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Physics P5, HELP!

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D-chris91:
Hi, this is really bugging me. I am a prepare-by-self-with-God's-help student and I don't have anyone else to ask. How does one calculate the absolute error in log of a quantity. For example, current, I= 2.6 +/- 0.1A. What is log I including absolute error?
Also, can anyone list safety precautions for Paper 5?

falafail:
the error in a logarithm is the difference between the max. value and the "best" value
for example, if you have to find log x, where x = y +/- z
you find the max. value, which is log (y + z)
and the best value, which is log y
the difference between these two values is the error.

ny2ko:
I usually take the difference between the max value and min value then divide by 2. that seems to work

D-chris91:
Also, can anyone please teach me how to find areas under curve, in case of such a question arising in Paper 2?

falafail:

--- Quote from: D-chris91 on June 08, 2010, 07:18:06 pm ---Also, can anyone please teach me how to find areas under curve, in case of such a question arising in Paper 2?

--- End quote ---

i don't remember ever having to do that in paper 2? :-\

but here http://www.mathsrevision.net/alevel/pages.php?page=2

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