Phys practical help .. urgent

[Gooners]

Guyz in physics practical Q2.... We find 2 values of K and we are asked to state if the law given in Q actually holds or not ... How do we show it from 2 values of K ???
Kindly help urgently!!!

 

[hancock]

You can compare the values and if they differ by 10% or more then, the theory is not supported. otherwise, it is

 

[Hussain Rizvi786]

k1 - k2 / k avarage

 

[confused123]

k1 - k2 / k avarage

and tell me again how to take log in some pst ppr questions..:/

 

[Natashakhan]

k average means k1 +k2/2 ??
and thn k1-k2 over this value?

 

[leosco1995]

k average means k1 +k2/2 ??
and thn k1-k2 over this value?

You don't take out k(average).

You do this:

(large k value - smaller k value) / larger k value

And * by 100 to get the %.

 

[Natashakhan]

and if % is greater than 20 then relation dsnt supprt ryt? :S
ahh um cnfused :/

You don't take out k(average).

You do this:

(large k value - smaller k value) / larger k value

And * by 100 to get the %.

 

[leosco1995]

and if % is greater than 20 then relation dsnt supprt ryt? :S
ahh um cnfused :/

Look. Suppose your values of k come out to be 1.04 and 1.56. This is how you would work it out:

(1.56 - 1.04) / 1.56
= 33%

You would write something like this as the conclusion:

The results suggest that, within the limits of experimental accuracy, X and Y are proportional as the calculated values of k are within 10 (or 20)% of each other.

 

[Natashakhan]

they are not within 20 % ?
33% is like more t han 20 :S

 

[iceman]

so we should take within 20% or 10%??

 

[ibadsiddiqi]

Well we've been told that if its not within 10% then they are not proportional or that the theory does not hold

 

[raamish]

hmm guys need help in significant figures:

my readings are:
V/V:8.0 V
I/A:0.32
P/W:2.56
R/ohm:25.0
R4/ohm: 3.9*10^5

Guys please check my readings and tell me how many significant figures i should give for each reading

 

[raamish]

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_34.pdf

2f(ii) Are u talking about this part. do we have to use the formula mentioned above to do this?

 

[anonymous123]

cant u just use ratio proportion and find out??

 

[raamish]

cant u just use ratio proportion and find out??

http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w11_qp_34.pdf

2f(ii) Are u talking about this part. do we have to use the formula mentioned above to do this?

Know the answer for this?

 

[anonymous123]

i was talking about that...cant do that with ratio?

 

[Shouly]

im SOOOOOO lost about tomorrow lol , i have paper 32 . I heard its going to be mechanical and our teacher didnt give us but a totla of like 4 lab expirements allll year. ANY LIMITATION AND IMPROVEMENT TIPS FOR THE MECHANICAL EXAMS? AND TIPS IN GENERAL PLEASE.

 

[mustafa arif02]

hey what is the correct way...its too confusing too many ideas for that K value

 

[Khalifa]

I'm confused too. I read somewhere that it should be

[ (Larger K minus smaller K) / larger K ] multiPlied by 100

And if it was within +\- 10% of the PERCENTAGE UNCERTAINTY we calculated earlier, ONLY then it will be propotional.
Is this correct or should the answer be that it is LESS THAN 10% to be proportional correct?
Please help ASAP