Qualification > Sciences
Edexcel PHYSICS Doubts
Deadly_king:
--- Quote from: Romeesa-Chan on June 05, 2011, 09:29:22 pm ---June 2010, Q2v
Why do we multiply them both with 2? :S
--- End quote ---
This is because you made two readings before calculating the answer. I've not read the question but am pretty sure there was something like initial and final readings.
Since two readings were made, same uncertainty was carried out twice. That's why we multiply it by two ;)
Hope it helps :D
Romeesa-Chan:
--- Quote from: Dangerous99 on June 05, 2011, 10:30:58 pm ---How would you calculate % uncertainty. I know its the first thing u answered in the topic but its not working with this question
They give us 2 values 18.66 and 18.64 and ask us to find the percentage uncertainty.
--- End quote ---
Percentage uncertainty = uncertainty/mean value x 100%
Dangerous99:
--- Quote from: Romeesa-Chan on June 05, 2011, 10:44:51 pm ---
Percentage uncertainty = uncertainty/mean value x 100%
--- End quote ---
yea they did something like that in the mark scheme, they did (0.5/18.64) x 100%
I really dont get where they got the 0.5 from tho
studz:
--- Quote from: Dangerous99 on June 05, 2011, 10:48:11 pm ---yea they did something like that in the mark scheme, they did (0.5/18.64) x 100%
I really dont get where they got the 0.5 from tho
--- End quote ---
even i dint get where did they bring 0.5 from
anyway guys can you list out the uncertainties of measurement of the following apparatus?
1. metre rule
2. voltmeter (not digital)
3. ammeter (not digital)
4. voltmeter (digital)
5. ammeter (digital)
6. Digital stopwatch
by the way, is human error an uncertainty too? Is human error 0.01s?
If it is, then please consider this case:
when a ball is allowed to free fall for 2s, the distance is recorded. (different sizes of ball are used) the distance has an uncertainty, however the uncertainty is human error (0.01s+0.01s) or uncertainty of the metre rule (0.5mm+0.5mm)?
thanks :)
Nobody:
0.5 is the uncertainty.
sometimes it's what YOU HAVE to remember or figure it out yourself.
it's easy ;)
want me to help you out there? ::)
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