Qualification > Sciences
Edexcel PHYSICS Doubts
Nobody:
--- Quote from: Assi1993 on June 05, 2011, 11:34:18 pm ---Uncertainties in some instruments:
* Stopwatch: 0.2 secs
* Metre rule: 1mm
* Vernier caliper: 0.1mm
* Micrometer: 0.01mm
0.1 for the voltmeter
--- End quote ---
stop watch : 0.1 seconds. >>sure
Vernier caliper: 1mm
Micrometer: 0.1mm
Dangerous99:
--- Quote from: Assi1993 on June 05, 2011, 11:37:45 pm ---which question,paper?? i want to check what it is
--- End quote ---
question 2c page 29
Assi1993:
--- Quote from: Romeesa-Chan on June 05, 2011, 11:43:19 pm ---Please help me with the last question part d! :-\
--- End quote ---
u have 2 just find the gradient!!
rearranging the equation gives us,
lnA=-ux+lnAo
y =mx+c
-u is the gradient ...which u can find...
take a larger gradient triangle always...
so take the 1st plotted value and the last 1...
In this, u can take the coordinates(0,6.869) and (31.74, 5.257)
Romeesa-Chan:
--- Quote from: Assi1993 on June 05, 2011, 11:51:01 pm ---u have 2 just find the gradient!!
rearranging the equation gives us,
lnA=-ux+lnAo
y =mx+c
-u is the gradient ...which u can find...
take a larger gradient triangle always...
so take the 1st plotted value and the last 1...
In this, u can take the coordinates(0,6.869) and (31.74, 5.257)
--- End quote ---
I got it. I am not sure whether my graph is right. Can you lemme know if it's right if I post a picture of it? Please? :D
Dangerous99:
omg i just asked this super genius guy who i feel like marrying rite now By the way, he says the uncertainty is in fact 0.01 but due the fact that reaction time is also involved we take uncertainty as 0.5 (due to human error and because 0.5 is greater than 0.01)
So its 0.5/18.64 x 100%
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