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

[jackrabbit]

Btw what were your percentage uncertainties? I got like 1.96% and 0.8%

 

[WhereAmazingHappens]

how the hell did you measure wind speed ? what instrument ? and wat did u use to vary wind speed

u have to use a tabletop fan with variable speeds

 

[DragonCub]

how the hell did you measure wind speed ? what instrument ? and wat did u use to vary wind speed

how did u measure the wind speed? i dont think it was in our syllabus

I used the wind vane. It's not a very high-tech apparatus but it is useful. The wind vane has a rotating part that revolves when wind blows. So I think if the wind vane is light enough, its rotating linear speed should be the same as wind speed. Here what needs to be recorded is something like time taken for 20 complete revolution. Use the time to calculate the speed.

 

[Damn]

y

Um I just wrote, do repeats of the measurements of lengths using a ruler, take averages, keep temperature, pressure (and hence volume of helium constant) by filling it to a set pressure level using a pressure gauge to measure pressure, keep length of string constant, and for safety I had noo idea, I was just like be careful not to get ur fingers cut by the blades of the fan LMAO, I mean whos gonna stick their fingers in the rotating blades of a fan



Um yeah You dont have to draw, you could just as well state it

ya i wlmost wrote the same stuff but what abt method of observation?

 

[Damn]

I used the wind vane. It's not a very high-tech apparatus but it is useful. The wind vane has a rotating part that revolves when wind blows. So I think if the wind vane is light enough, its rotating linear speed should be the same as wind speed. Here what needs to be recorded is something like time taken for 20 complete revolution. Use the time to calculate the speed.

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

 

[DragonCub]

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

I mean the linear speed of the wind vane. I put it between the fan and the balloon. So the wind from the fan can make it rotate, and its linear speed is very close to that of the wind.

 

[chemistrylover]

guys wat did u write for the safety precaution??

 

[ying27kia]

i g

Btw what were your percentage uncertainties? I got like 1.96% and 0.8%

ot 20% and 10%

 

[cuppycake]

Um I just wrote, do repeats of the measurements of lengths using a ruler, take averages, keep temperature, pressure (and hence volume of helium constant) by filling it to a set pressure level using a pressure gauge to measure pressure, keep length of string constant, and for safety I had noo idea, I was just like be careful not to get ur fingers cut by the blades of the fan LMAO, I mean whos gonna stick their fingers in the rotating blades of a fan



Um yeah You dont have to draw, you could just as well state it

you could use those ear defenders in case the balloon burst..

 

[cuppycake]

Btw what were your percentage uncertainties? I got like 1.96% and 0.8%

i got the same values dude...but most ppl are getting uncertainties like 20 sth wtf!

 

[vita199]

i got % uncertainity of 27% and 8%..and what was length for the steel wire???i got 1.12*10-4!!

 

[asifaadi]

guys wat was the equation for the first question? and wat was the second question abt? please reply asap

 

[extremeranger]

My answers:
Gradient: 142 +- 8
2nd ques: 3.72x10^-4 ---- units: N/Hz^2 m^2
3rd ques: 21.3%
4th ques: forgot
5th ques: 10.7%

Your 3rd ques value should be halved to get the 5th ques value

 

[extremeranger]

and what did u guyz get for uncertainties for your tables...i got like +/- 0.02 - 0.04

 

[ali_6193]

http://xat.com/paper62stats can discuss paper here come on this link and discuss p2 and p5
physics its kinda chat window

 

[angelicsuccubus]

no.. i attached a weight to balloon.. it was stated that a small helium balloon is provided...

lol if you attached a weight to it, the balloon would sink..........

 

[angelicsuccubus]

and what did u guyz get for uncertainties for your tables...i got like +/- 0.02 - 0.04

same .. but i had them up to 3sf

 

[reh2300]

hey which variant r u guys talking about?

 

[angelicsuccubus]

i used fan.. and speed of fan was the speed of wind... i couldnt think of anything else..:s

same .. I tried to think of a wind guage .. but I couldnt remember the name so I used a fan with various speeds

 

[angelicsuccubus]

And measured what? The resistance?

ahahhahahaha!