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Percentage uncertainty/ absolute error? watch

1. How would you work this out?

For the first one: isn't it 1/3.5x10^3 then x100. Since the ruler is 1m. I don't get why you would convert it to cm because 3.5x10^3 is in meters. Shouldn't Units be the same ?

But the answer is supposed to be 2.9%.
2. I have my mock tomorrow so please can someone try to help?
3. Hi,

So, the percentage uncertainty is worked out by ((uncertainty)/value *100) and the uncertainty in this case, since the readings have not been repeated, is the precision of the value given, which is the smallest lines per metre you can measure - 0.1*10-3,

and that divided by 3.5*10-3 *100 would = to 2.9%! (2s.f. at most for uncertainties)

Hope that helped! It's quite hard to explain
4. (Original post by grace_zzz)
Hi,

So, the percentage uncertainty is worked out by ((uncertainty)/value *100) and the uncertainty in this case, since the readings have not been repeated, is the precision of the value given, which is the smallest lines per metre you can measure - 0.1*10-3,

and that divided by 3.5*10-3 *100 would = to 2.9%! (2s.f. at most for uncertainties)

Hope that helped! It's quite hard to explain
Yes, it helps thanks. How would you calculated the absolute uncertainty?
5. (Original post by Questioness)
Yes, it helps thanks. How would you calculated the absolute uncertainty?
(Percent uncertainty/100)*Value

(3.5&10^-3)*(2.9/100)=Absolute uncertainty

Might be a bit late :s
6. (Original post by Dieselblue)
(Percent uncertainty/100)*Value

(3.5&10^-3)*(2.9/100)=Absolute uncertainty

Might be a bit late :s
Alright thanks .

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