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2001, question 9 - HSN forum

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2001, question 9


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#1 oddbins

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Posted 23 March 2005 - 05:40 PM

Anyone no how 2 do questin 9, in paper 2? Is it got something 2 do with logs? sad.gif

#2 cc100

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Posted 23 March 2005 - 09:37 PM

Yeah, it looks like a log question to me, but unfortunately we haven't covered the work for it yet so I can't help you much. huh.gif However, my handy answer guide says that k=0.46 if that helps you any.
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#3 George

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Posted 23 March 2005 - 10:03 PM

QUOTE(oddbins @ Mar 23 2005, 05:40 PM)
Anyone no how 2 do questin 9, in paper 2? Is it got something 2 do with logs?  sad.gif

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This is a bit like Example 3 on page 8 of the new notes on Exponentials and Logarithms.

You know that after 1 1/2 hours (ie t = 3/2) the area has doubled (ie A = 2A0)
So e3/2 k = 2.

Your task is then to solve that for k smile.gif





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