Qualification > Sciences
Edexcel PHYSICS Doubts
studz:
--- Quote from: Nobody on June 05, 2011, 10:50:56 pm ---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? ::)
--- End quote ---
yes please moderator help :P:$
Romeesa-Chan:
--- Quote from: Deadly_king on June 05, 2011, 10:43:21 pm ---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
--- End quote ---
Thank you very much! XD
Dangerous99:
--- Quote from: Nobody on June 05, 2011, 10:50:56 pm ---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? ::)
--- End quote ---
Yes please! how do u figure that out?
they also wrote "change in 20T= 0.5 - 1.0 s [reaction time] leading to correct %"
what reaction time?!
Nobody:
--- Quote from: studz on June 05, 2011, 10:50:23 pm ---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 :)
--- End quote ---
okay, to all those who've got trouble with uncertainty.
Uncertainty of ANY instrument is the SMALLEST readable value of it.
in a metre rule
like this one
the smallest readable value is 1 mm.
so the uncertainty is 1 mm for this ruler.
Dangerous99:
--- Quote from: Nobody on June 05, 2011, 10:55:59 pm ---okay, to all those who've got trouble with uncertainty.
Uncertainty of ANY instrument is the SMALLEST readable value of it.
in a metre rule
like this one
the smallest readable value is 1 mm.
so the uncertainty is 1 mm for this ruler.
--- End quote ---
then shouldnt the uncertainty be 0.01 because the values they give are 18.66 and 18.46 they can only read it upto 0.01?
sorry By the way im just panicking here thats y im pressing on it so much
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