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Uncertainties regarding investigation. - HSN forum

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Uncertainties regarding investigation.


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#1 UncleJohnny

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Posted 26 October 2006 - 04:22 PM

In my investigation I have gathered this list of possible uncertainties. I'm unsure of how to combine them as
I don't have a techer at the moment and can't find my notes, help. Im doing the viscosity of water...

Scale Reading uncertainties:
Vernier Scale= 5 x10-5m
10 cm3 Measuring cylinder = 5x10-8 m3
25cm3 Measuring Cylinder= 2.5x10-7 m3
Stopwatch= 0.05s
metre stick= 5x10-3m

Random U= 2.42 x10-8

I just can't remember how to do it sad.gif.

#2 Michael

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Posted 26 October 2006 - 05:34 PM

You make them into percentage uncertainties and the highest is the one you write down as a combination of them all.

#3 ad absurdum

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Posted 26 October 2006 - 05:45 PM

I thought you would express them as percentage errors and add them vectorially (i.e. you will have to find \sqrt{a^2 + b^2 + c^2 + d^2 + ...} where the letters represent the magnitude of your percentage errors.). I'm not totally sure either though.
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#4 waitingforan_alibi

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Posted 27 October 2006 - 07:30 PM

both sort of right-
if one (percentage) uncertainty is more than 3 times any other then it is the dominant uncertainty
otherwise do what ad absurdium said, although the word vectorially is WRONG! sorry, but it is!





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