = -.000121
    .91 =e^(-.000121T)
    ln .91 = -.000121T
    -.0943 = -.000121T
    T= 779.4 years
    The table could not have belonged to King Arthur.

    2.
    A(T) = Ao * e^(kT)
    93.4=94.6 * e^(kT)
    .987 = e^(kT)
    ln .987 = k(1)
    -.0131 = k
    94.6 = 98.6 * e ^ (kT)
    .96 = e^(kT)
    ln .96 = kT
    -.041 = -.0131T
    T= 3.1
    Noon - 3.1 = ~9AM
    Last edited by bamag; 02-16-2012 at 02:36 AM.

  3. The Following User Says Thank You to bamag For This Useful Post:

    Leet (02-16-2012)

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