Qualification > Sciences
IGCSE PHYSICS DOUBTS HERE !!!!
~ Miss Relina ~:
--- Quote from: Ari Ben Canaan on March 23, 2011, 01:32:45 pm ---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.
--- End quote ---
Thanks again :)
~ Miss Relina ~:
--- Quote from: $~SauD~$ on March 23, 2011, 05:19:13 pm ---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.
--- End quote ---
Thanks but plz in Summer 2005
why it is not A isn't A variable resistor too
SauD~:
--- Quote from: Relina on March 23, 2011, 10:51:19 pm ---Thanks alot but what is the relation By the way weight and energy is there is a rule or smthing ???
--- End quote ---
weight = force (unit for both are Newtons)
energy = work done (unit is Joules for both)
Work done = force x distance
SauD~:
--- Quote from: Relina on March 23, 2011, 11:13:34 pm ---Thanks but plz in Summer 2005
why it is not A isn't A variable resistor too
--- End quote ---
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 ~:
--- Quote from: $~SauD~$ on March 24, 2011, 08:57:12 am ---weight = force (unit for both are Newtons)
energy = work done (unit is Joules for both)
Work done = force x distance
--- End quote ---
ahhhhhaaaaa omg i really forgot abt that Thanks u :D
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