ALL PHYSICS DOUBTS - POST HERE !!

[Ghost Of Highbury]

Um..can u explain..How is the difference 0.03?

find their respective resistance..and find the difference, it will be = 0.03 ohms.

[Vin]

08 Jun P6 Q2 b
thx

oohk .. i hav a different method .. might get complicated but fairly accurate ..

first of all the resistors are all the same .. so v can assume a specific resistance for each one .. say 2 ohm ..

For circuit  1 ==> total resistance ..
1/2 + 1/2 + 1/2 = 3/2

so = 2/3 = 0.667 ohm..

For Circuit 2 ==> total res. ..
1/4 +  1/2  =  3/4  

so = 4/3  =  1.33 ohm ..

therefore it is clear tht circuit 2 double of 1 ..

[Vin]

Not really sure. A friend of mine mailed the photos to me. He said something like "Federal Physics."  Never heard of it from anyone before.....

ohh i see .. neither did i ..

[Fastal]

oohk .. i hav a different method .. might get complicated but fairly accurate ..

first of all the resistors are all the same .. so v can assume a specific resistance for each one .. say 2 ohm ..

For circuit  1 ==> total resistance ..
1/2 + 1/2 + 1/2 = 3/2

so = 2/3 = 0.667 ohm..

For Circuit 2 ==> total res. ..
1/4 +  1/2  =  3/4  

so = 4/3  =  1.33 ohm ..

therefore it is clear tht circuit 2 double of 1 ..

where does it say each resistor is 2 ohms?arent we supposed to use the calculated value fram a(ii)

[Vin]

where does it say each resistor is 2 ohms?arent we supposed to use the calculated value fram a(ii)

its not mentioned the resistors are of 2 ohms .. we can assume 2 ohms because they are the same ones being used

however u might use the readings given .. jus fo ur understanding i hav used 2 ohms ... DONT GET CONFUSED!!

I ASSUMED JUS FOR THE SIMPLE REASON because THEY R SIMILAR .. ITS MENTIONED .. IF NOT NEVER ASSUME STUFF !! 

[The Golden Girl =D]

I know they aren't the best pictures around there but they might help those looking for info on micrometers and vernier callipers...

 i saw how they do it in youtube.com  but how will the questions abt these two come ? ...... in other words , what will they ask us to do ?

thx in advance

[Vin]

 i saw how they do it in youtube.com  but how will the questions abt these two come ? ...... in other words , what will they ask us to do ?

thx in advance

they may give a situation and tell u to design an experiment or wat readings to tak or they might give a diagram and tell u to calculate the length ..

[The Golden Girl =D]

they may give a situation and tell u to design an experiment or wat readings to tak or they might give a diagram and tell u to calculate the length ..

it's still a bit hard for me to describe how i'll actually use it and take readings ...idk?!!? 

[bob]

HELP! This type of question keeps coming up and i never know what to write! the markscheme just says "clear explanation/diagram" n even though its just a one mark question i still wanna know what to write..PLEASE HELP!

Its question 1b from  physics m/j/08 paper 6

Q:The cylinder completely covers the marks on the metre rule. Describe, with the aid of
a diagram, how you would judge that the centre of the cylinder is directly above the
10.0 cm mark.

[Vin]

HELP! This type of question keeps coming up and i never know what to write! the markscheme just says "clear explanation/diagram" n even though its just a one mark question i still wanna know what to write..PLEASE HELP!

Its question 1b from  physics m/j/08 paper 6

Q:The cylinder completely covers the marks on the metre rule. Describe, with the aid of
a diagram, how you would judge that the centre of the cylinder is directly above the
10.0 cm mark.

hav a look at previous posts ..1 or 2 pages before ..

[Ghost Of Highbury]

Stick/Attach a pin to the 10.cm mark. place the center of the cylinder exactly on the pin. remove the pin

[Fastal]

Stick/Attach a pin to the 10.cm mark. place the center of the cylinder exactly on the pin. remove the pin

while removing the pin, wont there be errors?

[Ghost Of Highbury]

wat errors? once the cylinder is placed, the pin can be removed...or if u have doubts, let it be dere and carry on the experiment.

[Fastal]

wat errors? once the cylinder is placed, the pin can be removed...or if u have doubts, let it be dere and carry on the experiment.

wont the pin have weight?
how would you remove the pin? are we making a whole in the cylinder and ruler. i dont get it.

[Ghost Of Highbury]

the pin is very lightweight compared to the metal cylinder...its extremely thin. the optic pin or thinner than that..

check the image. with the weight of the metal cylinder, it wud be easy to just slip it out with no movements from the cylinder.