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

[Sandhya Mahat]

gradient was 144+/-4 wasn't it?
And one of my % uncertainty came like 17.5% nd i wrote 18%, it it correct?
anyone plz write the answers of the second question

 

[extremeranger]

gradient was 144+/-4 wasn't it?
And one of my % uncertainty came like 17.5% nd i wrote 18%, it it correct?
anyone plz write the answers of the second question

how about you read the whole thread first

 

[RAFFAY]

It was easy but the shitty thing that i didnt design a laboratory experiment, i designed the w people on it. i think i m gonna screwed

I had also done this but changed this during last five minutes lol!!!!!!!!

 

[RAFFAY]

gradient was 144+/-4 wasn't it?
And one of my % uncertainty came like 17.5% nd i wrote 18%, it it correct?
anyone plz write the answers of the second question

my gradient was 145.3 and uncertainty 6.6.......am I gone???

 

[Sandhya Mahat]

my gradient was 145.3 and uncertainty 6.6.......am I gone???

I got 143.75 so i wrote 144.. dnt know

 

[princesskt]

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

i got similar

 

[earthling]

my gradient was 145.3 and uncertainty 6.6.......am I gone???

gradient was 144+/-4 wasn't it?
And one of my % uncertainty came like 17.5% nd i wrote 18%, it it correct?
anyone plz write the answers of the second question

Which variant is this???

 

[RAFFAY]

52

 

[ying27kia]

not even...explain

u=p(pie)r^2
p is kgm^-3
r is m
so u is kgm^-1 .
I might be wrong tho

 

[ying27kia]

gradient was 144+/-4 wasn't it?
And one of my % uncertainty came like 17.5% nd i wrote 18%, it it correct?
anyone plz write the answers of the second question

yes
whole number is correct

 

[pspwxpfan]

Used the following method to approximate the speed of the wind. Thoughts?

Position the fan behind a smooth stainless steel surface and place a light object on the surface at a starting position. Use a stopwatch to measure the time taken for it to travel a fixed distance from the starting position. Use v=d/t to estimate speed.

Since all we were doing was proving that k is constant for different values of v^2 and tan(Q), i think an approximate should do..
But as i was typing this post, i just realized a light object can fly away >

A friend used a CRO. Hows that?

 

[extremeranger]

u=p(pie)r^2
p is kgm^-3
r is m
so u is kgm^-1 .
I might be wrong tho

u didnt hav to calculate units for this ques
it was the previous ques

 

[m.r92]

i used a hot-wire anemometer

 

[sasukeuchiha]

I connected voltmeter and ammeter to the fan.

LIKE A BOSS

me too. and a rheostat as well.. to keep current constant.

 

[vampire fairy]

in the (v) question in no.2 dont u halve the percentage uncertainty that u get before?

 

[Talha]

Lol guys u didnt had to think so much on how to measure wind speed.. i just wrote that we'll use an electronic fan (just like the electronic balance) that has a digital reading showing u the fan speed!

 

[Arham93]

i drew a table fan...connected to a signal generator and a variable resistor.....
in additional detail s i wrote to find diameter with help of meter rule>3 different place and find average and find the radius then use the formula w=2(pi)f and rw to find the speed of the fan.....do it in non windy environment so the speed of the fan will be the speed of the wind......is this rite way???......i tink i m screwed

 

[ying27kia]

okay

u didnt hav to calculate units for this ques
it was the previous ques

f=(1/2L)(T/u)^1/2
f is HZ or s^-1
T is kgms^-2
L is m
u will get u=kgm^-1
see

 

[extremeranger]

okay

f=(1/2L)(T/u)^1/2
f is HZ or s^-1
T is kgms^-2
L is m
u will get u=kgm^-1
see

oo ahh nice nice

 

[angelgirl:)]

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?????