IGCSE PHYSICS DOUBTS HERE !!!!

[~ Miss Relina ~]

2002 Summer

Copper = Conductor

Wood = insulator

Copper conducts the heat away quickly from the area around the paper straight to the far end. No burning of the paper.

Wood keeps the heat from being conducted away to the far end.... paper experiences significant burning on the wood side.

Thanks again

[~ Miss Relina ~]

Summer 2003
17 i forgot the method, b'because i had done this long back,

Summer 2007
21 is B because light rays bend(refract) when they move from 1 median to another,
As water is denser than air so the rays refract away from the normal ray.

30 is also B, as potentiometer requires 3 ways input so we eliminates A and D. About C its not correct as the current will flow through the wire because it has less resistant, and current always flow through the easiest path(less resistant) so B is correct.

Winter 2007
21 is B. It is because as B line is passing through center, if you cut the half of the above and fill it it the gap which the between of 2 trough, you will get the normal water line ( Sorry, i don't know how to explain, but this is my own theory and is Common sense )

Summer 2005
29 is D because as the voltmeter is always connected in parallel to the object whose voltage is to be measured.

32 is B. Its due to Variable resistor doesn't work in parallel.

Winter 2005
31 is A,
Current always flows through the easiest way, way which is of less resistance. So when S is closed, the current pass through the S part instead through resistor, so the brightness increases.

Thanks but plz in Summer 2005
why it is not A isn't A variable resistor too

[SauD~]

Thanks alot but what is the relation By the way weight and energy is there is a rule or smthing

weight = force  (unit for both are Newtons)
energy = work done (unit is Joules for both)

Work done = force x distance

[SauD~]

Thanks but plz in Summer 2005
why it is not A isn't A variable resistor too

I am not sure, but what i think is that for varying a current for a parallel lamp, potential divider is the best

[~ Miss Relina ~]

weight = force  (unit for both are Newtons)
energy = work done (unit is Joules for both)

Work done = force x distance

ahhhhhaaaaa omg i really forgot abt that Thanks u 

[~ Miss Relina ~]

can any one answer this

[Arthur Bon Zavi]

can any one answer this

The third one (by Jack) because as well as getting the time for 20 swings to occur, we get the time of one complete swing.

[SauD~]

ahhhhhaaaaa omg i really forgot abt that Thanks u 

Welcome

[~ Miss Relina ~]

guys i feel i am not totally confident abt the variable potential divider and the potential divider circuits and the thermal heat capacity (in question posted before plz help with these doubts

[~ Miss Relina ~]

oh i think my questions are too hard 

[elemis]

oh i think my questions are too hard 

No. Its just that its too difficult to explain such concepts via the internet.

Get your teacher/tutor to answer your doubts.

[SauD~]

oh i think my questions are too hard 

Oh, sorry
i didn't got any notification about this thread
I will reply sometime later, i am doing my business so i cannot multi task in subjects

[~ Miss Relina ~]

Oh, sorry
i didn't got any notification about this thread
I will reply sometime later, i am doing my business so i cannot multi task in subjects

no probs i'll be waiting 4 ur reply

[~ Miss Relina ~]

No. Its just that its too difficult to explain such concepts via the internet.

Get your teacher/tutor to answer your doubts.

well ofcourse i didn't understood them from my teacher that why i'm asking here
just if u can help with anylinks or youtube i will really appreciate it instead of explaining them

[~ Miss Relina ~]

i'll tryto post more easier questions for u guys to answer 
well, why when we drop 3 balls one aluminum,lead, wood from a bench which has same acceleration??
1.aluminum,lead
2.lead, wood
3.aluminum, wood
4.aluminum,lead, wood