As Physics Unit3 Discussion

[shoaeb]

viscosity decreases with increase in temperature
example oil when temperature is cold it has high viscosity doest flow tht well but when we heat it viscosity increases and it flows faster

you confused me with that :S..example oil when temperature is cold it has high viscosity doest flow tht well but when we heat it viscosity increases and it flows faster..?

 

[candy123]

you confused me with that :S..example oil when temperature is cold it has high viscosity doest flow tht well but when we heat it viscosity increases and it flows faster..?

what i mean is when oil is at room temperature viscosity is high
when it is heated in pan
and then poured into a bottle it has low viscosity
so when temperature is high viscosity is low
and when temprature is low viscosity is high
they are inversly proportioned
*viscosity relates ot a liquids stickiness tht is its resistance to flow

 

[candy123]

like it flows faster at high temperatures and slower and low temperatures - oil tht is or nay liqid for tht matter .

 

[shoaeb]

what i mean is when oil is at room temperature viscosity is high
when it is heated in pan
and then poured into a bottle it has low viscosity
so when temperature is high viscosity is low
and when temprature is low viscosity is high
they are inversly proportioned
*viscosity relates ot a liquids stickiness tht is its resistance to flow

so if the viscosity is high..then the liquid flows slowly?

 

[shoaeb]

like it flows faster at high temperatures and slower and low temperatures - oil tht is or nay liqid for tht matter .

thankyou so much..finally got it ..good luck with the paper

 

[candy123]

thankyou so much..finally got it ..good luck with the paper

good luck to you too and i jsut noticed my mistake

you confused me with that :S..example oil when temperature is cold it has high viscosity doest flow tht well but when we heat it viscosity increases and it flows faster..?

its viscosity decrease and flows faster sry
best of luck wiht ur paper

 

[shoaeb]

good luck to you too and i jsut noticed my mistake
its viscosity decrease and flows faster sry
best of luck wiht ur paper

the only thing i wanted to know..was about proportionality..if you told me that in the begining i wouldve understood everything .thanks aloot!! appreciate that.

 

[DANGERBP]

guyz the uncertinity !!! helpp !!
i dono nothin =/ !

 

[DANGERBP]

do we need to know how to measure a standin wave =/

 

[U stalking ME]

guyz the uncertinity !!! helpp !!
i dono nothin =/ !

1) Find the mean, eliminate the anomalie
2) uncertainity = (largest value - smallest value)/2
3) %uncertainity= (uncertanity/mean) x 100

 

[U stalking ME]

do we need to know how to measure a standin wave =/

yup

 

[xIshtar]

For uncertainty, this is the way I was taught.

If you have 3 values, for example: 14.7, 14.9, 15.1

To find the mean, it is (14.7 + 14.9 + 15.1)/3 = 14.9

Now to find the uncertainty, it's the highest - mean and then the mean - the lowest added together and divided by 2.

So, 15.1 - 14.9 = 0.2,
14.9 - 14.7 = 0.2

=> (0.2+0.2)/2 = 0.2
And thus it is 14.9 +/- 0.2 And thus the uncertainty is 0.2/14.9 * 100% = 1.34% (3sf) Hope that clears your problem up. ^^ Good luck to everyone today!

 

[xIshtar]

yup

Uhh, would you mind recapping on how to do that for me?

 

[DANGERBP]

yup

shit man you not serious !! =S
okay wat equations we need to know for tht ?i

 

[¦HaLo¦]

good luck ppl

 

[DANGERBP]

For uncertainty, this is the way I was taught.

If you have 3 values, for example: 14.7, 14.9, 15.1

To find the mean, it is (14.7 + 14.9 + 15.1)/3 = 14.9

Now to find the uncertainty, it's the highest - mean and then the mean - the lowest added together and divided by 2.

So, 15.1 - 14.9 = 0.2,
14.9 - 14.7 = 0.2

=> (0.2+0.2)/2 = 0.2
And thus it is 14.9 +/- 0.2 And thus the uncertainty is 0.2/14.9 * 100% = 1.34% (3sf) Hope that clears your problem up. ^^ Good luck to everyone today!

thank you so much ! but hey i asked ma friend n wat he said was when you find uncertinity you subtract highest - mean !
n then you mean - lowest .. n choose the one which is more as the uncertinity ? is that true too ?
thx again =p

 

[DANGERBP]

yup

haha you doin physics too =p !

 

[¦HaLo¦]

thank you so much ! but hey i asked ma friend n wat he said was when you find uncertinity you subtract highest - mean !
n then you mean - lowest .. n choose the one which is more as the uncertinity ? is that true too ?
thx again =p

dont u do highest value-lowest value/2 to get uncertanity idk wat u guys are doing .... :S

 

[DANGERBP]

dont u do highest value-lowest value/2 to get uncertanity idk wat u guys are doing .... :S

ahahhaha ! man me neither ! everyone i asked gave me a complete different way ! =p
am thinkin of givin up on it , this mark wont make much difference =p !

 

[xIshtar]

dont u do highest value-lowest value/2 to get uncertanity idk wat u guys are doing .... :S

We were told the examiners prefer it differently, my teacher went to a seminar or something, and told us that they wanted us to do it the way I showed.