A2 physix p5!!! help me pweez! :(

[kitty_toxic]

guys i need help in mostly the uncertainty questions, you know usually in question 2! for example in oct/nov 2007 Q2) part b, how are we supposed to find the errors for log data, and in may/june 2008 Q2) part b, error for ln data??? im havin alot of problems in solving these type of complex uncertainty questions, can sum1 please give me a sum up or step by step on how to solve this!

 

[kiara15]

can any1 guide me how to calculate absolute errors in gradient and y intercept? alsoow to how to draw worst fit line in graph? plzz

 

[kitty_toxic]

come on peopleeeeeeeeeeeeeeeeeeeeeee!!!!!!!!!!!!!!!!!!!!!!!!!!!!! please help usssssssssssssssss!!!!!!

 

[kitty_toxic]

can any1 guide me how to calculate absolute errors in gradient and y intercept? alsoow to how to draw worst fit line in graph? plzz

EXACT SAME THING IM HAVING PROBS IN!!!!!!!!!!!!

 

[Ramsha007]

come on peopleeeeeeeeeeeeeeeeeeeeeee!!!!!!!!!!!!!!!!!!!!!!!!!!!!! please help usssssssssssssssss!!!!!!

Why don't u check other threads of phy p5 InshAllah they will be helpful to u

 

[anishniroula]

guys i need help in mostly the uncertainty questions, you know usually in question 2! for example in oct/nov 2007 Q2) part b, how are we supposed to find the errors for log data, and in may/june 2008 Q2) part b, error for ln data??? m havin alot of problems in solving these type of complex uncertainty questions, can sum1 please give me a sum up or step by step on how to solve this!

While calculating uncertainity in log you should subtract the highest value and lowest value and divide it by 2.
For eg: if it is log(4.0+- 0.2) then uncertainity would be[log(4.2)-log(3.8)/2].
Hoped it helped. If you have any problems you can ask me freely.

 

[kitty_toxic]

While calculating uncertainity in log you should subtract the highest value and lowest value and divide it by 2.
For eg: if it is log(4.0+- 0.2) then uncertainity would be[log(4.2)-log(3.8)/2].
Hoped it helped. If you have any problems you can ask me freely.

wait i dont get it, why divide by 2?????? for ex: in oct/nov 2011 for lgT it was simple log28-log24, to give o.07, so the rule u stated, what situation is it for???

 

[anishniroula]

wait i dont get it, why divide by 2?????? for ex: in oct/nov 2011 for lgT it was simple log28-log24, to give o.07, so the rule u stated, what situation is it for???

It is just co-incidence. The formula is highest value minus lowest value divide by 2. Not highest value minus mid value divide by two.

 

[Hassi123]

You could even subtract highest from actual value. For eg if its log 4 +-2, then for un you will do this : Log 6 - log 4

 

[anishniroula]

You could even subtract highest from actual value. For eg if its log 4 +-2, then for un you will do this : Log 6 - log 4

bro, i think we should divide it by two