HOW WAS PHYSICS PAPER 5 PPL ? HOW WAS YOUR EXAM ?

[histephenson007]

ok ppl i did a big mistake of error bars...
i plotted it on the y-axis which was for 'f' instead of ploting it on the x-axis which was was for 1/L....so my whole answers will be wrong related to errors...will they give me marks for error carried forword?????

They will give you e.c.f but u might lose more than 2 points for that error

 

[Gooners]

I used a blower for varying the wind speed but had no f**king idea how to calculate wind speed so i used d/t formula lol!
And i used a Iron nail to connect the rope to the table hence i got a safety precaution out of it tht was use of hammer can hurt bla bla bla so first gently hammer nail and after it is into the table a little remove ur hand of the nail and hammer forcefully
Also stated that use ear defenders in case balloon bursts!
I measured angle thru a protector as the trignometric method of lengths in my view had greater % uncertainity as u had to calculate 2 lengths and hence uncertainities add up!
Q2 answrs of mine were uncertainities of table
0.02 to 0.05 , gradient 139 +- 10
- u= 3.2 0r something x 10^-4 and uncertainity was 24%
radiu ws 1.12 x 10^-4 and uncertainity was 8%!!

 

[Gooners]

this is how exactly i drew...dont know how far iam correct?
i changed 'd' value to change 'v' v=d/t...then converted to v^2....
for each v^2 ,,, i measured angle tan...

I drew the same but i used a nail nd fan on the left side instead of the right as it was specified in the paper!! :/ cuz if u draw like that in the pic tanQ would not be inversley propotional to the v^2

 

[Asad Pirbhai]

this is how exactly i drew...dont know how far iam correct?
i changed 'd' value to change 'v' v=d/t...then converted to v^2....
for each v^2 ,,, i measured angle tan...

how come fan is pulling the balloon....fan is placed at wrong position.

 

[ousamah112]

this is how exactly i drew...dont know how far iam correct?
i changed 'd' value to change 'v' v=d/t...then converted to v^2....
for each v^2 ,,, i measured angle tan...

I placed the fan on opposite position as it was in the given diagram...

 

[angelgirl:)]

how come fan is pulling the balloon....fan is placed at wrong position.

its pushing it upwards... isnt it???

 

[aaditya menon]

did he have to give units for any value in the 2nd question? HOw may marks was it for?

 

[Gooners]

its pushing it upwards... isnt it???

------------WIND------->. BALLOON
This was shown in the diagram

 

[Gooners]

did he have to give units for any value in the 2nd question? HOw may marks was it for?

U u had to give units fr (u) I think. It was only 1 mrk I think...

 

[aaditya menon]

Urgh! damn, i forgot to find the units for it! SHIT SHIT SHIT! ****, it was so easy! URRRGHH!
I'm losing a mark there
and another coz i forgot to mention the gradient will be negative and won't pass through the origin.

Maybe a few here and there, hoping for atleast 25-26/30

 

[Asha Tabassum]

this is how exactly i drew...dont know how far iam correct?
i changed 'd' value to change 'v' v=d/t...then converted to v^2....
for each v^2 ,,, i measured angle tan...

u hav positioned the fan wrong....
with this arrangement ur result will come proportional bt they want inverse....

 

[Gooners]

Urgh! damn, i forgot to find the units for it! SHIT SHIT SHIT! ****, it was so easy! URRRGHH!
I'm losing a mark there
and another coz i forgot to mention the gradient will be negative and won't pass through the origin.

Maybe a few here and there, hoping for atleast 25-26/30

Which graph did u draw in analysis part????
Tan Q was inversely propositional to v^2 so we had to draw a graph of tanQ against 1/v^2 nd it was passing thru origin with positive gradients as for direct proportional graph*????? Negative gradient nd not passing thru origin????:S:S:S:S

 

[ousamah112]

Which graph did u draw in analysis part????
Tan Q was inversely propositional to v^2 so we had to draw a graph of tanQ against 1/v^2 nd it was passing thru origin with positive gradients as for direct proportional graph*????? Negative gradient nd not passing thru origin????:S:S:S:S

i wrote that graph of tan O against 1/v2 is plotted and if the line is straight with origin as one point thn relationship is confirmed..

 

[Gooners]

i wrote that graph of tan O against 1/v2 is plotted and if the line is straight with origin as one point thn relationship is confirmed..

Yes I wrote the same and almost All of my friends(intelligent) did so too.

 

[ousamah112]

Yes I wrote the same and almost All of my friends(intelligent) did so too.

the whole thng will make sense only in this case...

 

[Ahmed Tariq]

Urgh! damn, i forgot to find the units for it! SHIT SHIT SHIT! ****, it was so easy! URRRGHH!
I'm losing a mark there
and another coz i forgot to mention the gradient will be negative and won't pass through the origin.

Maybe a few here and there, hoping for atleast 25-26/30

The gradient was positive, and in Q1, it WAS passing through the origin.

 

[angelgirl:)]

u hav positioned the fan wrong....
with this arrangement ur result will come proportional bt they want inverse....

ohhhhhhhhhhhh yes....
hmmmm
its ok now i cant do anything....

 

[Jasmine1204]

And measured what? The resistance?

Well..u could vary the resistance using the rheostat and thus, vary the wind speed for various results....thats how you vary the wind speed kiddo...

 

[Jasmine1204]

ahahah how do current and Emf value help xP

To vary the wind speed...

 

[Jasmine1204]

hey thats the seed of the rotation fan not the wind speed :S?or is it the same thing?

nope..not same