How was the Physics P21?

[arlery]

Yeah but I don't take chemistry. =S

 

[solidboy123]

guys guys the the electricity first part answer was 0.67 and then the max current was 3 and min was 2. The graphs both were curve. U all think the paper was easy but infact it was tough. I scored in oct nov 3 varient as 51 but i am sure that i will get 45 -49 in this one and the threshold will be at max 40

 

[arlery]

Thanks for boosting my confidence. Now I feel so much better.

 

[solidboy123]

u are welcome

 

[arlery]

What do you think the threshold will be?

 

[solidboy123]

36-40

 

[arlery]

I hope so. What was the answer for Electricity's last part, the q. about why parallel circuit is better.

 

[solidboy123]

less current across the lamp so less chance of the lamp being blowed or fused

 

[arlery]

what about all components are independent of each other in a parallel circuit?

 

[solidboy123]

its true but that doesnt benefit us right we dont have to use a variable resistor

 

[ibrahimovais]

Man how do you Find thE % uncetainty of the area...was it 2(uncetainty of the diameter/0.38) *100

 

[solidboy123]

the area formula is diameter diveided by 2 and into pie and the uncertainity will be uncertainy of diameter into 2/radius

 

[jumana94]

Hey! the maximum current wasn't 3....every1 got it as 2...the minimum current everyone had a value...
@arley, i did just like u in the question about why is it beneficial in the electricity question, i talked abt its parallel & not being affected...
and the uncertinity dude?! wat the hell are u talkin abt?? we just find the uncertinity of the diameter!
so i did it as the percentage uncertinity of Resistivity + length + diameter !! cz the only varrying thing in the area is the diameter! : S
Huh! & they say it was easy! it soo wasnt! Everyone has an answer!!

 

[arlery]

the area formula is diameter diveided by 2 and into pie and the uncertainity will be uncertainy of diameter into 2/radius

Yeah that's how I did it but in a slightly different way.

 

[ullahabd]

dude u find the uncertainty of area by uncertainty of diameter/diameter times 2....not ude u find the uncertainty of area by uncertainty of diameter/radius times 2

 

[arlery]

I did it using radius by using the formula pi r^2 and then found the uncertainty.